{"id":10232,"date":"2026-08-01T12:40:37","date_gmt":"2026-08-01T12:40:37","guid":{"rendered":"https:\/\/fsxchemical.com\/?p=10232"},"modified":"2026-08-05T06:52:33","modified_gmt":"2026-08-05T06:52:33","slug":"comment-comparer-les-methodes-dessai-de-la-viscosite-des-epaississants-utilises-dans-limpression-textile","status":"publish","type":"post","link":"https:\/\/fsxchemical.com\/fr\/blog\/how-to-compare-textile-printing-thickener-viscosity-test-methods\/","title":{"rendered":"Comment comparer les m\u00e9thodes d'essai de la viscosit\u00e9 des \u00e9paississants utilis\u00e9s dans l'impression textile"},"content":{"rendered":"\n<p class=\"wp-block-wd-paragraph wd-512cd3aa\">Technical Guide Viscosity Testing &amp; Supplier Comparison Updated July 2026 Direct Answer<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b8afa533\">Textile printing thickener viscosity values can only be compared when the product form, solution concentration, temperature, instrument, spindle or rotor, rotational speed, sample container, preparation method, hydration time and measurement time are consistent. A value measured at 1% concentration using a Brookfield rotational viscometer cannot be compared directly with a 2% result obtained using another instrument or an unspecified method. Viscosity should first be matched under controlled laboratory conditions and then confirmed through an application or production trial.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-20a96e0f\">Same Number<br>\u2260<br>Same Product<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-924889ee\">For many textile printing thickener solutions and pastes, the reported result is an <strong>apparent viscosity under a defined measurement condition<\/strong>. If the concentration, spindle, speed, temperature or preparation method changes, the reading may also change even when the product itself has not changed.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-930a5d49\">Understanding the Result<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-91de12e8\">What Does a Thickener Viscosity Number Actually Mean?<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a92fad37\">A viscosity result describes resistance to flow under the conditions used during the test. It does not describe the complete printing performance of the product.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a20830b7\">Many CMC, CMS, sodium alginate and printing-paste systems show non-Newtonian behavior. Their apparent viscosity may change when the applied shear condition changes. ASTM D2196 therefore distinguishes between a viscosity value at one rotational speed and broader characterization using multiple speeds, shear thinning and viscosity recovery.<sup><a href=\"#fsx-visc-ref-2\">[2]<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-388d1ce4\">In practical terms, a paste may flow more easily while it is being mixed, pumped or forced through a screen, and then recover body after the applied force is reduced. These rheological characteristics affect paste transfer, pattern definition and spreading after printing. Textile-printing research has shown that rheological behavior is linked to quality-determining print parameters.<sup><a href=\"#fsx-visc-ref-4\">[4]<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-81686c4d\"><strong>Viscosity is one part of rheology.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b013d97e\">Rheology considers how a material flows and deforms under different conditions. A single viscosity number does not fully describe shear thinning, thixotropy, yield behavior or viscosity recovery.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-36c278e9\">Minimum Comparison Data<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-987a9c32\">Ten Conditions Buyers Should Confirm<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-18f762cf\">A supplier viscosity value is useful only when the associated method is clear enough to reproduce.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Test Condition<\/th><th>Why It Matters<\/th><th>What the Buyer Should Request<\/th><\/tr><\/thead><tbody><tr><th>Product form<\/th><td>Powder, flake and liquid products may use different preparation and control methods.<\/td><td>Confirm whether the test is performed on the supplied product or on a prepared solution.<\/td><\/tr><tr><th>Concentration<\/th><td>Polymer-solution viscosity can change substantially with concentration.<\/td><td>Confirm the percentage and whether it is w\/w, w\/v, dry basis or as-supplied basis.<\/td><\/tr><tr><th>Temperature<\/th><td>Viscosity is temperature dependent.<\/td><td>Record the sample temperature, such as 25\u00b0C.<\/td><\/tr><tr><th>Instrument<\/th><td>Different instrument designs and geometries may not generate directly equivalent results.<\/td><td>Record the manufacturer and instrument model.<\/td><\/tr><tr><th>Spindle or rotor<\/th><td>Spindle geometry influences the applied measurement condition.<\/td><td>Record the exact spindle, rotor or measuring geometry.<\/td><\/tr><tr><th>Rotational speed<\/th><td>Non-Newtonian samples may give different apparent viscosity at different RPM.<\/td><td>Record the RPM or defined shear rate.<\/td><\/tr><tr><th>Container and volume<\/th><td>Container diameter, sample volume and boundary conditions can influence rotational-viscometer readings.<\/td><td>Record the container type and minimum sample volume.<\/td><\/tr><tr><th>Preparation method<\/th><td>Mixing sequence, agitation, water addition and dispersion affect hydration and air incorporation.<\/td><td>Record mixing time, speed, order of addition and equipment.<\/td><\/tr><tr><th>Hydration and rest time<\/th><td>Some polymer solutions continue developing viscosity after initial mixing.<\/td><td>Record the defined hydration, resting and deaeration period.<\/td><\/tr><tr><th>Reading time<\/th><td>The indicated value may change before the sample reaches a stable or specified test condition.<\/td><td>Record the measurement duration or defined end condition.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-05978804\">AMETEK Brookfield specifically advises using the same instrument, spindle, speed, container, temperature and test time when viscosity data must be compared.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-01a366b1\">Solution Preparation<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-8b81d520\">Why Concentration Must Be Defined Precisely<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-85648372\">A statement such as \u201cviscosity at 1%\u201d is incomplete unless the concentration basis is defined. For a 1% w\/w laboratory solution with a total mass of 100 g, the usual calculation is:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Target Concentration<\/th><th>Dry Product<\/th><th>Water<\/th><th>Total Solution<\/th><\/tr><\/thead><tbody><tr><th>1% w\/w<\/th><td>1.00 g<\/td><td>99.00 g<\/td><td>100.00 g<\/td><\/tr><tr><th>2% w\/w<\/th><td>2.00 g<\/td><td>98.00 g<\/td><td>100.00 g<\/td><\/tr><tr><th>5% w\/w<\/th><td>5.00 g<\/td><td>95.00 g<\/td><td>100.00 g<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-86f0c34f\"><strong>Do not assume that every \u201c1%\u201d method means 1% w\/w.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-db7d503e\">Some documents may use weight per volume, dry basis or an internal preparation method. Liquid digital printing paste may also be tested as supplied or after dilution. The calculation basis should be stated before results are compared.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-916ecd66\">Example Comparison<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-ace16eb4\">Why Two Identical Numbers May Not Be Comparable<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7e6a8071\">SUPPLIER A<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-38a103de\">50,000 mPa\u00b7s<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-59aa71cb\">1% w\/w solution, 25\u00b0C, Brookfield RV instrument, Spindle No. 7, 20 RPM, defined hydration and reading time.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1182d4e4\">SUPPLIER B<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3887ab14\">50,000 mPa\u00b7s<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d3f33c90\">2% solution, NDJ instrument, rotor and speed not stated, temperature and preparation method not stated.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3c4a19cc\"><strong>Conclusion:<\/strong> These values should not be treated as equivalent. The numerical result is the same, but the concentration and measurement conditions are not.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fbad3044\">The figures above are an illustrative comparison, not a product specification.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d13c41bb\">Instrument Conditions<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-01731c9a\">Instrument, Spindle, RPM and Container<\/h2>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-edb5eaa2\">Instrument Model<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a0862cf0\">\u201cBrookfield viscosity\u201d is not a complete method by itself. The instrument family, torque range and measuring geometry should be identified. An NDJ result should not automatically be treated as equivalent to a Brookfield result.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-492b119c\">Spindle or Rotor<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-14396c0f\">The spindle interacts with the sample and defines part of the measuring geometry. Changing the spindle can change the valid measurement range and, for non-Newtonian materials, the reported apparent viscosity.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-ab8324e1\">Rotational Speed<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ac7ad4ad\">A shear-thinning paste may show a lower apparent viscosity as rotational speed increases. The RPM must therefore be reported with the result.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-59a27842\">Container Geometry<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8afcf2e3\">Standard spindles are designed for specific container dimensions and sample volumes. Alternative containers may produce repeatable but different results.<sup><a href=\"#fsx-visc-ref-1\">[1]<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2abcb7d1\"><strong>Check the instrument torque or valid operating range.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-43423f93\">A reading outside the instrument manufacturer\u2019s recommended range should not be accepted merely because a viscosity number appears on the display.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-faa507cf\">Sample History<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-2c45b3fa\">Temperature, Hydration, Mixing and Air Bubbles<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-931bcff6\">Repeatable viscosity testing requires more than setting the instrument. The sample must be prepared and conditioned in a repeatable way.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the same water source or defined water quality<\/li>\n\n\n\n<li>Condition the raw sample before weighing<\/li>\n\n\n\n<li>Use the same order of product and water addition<\/li>\n\n\n\n<li>Use the same mixer, speed and mixing time<\/li>\n\n\n\n<li>Control the total preparation temperature<\/li>\n\n\n\n<li>Use the same hydration or resting period<\/li>\n\n\n\n<li>Avoid or remove trapped air before measuring<\/li>\n\n\n\n<li>Measure within the same defined time window<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8388609c\">Brookfield guidance notes that the sample, container and spindle should be temperature conditioned, and that air should not be trapped around the spindle during immersion.