| 标准编号 Standard/Code | 标准名称 Standard Title |
| ASTM D3574 | Standard Test Methods for Flexible Cellular Materials—Slab, Bonded, and Molded Urethane Foams |
5.1 The test procedures provide a standard method of obtaining data for research and development, quality control, acceptance and rejection under specifications, and special purposes.
5.2 The data obtained by these test methods are applicable to the material under conditions of the particular test and are not necessarily the same as obtained in other environments in use.
1. Scope
1.1 These test methods apply to slab, bonded, and molded flexible cellular products known as urethane foams. Urethane foam is generally defined as an expanded cellular product produced by the interaction of active hydrogen compounds, water, and isocyanates.
1.2 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 and health practices and determine the applicability of regulatory limitations prior to use.
1.3 The values stated in SI units are to be regarded as standard.
NOTE 1: There is no known ISO equivalent to this standard, however certain test methods in this standard have similar or equivalent ISO standards and are listed in the scope of the individual test method sections.
Test Requirement 测试要求：
|
Test item |
No. of specimens | Figures of test result |
| Test A—Density 密度测试（kg/m3） | 3pcs 100*100*100mm | Calculate the density in kilograms per cubic metre |
| Test B1—IFD 硬度 （N） | 3pcs 380*380*100mm | The force in newtons required for 25% and 65% indentations |
| Test B2—IFD-specified force | 3pcs 380*380*实际厚度 mm | The thickness after 60±3s at 4.5N,110N and 220N |
| 指定力下的硬度 (N) | ||
| Test C—Compression force deflection test 压缩系数 | 3pcs 50*50*25mm | Compress the specimen 50% of the thickness at 50mm/min and determine the final force after 60±3s |
| Test D—Constant deflection compression set test 压缩永久变形（%） | 3pcs 50*50*25mm | Place the specimen and deflect it to either 50% 75% or 90% of its thickness, at air oven 70±2℃ and 6% RH. For 22 |
| Test E—Tensile/Elongation test拉伸强度(kgf/cm2)/伸长率(%) | 3pcs 25.4*139.7*12.5mm | At 500mm/min, Calculate the tensile strength by dividing the maximum breaking force by the original cross-sectional area of the specimen |
| Test F—Tear resistance test | 3pcs 152.4*25.4*25.4mm | At 500mm/min tear strength in newtons per meter |
| 撕裂强度(N/m) | ||
| Test I1—Fatigue test :static force loss test at constant deflection 静态疲劳测试 | 3pcs 380*380*实际厚度mm | Percentage loss of thickness and the percentage loss |
| of 25 and 65 % IFD if the thickness loss is less than 10 % |
Sample Size 样品数量 / 送样规格: see above 见上面
Lead Time / TAT (Turn Around Time) 测试周期: 常规服务 Regular service 7-9 working days
Report Summary 报告摘要:
