ASTM D789, D4878 Relative Viscosity of Polyamide

ASTM D789, D4878 Relative Viscosity of Polyamide

Determination of Relative Viscosity of Polyamide (PA) by Brookfield Method is done by ASTM D789, D4878. As the flow behavior depends on a polymer's molecular weight distribution, the determination of relative viscosity is a sensitive method for material characterization.

    Scope:

    ASTM D789, D4878 tests are used to determine the relative viscosity of polyamide (PA) by Brookfield method. The viscosity of a substance is its resistance to flow and change shape at a given shear rate. The flow behavior of a substance indicates an indirect measure of material consistency and quality. To ensure good quality, the product consistency of the material needs to be the same in different batches. During molding, the viscosity of a polymer may get reduced due to degradation and reduced molecular weight. One can determine the change by comparing the original polymeric resin with the finished product. 

    Test Procedure:

    For the ASTM D789 and ASTM D4878 test method an 8-ounce bottle with a screw cap is filled with 22.0 +/- 0.01 grams of polymer, and to this, formic acid is added. The whole system is agitated using a shaker to dissolve the sample polymer, and then the bottle is placed in a bath maintained at 25 °C for at least 1 hour. The resulting solution is placed in a Brookfield Viscometer where the spindle is set at a suitable speed according to the viscosity of the solution. This instrument measures the force to turn the spindle at a given rate in the solution and then determines the viscosity of the solution.  

    The video given below explains the test procedure

    The video given below explains how to choose the spindle and speed of the viscometer

    Specimen size:

    About 22 grams of polymer.

    Data:

    Relative Viscosity in this method is calculated by dividing the absolute viscosity of the polymer/formic acid solution by the absolute viscosity of the formic acid used.

    Rv = relative viscosity of the polymer-formic acid solution.

    Mf = absolute viscosity of formic acid.

    Ms = absolute viscosity of the polymer-formic acid solution.
    Rv = (Ms/Mf)

    Conclusion:

    ASTM D789 and ASTM D4878 is a standard test method for determination of relative viscosity of polyamide (PA).

    OUR SERVICES

    Core Materials Testing Services

    Metrology

    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have already delivered 10000+ Material Test results to top companies

      Send us a request

        Process for testing
        •  

          STEP 01

          You share material and testing requirements with us

        •  

          STEP 02

          We ensure your sample pick-up in an ensured manner

        •  

          STEP 03

          We deliver test report to your inbox

          Let’s work together!

          Share your testing requirements with us and we will be happy to assist you.

          ddd Just share your testing requirements and leave the rest on us!
          • Free, no-obligation consultation
          • Guaranteed confidentiality
          • Quick turnaround time
          • Hassle-free process

            ddd

            Let us combine our capabilities to achieve success!!

              idea icon
              Want to connect with an expert before you leave?