ASTM D4660 Determination of the Isomer Content of Toluene diisocyanate
ASTM D4660 test method determines the isomer content of toluene-2,6-diisocyanate and toluene-2,4-diisocyanate in the mixture of 2,4- and 2,6-toluene diisocyanate isomers. To get accurate results over a broad range of isomer concentrations, two different test methods are applied. The final results are expressed in SI Units.
The ASTM D4660 test method is essential to get accurate readings at different sample concentrations. It helps determine the isomer content of toluene diisocyanates. It defines a standard to control the quality and application of these diisocyanates. It characterizes the isocyanates found in polyurethane products and is applicable for research purposes. It determines the isomer content by considering the infrared spectrum of the sample. It provides information about the reactivity of toluene diisocyanates which helps specify their reliability and their application.
The apparatus for ASTM D4660 testing consists of a spectrophotometer, NaCl liquid absorption cell, and a 25 mL glassware. The apparatus is set up to determine the isomer content of toluene diisocyanates. A dry pipette is used to add 0.98 g of the sample into a volumetric flask, which is then diluted with anhydrous cyclohexane. The 0.2 mm cell is filled with cyclohexane, and the solvent spectrum is observed. The same is done by filling the cell with the sample solution. This test method provides quantitative measurement of absorption bands formed by the deformation of C-H bonds in the aromatic ring. The infrared spectrum of the solutions is recorded and the absorbance ratio is determined.
For ASTM D4660, the sample is taken as per the requirements. The 0.98 g sample consisting of either 5 to 95% of toluene-2,6-diisocyanate or 0 to 5% toluene-2,6-diisocyanate is taken.
The percentage of each isomer can be calculated for ASTM D4660 testing by using the isomer weight ratio, (R), as follows:
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
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!!