ASTM D4889-21 Determination of Viscosity of Crude or Modified Isocyanates
ASTM D4889-21 test method is used to determine the viscosity of crude or modified isocyanates. This test method can be applied to toluene diisocyanate, methylene diphenyl isocyanate, and methylene phenyl isocyanate. The values are considered a standard when expressed in SI units.
Average 30% Cost Savings
100% Confidentiality Guarantee
Free, No-obligation Consultation
100% Customer Satisfaction
TRUSTED BY ENGINEERS FROM
ASTM D4889-21 Determination of Viscosity of Crude or Modified Isocyanates
ASTM D4889-21 test method is used to determine the viscosity of crude or modified isocyanates. This test method can be applied to toluene diisocyanate, methylene diphenyl isocyanate, and methylene phenyl isocyanate. The values are considered a standard when expressed in SI units.
Scope:
ASTM D4889-21 is used for research, quality control, or specification testing to characterise isocyanates used in polyurethane products. The viscosity of a fluid is defined as its resistance to a uniform continuous flow without turbulence or other influences. Under specific conditions, some isocyanates display non-Newtonian behaviour.
Procedure:
In ASTM D4889-21, enough samples are the smallest container to cover the immersion mark on the viscometer spindle and submerged in a constant temperature bath to the sample level. The mixture is stirred occasionally to avoid trapping air bubbles, and the temperature is checked at several different places within the container to verify consistency. The viscometer spindle is immersed into a sample to the immersion line. The viscosity of the specimen is tested using a 15-second rotation period.
Specimen Size:
Laboratory humidity should be kept low, preferably about 50% relative humidity, because isocyanates react with moisture. Liquid samples with a viscosity of less than 100 000 mPa.s(cP) at 25°C must be tested at that temperature.
Data:
Using the kinematic viscosity and the density of the sample, calculated the dynamic viscosity:
η = v × ρ
η= dynamic viscosity, mPa·s(cP)
ρ = density, g/cm3
v = kinematic viscosity, mm2/s
Click here for additional information on Viscosity measurement.
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 test is a standard test method for the analysis of sulfochromate etch solutions 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
STEP 01
You share material and testing requirements with us
STEP 02
You ship your sample to us or arrange for us to pick it up.
STEP 03
We deliver the test report to your email.
Just share your testing requirements and leave the rest on us!
Free, no-obligation consultation
Guaranteed confidentiality
Quick turnaround time
Hassle-free process
Let us combine our capabilities to achieve success!!