AS 2281-1993 pdf free.Flexible Cellular Polyurethane For Seat Cushioning And Bedding.
AS 2281 sets out requirements for flexible load-bearing cellular polyurethane, manufactured in block, flat or profiled sheet and strip form, in moulded and fabricated shapes, and as reconstituted material, for use in seat cushioning, bedding and similar applications.
NOTES:
1.Appendix A provides a guide to the grade and thickness of cellular polyurethane foam that may be used for various applications.
2.Appendix B provides a comparison of the nominal hardness of foams specified in this Standard and the previous edition.
3 Appendix C provides discussion on the fire behaviour of flexible cellular polyurethanes.
3 DEFINITIONS For the purpose of this Standard, the following definitions apply.
3.1 Accelerated ageing-laboratory procedures for measuring changes in properties due to the application of heat or humidity, or both. In such tests, the long-term degradation effects of oxidation and hydrolysis are simulated.
3.2 Apparent density-the mass per unit volume of cellular material in air, at a stated temperature and relative humidity.
3.3 Compression set-the percentage difference between the initial thickness of a test piece of cellular material, and final thickness after compression for a given time and a nominated recovery time, as determined by AS 2282.9.
4 Elongation-the change in gauge length of a test piece at the time of a break, expressee as a percentage of the original gauge length, when tested in accordance with AS 2282.6.
3.5 Flexible cellular polyurethane-flexible expanded polymeric material of predominantly open cell structure, manufactured essentially from polyhydroxy compounds and polyisocyanates.
3.6 Hardness-a term referring to the deflection characteristics of flexible cellular polyurethane, measured by indentation force (IFD )on deflection.
NOTE: The IFao value is the force in newtons required to indent by 40 percent a sample of cellular.
polyurethane 380 mm x 380 mm x 50 mm in size, using the procedure described in Method A of AS2282.8.
3.7 Indentation factor-the ratio of the indentation forces required to indent a specimen of material to 65 percent and 25 percent respectively of its test thickness, when tested in accordance with Method A of AS 2282.8.
3.8 Reconstituted cellular polyurethane-Small pieces of flexible cellular polyurethae bonded together by means of a suitable binder, then moulded and cured into the required 3.9 Recovery ratio-the ratio, expressed as a percentage, of indention forces on relaxation and initial application required to indent a specimen of material by 25 percent of its thickness when tested in accordance with Method A of AS 2282.8.
3.10 Resilience-a measure of the rebound of the material, as determined by AS 2282.11.AS 2281 pdf download.