Literature

Joint Industry Foam Standards and Guidelines

SECTION 12.0

Published: 7/94

SEATING FOAM PERFORMANCE STANDARDS AND GUIDELINES

12.1
Hysteresis Loss (25%) The method for determining the values from which the 25% deflection hysteresis is measured and calculated shall be in accordance with ASTM D-3574 Test C.

12.1.1
The 25% deflection hysteresis loss for unfilled conventional foams with densities of 2.5 pounds per cubic foot (pcf) or higher and "high resiliency foams" (as defined by ASTM) with densities of 2.5 pcf or higher shall not exceed 20%.

12.1.2
The 25% deflection hysteresis loss for all other foams having polymer densities of 1.8 pcf up to 2.49 pcf shall not be greater than 25%.

12.2
Compression Set: Before Humid Aging Compression sets shall be determined in accordance with the methodology set forth in ASTM D-3574, except the constant sample deflection for all samples shall be 75% of the original sample height. Compression set calculations shall be done in accordance with ASTM D-3574 Section 42.1.1.

12.2.1
A limit of 10% maximum compression set shall apply to the following foam types: Unfilled conventional foams, 1.8 pcf and higher Filled conventional foams, 1.8 pcf minimum polymer density

12.2.2
A limit of 20% maximum compression set shall apply to the following types: High Resiliency (by ASTM definition) type foams Melamine type foams

12.3
Compression Set : After Humid Aging Humid Aging shall be performed according to ASTM D-3574, procedure J.1; and compression set shall be performed according to ASTM D-3574 except all samples shall be deflected 75% of the original sample height. Compression set calculations shall be done in accordance with ASTM D- 3574 Section 42.1.1.

12.3.1
A 10% maximum compression set, after humid aging, shall apply to the following foam types: Unfilled conventional foams, 1.8 pcf and above Filled conventional foams, 1.8 pcf minimum polymer density

12.3.2
A 30% maximum compression set, after humid aging, shall apply to the following foam types: High Resiliency (by ASTM definition) foams Melamine type foams