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.
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.
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
About 22 grams of polymer.
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)
ASTM D789 and ASTM D4878 is a standard test method for determination of relative viscosity of polyamide (PA).
ASTM E572 test method covers the analysis of stainless and alloy steels by Wavelength Dispersive X-ray Fluorescence Spectrometry (WDXRF). It provides rapid, multi-element determinations with sufficient accuracy to assure product quality.
The ASTM D2674 is a standard test method for the analysis of sulfochromate etches solution used in the surface preparation of aluminum. The ASTM D2674 standard specifies a method for determining the efficacy of an etchant used to prepare the surface of aluminum alloys for subsequent adhesive bonding.
An immunological method for quantization of Hevea Natural Rubber (HNRL) proteins using rabbit anti-HNRL serum. Rabbits immunized with HNRL proteins react to the majority of the proteins present, and their sera have the capability to detect most if not all the proteins in HNRL.
ASTM G65 measures the resistance of metallic materials to abrasion using the dry sand/rubber wheel apparatus. The quality, durability, and toughness of the sample are determined using this test. Metallic materials are ranked in their resistance to scratching abrasion under a controlled environment.
ASTM E2141 test methods provide accelerated aging and monitoring of the performance of time-dependent electrochromic devices (ECD) integrated in insulating glass units (IGU). This test helps to understand the relative serviceability of electrochromic glazings applied on ECD.
ASTM C724 test method is used in analyzing the quality and ease of maintenance of a ceramic decoration on architectural-type glass. This test method is useful in the acknowledgment of technical standards.
Send us a request
Process for testing
You share material and testing requirements with us
We ensure your sample pick-up in an ensured manner
We deliver test report to your inbox
Just share your testing requirements and leave the rest on us!
Free, no-obligation consultation
Quick turnaround time
Let us combine our capabilities to achieve success!!