<sup><a href=\"#fsx-visc-ref-1\">[1]<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-351c100d\"><strong>Water quality can become a hidden variable.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-da4224a6\">When a supplier and buyer prepare the same polymer with different water hardness, salt content, pH or temperature, the solutions may not hydrate or behave in exactly the same way. A controlled comparison should use the same water condition wherever possible.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7ceeb9c7\">Single-Point vs Multi-Speed<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-2986dda8\">When One Viscosity Reading Is Not Enough<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4147310f\">A single-point viscosity result can be useful for routine batch control when the method is fixed. It does not, however, fully describe how a non-Newtonian printing paste behaves at different shear conditions.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a37ff332\">ASTM D2196 explains that measurements at two or more rotational speeds provide better characterization of a non-Newtonian material than one speed alone. Increasing- and decreasing-speed measurements can also be used to examine shear thinning, thixotropy and viscosity recovery. <sup><a href=\"#fsx-visc-ref-2\">[2]<\/a><\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-f698ee70\">Single-Point Test<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e21bbec5\">Useful for routine specification control when concentration, temperature, instrument, spindle, RPM and reading time are fixed.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fast for batch comparison<\/li>\n\n\n\n<li>Easy to include on a COA<\/li>\n\n\n\n<li>Limited information about shear behavior<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-ba631ae3\">Multi-Speed Test<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e1cccf70\">Useful when the buyer needs to understand how the paste responds as the applied shear condition changes.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Shows apparent viscosity across speeds<\/li>\n\n\n\n<li>Can indicate shear-thinning behavior<\/li>\n\n\n\n<li>May help explain differences in screen running<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e5672785\"><strong>Do not invent a universal RPM sequence.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0d1e6c22\">The chosen speeds must fit the instrument, spindle, product range and purpose of the test. A supplier method should be reproducible, but it does not need to be identical for every product family.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3db4ad51\">Product-Specific Boundaries<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-90351cbe\">CMC, CMS, Sodium Alginate and Digital Paste Require Different Checks<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Product Route<\/th><th>Important Preparation Checks<\/th><th>Important Comparison Boundary<\/th><\/tr><\/thead><tbody><tr><th>CMC<\/th><td>Concentration, degree of substitution, mixing, hydration, solution stability and test temperature.<\/td><td>CMC grades with similar viscosity may differ in purity, substitution level and application behavior.<\/td><\/tr><tr><th>CMS<\/th><td>Powder or flake form, dispersion sequence, hydration method, concentration and process-specific preparation.<\/td><td>Reactive, disperse and specialty CMS routes should not be compared solely by one viscosity number.<\/td><\/tr><tr><th>Sodium Alginate<\/th><td>Stock-paste concentration, hydration, solution smoothness, temperature and defined spindle-speed method.<\/td><td>HV, MV and LV describe selection routes, not universal quality rankings.<\/td><\/tr><tr><th>Digital Printing Paste<\/th><td>Powder or liquid form, dilution or dosage basis, pretreatment recipe and as-supplied versus prepared-product testing.<\/td><td>A liquid digital paste result cannot be compared directly with a prepared powder-thickener solution without a defined basis.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d4b1687a\">For a broader comparison of the four routes, review the <a href=\"\/blog\/cmc-vs-cms-vs-sodium-alginate-vs-digital-printing-paste\/\">CMC, CMS, sodium alginate and digital printing paste selection guide <\/a>.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8081f34f\">Supplier Documentation<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-3f5023cc\">How to Read Viscosity Data on a TDS or COA<\/h2>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-134dfbc9\">TDS<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8ebe2bda\">A Technical Data Sheet commonly presents a typical or reference viscosity range together with product and application information.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check concentration<\/li>\n\n\n\n<li>Check temperature<\/li>\n\n\n\n<li>Check instrument and spindle<\/li>\n\n\n\n<li>Check whether values are typical or guaranteed<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-54ae313d\">COA<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c3ebb332\">A Certificate of Analysis should relate to a specific batch and report the applicable batch-test result or acceptance status.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check batch number<\/li>\n\n\n\n<li>Check test date where available<\/li>\n\n\n\n<li>Check method reference<\/li>\n\n\n\n<li>Confirm that the result belongs to the supplied grade<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-69bbbe1d\"><strong>A viscosity number without a method is incomplete.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-dcb5dc2b\">Ask the supplier for the missing test conditions before comparing specifications or rejecting a candidate sample.