We need your consent to use the individual data so that you can see information about your interests, among other things. Click "OK" to give your consent.
Standard Practice for Polyurethane Raw Materials: Gel Tests for Polyurethane Non-Foam FormulationsTranslate name
STANDARD published on 15.1.2021
Designation standards: ASTM D7997-21
Publication date standards: 15.1.2021
The number of pages: 7
Approximate weight : 21 g (0.05 lbs)
Country: American technical standard
Category: Technical standards ASTM
gel time, isocyanate, polyol, polyurethane, raw material, resin blend,, ICS Number Code 83.080.10 (Thermosetting materials)
|Significance and Use|
5.1.1This practice is suitable for research, quality control, specification testing and process control.
5.1.2It is useful to define and verify the reactivity of non-foam polyurethane formulations.
5.2.1Operator-to-operator variability and lab-to-lab variability can be significant.
5.2.2The variability of this practice is dependent on the equipment used to measure the gel time. It is recommended that the testing laboratory and the client agree on the equipment and the conditions to be used that include the following:
22.214.171.124Gel Tester and gel point criteria,
126.96.36.199Speed/rpm of the mixer,
188.8.131.52Type and shape of the mix blades,
184.108.40.206Size and type (for example, shape, lined or unlined) of container for mixing the components and for measuring the gel time, and
220.127.116.11The volume (or height) of material to be placed in the container for measuring the gel time and the depth of the measuring wire or spindle of the gel tester from the bottom of the container.
5.2.3Users of this practice shall develop their own precision data to determine if these procedures meet their requirements.
5.2.4It is possible that low-levels (ppm, ppb) of contaminants will not be detected using this practice.
1.1This practice covers procedures for determining the gel times of polyurethane non-foam formulations using commercially available gel test equipment.
1.2Definitions, terms, and techniques are described along with procedures for calculating sample weights.
1.3The values stated in SI units are to be regarded as standard.
1.4This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Note 1:There is no known ISO equivalent to this standard.
1.5This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
|2. Referenced Documents|
Latest update: 2022-11-27 (Number of items: 2 642 910)
© Copyright 2022 NORMSERVIS s.r.o.