ASTM-D7487 › Standard Practice for Polyurethane Raw Materials: Polyurethane Foam Cup Test
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Scope
1.1 This practice covers the determination of cream time (initiation time), top of cup time, free rise time, free rise height, string gel time (pull time), tack free time, settle back, and free rise density of polyurethane foam formulations using a cup foam test.
1.2 Typical definitions, terms, and techniques are described; including procedures for mixing and transferring samples to the foaming container; and data gathering and evaluation. However, agreement between the customer and the testing laboratory for all these items must be obtained prior to use.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This 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.
1.5 This 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.
Significance and Use
5.1 General Utility:
5.1.1 It is useful to verify catalyst levels in a resin blend or a polyurethane system.
5.1.2 This practice is suitable for research, quality control, specification testing, and process control.
5.2 Limitations:
5.2.1 Several of the measured parameters are subjective. Therefore, operator-to-operator variability and lab-to-lab variability can be much higher than that of a single operator.
5.2.2 The variability of this practice is dependent on the consistency of mixing of the reactants.
5.2.3 The estimation of precision in this practice is based on typical formulations for rigid and flexible foams. Formulations with faster reaction times will likely have greater variability, particularly cream time (initiation time). Formulations with slower reaction times will likely have greater variability in the measurement of free rise time.
5.2.4 It is possible that low-level (ppm, ppb) ingredient contamination will not be detectable using this practice. Confirmation of such contamination will potentially require large-scale (~20 L) tests and is out of the scope of this practice.
Keywords
cream time; cup test; foam testing; formulated polyol; free rise density; free rise height; free rise time; initiation time; isocyanate; polyurethane; pull time; raw material; resin blend; settle back; sigh back; sink back; string gel time; tack free time; top of cup time;
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83.080.10 (Thermosetting materials Including ebonite Silicones, see 71.100.55)
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Document Number
ASTM-D7487-24
Revision Level
2024 EDITION
Status
Current
Modification Type
Revision
Publication Date
Feb. 22, 2024
Document Type
Practice
Page Count
5 pages
Committee Number
D20.22