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-92750a4f\">Application Boundary<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-58685171\">What Laboratory Viscosity Can and Cannot Confirm<\/h2>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-32c76fe3\">It Can Help Confirm<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Whether two samples are close under one defined method<\/li>\n\n\n\n<li>Whether a production batch falls inside a control range<\/li>\n\n\n\n<li>Whether viscosity development is stable over a defined time<\/li>\n\n\n\n<li>Whether the current and candidate products require different dosage<\/li>\n\n\n\n<li>Whether further application testing is reasonable<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-30dc74c8\">It Cannot Confirm Alone<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Color yield after fixation<\/li>\n\n\n\n<li>Edge definition and pattern sharpness<\/li>\n\n\n\n<li>Fabric penetration<\/li>\n\n\n\n<li>Background cleanliness<\/li>\n\n\n\n<li>Wash-off performance<\/li>\n\n\n\n<li>Fabric handle<\/li>\n\n\n\n<li>Digital-print bleeding or fastness<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ab918931\">The viscosity test is therefore a screening and quality-control tool, not a substitute for a controlled printing trial.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0a50959b\">Buyer Workflow<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-40c7428c\">Six Steps for Comparing Two Thickener Samples<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b6b7d774\">STEP 01<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-538eac27\">Collect the Methods<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c5be09a4\">Obtain both TDS documents and identify concentration, temperature, instrument, spindle, RPM and preparation method. STEP 02<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-2a07380a\">Choose One Method<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-061a2ef0\">Select a method that both samples can be tested under without changing the intended product form or application route. STEP 03<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-e0578136\">Prepare in Parallel<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-94330ebb\">Use the same water, equipment, batch size, order of addition, mixing time and hydration period. STEP 04<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-03b6b34d\">Measure Consistently<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4714ee71\">Use the same instrument setup, container, temperature and defined reading time for both samples. STEP 05<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-02c40355\">Run the Application Trial<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a2e5c2e1\">Compare paste preparation, screen or pretreatment behavior, color, definition, wash-off, handle and production stability. STEP 06<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-30020c55\">Confirm the Supply Range<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-eaddcb86\">Agree on the grade, test method, specification range, batch documentation and commercial conditions before bulk purchase.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e7cfa8d9\">FSX Chemical Support<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-f9d93d89\">Sample Matching with a Defined Test Method<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-069e5ad3\">FSX Chemical can review available viscosity information for CMC, CMS, sodium alginate and digital printing paste before recommending an initial sample route.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c63599d7\">For a more useful review, buyers should provide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Current product name and supplier<\/li>\n\n\n\n<li>Current TDS or batch COA<\/li>\n\n\n\n<li>Target viscosity and acceptable range<\/li>\n\n\n\n<li>Concentration and preparation method<\/li>\n\n\n\n<li>Instrument, spindle and RPM<\/li>\n\n\n\n<li>Test temperature and reading time<\/li>\n\n\n\n<li>Printing process and fabric<\/li>\n\n\n\n<li>Main production issue<\/li>\n\n\n\n<li>Current dosage<\/li>\n\n\n\n<li>Expected monthly demand<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2ac2faa3\"><strong>Send the current sample when the written method is incomplete.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a9970985\">A physical sample, TDS and application information can provide a more practical starting point than a viscosity number copied from a supplier quotation.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6cd33ad7\">Buyer FAQ<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-012e449f\">Frequently Asked Questions<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e0a83945\">Can a 1% viscosity result be compared with a 2% result?<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-00b1f050\">No. Concentration has a major influence on polymer-solution viscosity. Both products should be tested at the same defined concentration before their numerical values are compared. Can Brookfield and NDJ viscosity values be compared directly?<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-be60bb3d\">Not automatically. Instrument design, rotor or spindle, speed, container and calculation method may differ. Direct comparison requires an internally validated correlation or testing both samples using the same method. Are cP and mPa\u00b7s the same viscosity unit?<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-79bcd371\">They are numerically equivalent for dynamic viscosity: 1 cP equals 1 mPa\u00b7s. However, matching units do not make two results comparable when their test methods differ. Why does viscosity decrease when RPM increases?<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-12cbde58\">Many textile thickener solutions and printing pastes are shear-thinning materials. Their apparent viscosity can decrease as the applied shear condition increases. The behavior should be confirmed using a defined multi-speed method. How long should a thickener solution hydrate before testing?<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4def1ca5\">There is no single hydration time suitable for every CMC, CMS, sodium alginate or digital paste product. Use the supplier\u2019s defined preparation method and apply the same time to all samples being compared. Does matching laboratory viscosity prove that two products are equivalent?<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-22b819d2\">No. Matching viscosity is an initial screening result. Product equivalence also depends on paste preparation, rheology, compatibility, color yield, definition, wash-off, handle and production stability. What should be written on a supplier TDS?<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-83dbbbae\">A useful viscosity entry should state the value or range together with concentration, temperature, instrument, spindle or rotor, rotational speed and any important preparation condition.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-bc304da4\">About This Technical Guide<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-26f6ccce\">Prepared by the FSX Chemical Technical Content Team for textile printing mills, chemical distributors, laboratory personnel and procurement teams comparing thickener specifications, samples and batch data.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1651d744\">FSX Chemical<br>Foshan Fushixin Polymer Fiber Co., Ltd.<br>Updated July 2026<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-dc9310e6\">Technical References<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-6f0033d2\">Measurement and Rheology References<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8d363d20\">These references provide general measurement and rheology context. Product specifications should follow the applicable supplier method, internal quality procedure and customer trial requirements.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>AMETEK Brookfield. DV1 Viscometer Operating Instructions. Guidance covers spindle and speed selection, container geometry, temperature conditioning and method consistency. <a href=\"https:\/\/www.brookfieldengineering.com\/-\/media\/ametekbrookfield\/product-manuals\/dv1-viscometer-operations-manual-m14-023.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">View official manual<\/a><\/li>\n\n\n\n<li>ASTM International. ASTM D2196, Standard Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational Viscometer. <a href=\"https:\/\/store.astm.org\/d2196-20r26.html\" target=\"_blank\" rel=\"noreferrer noopener\">View standard record<\/a><\/li>\n\n\n\n<li>International Organization for Standardization. ISO 3219-1, Rheology \u2014 Vocabulary and symbols for rotational and oscillatory rheometry. <a href=\"https:\/\/www.iso.org\/standard\/76032.html\" target=\"_blank\" rel=\"noreferrer noopener\">View ISO record<\/a><\/li>\n\n\n\n<li>\u201cRheological properties of printing pastes and their influence on quality-determining parameters in screen printing of cotton with reactive dyes using recycled polysaccharide thickeners.\u201d Carbohydrate Polymers. <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0144861709001362\" target=\"_blank\" rel=\"noreferrer noopener\">View research record<\/a><\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-da749d3e\">Compare Samples Under One Defined Method<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e88a6df9\">Send your current TDS, COA, sample or viscosity test method together with the printing process, fabric and target result. FSX Chemical can review a suitable CMC, CMS, sodium alginate or digital printing paste starting route before bulk purchase.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d86df8fe\"><a href=\"https:\/\/fsxchemical.com\/service\/samples-matching\/\">Request Sample Matching <\/a><a href=\"\/service\/request-a-quote\/\">Request a Quote<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>D\u00e9couvrez pourquoi les valeurs de viscosit\u00e9 des \u00e9paississants utilis\u00e9s dans l'impression textile ne peuvent pas \u00eatre compar\u00e9es sans tenir compte de la concentration, de la temp\u00e9rature, de l'instrument, de l'axe, de la vitesse, de la m\u00e9thode de pr\u00e9paration et de la dur\u00e9e de l'essai.<\/p>","protected":false},"author":1,"featured_media":10238,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-10232","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-guides"],"acf":[],"_links":{"self":[{"href":"https:\/\/fsxchemical.com\/fr\/wp-json\/wp\/v2\/posts\/10232","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fsxchemical.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fsxchemical.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fsxchemical.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fsxchemical.com\/fr\/wp-json\/wp\/v2\/comments?post=10232"}],"version-history":[{"count":1,"href":"https:\/\/fsxchemical.com\/fr\/wp-json\/wp\/v2\/posts\/10232\/revisions"}],"predecessor-version":[{"id":10237,"href":"https:\/\/fsxchemical.com\/fr\/wp-json\/wp\/v2\/posts\/10232\/revisions\/10237"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fsxchemical.com\/fr\/wp-json\/wp\/v2\/media\/10238"}],"wp:attachment":[{"href":"https:\/\/fsxchemical.com\/fr\/wp-json\/wp\/v2\/media?parent=10232"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fsxchemical.com\/fr\/wp-json\/wp\/v2\/categories?post=10232"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fsxchemical.com\/fr\/wp-json\/wp\/v2\/tags?post=10232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}