General flexible polyurethane cellular plastics
1 Scope
This document specifies the classification, grading, requirements, inspection rules as well as marking, packaging, transportation and storage of general flexible polyurethane cellular plastics, and provides corresponding test methods.
This document is applicable to flexible polyurethane cellular plastics in sheet, strip, block or cut shape.
This document does not apply to slow-resilience flexible polyurethane cellular plastics, high-resilience flexible polyurethane cellular plastics and thermoplastic flexible polyurethane cellular plastics.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 2918-2018 Plastics - Standard atmospheres for conditioning and testing
GB/T 6342-1996 Cellular plastics and rubbers - Determination of linear dimensions
GB/T 6343-2009 Cellular plastics and rubbers - Determination of apparent density
GB/T 6344-2008 Flexible cellular polymeric materials - Determination of tensile strength and elongation at break
GB/T 6669-2008 Flexible cellular polymeric materials - Determination of compression set
GB/T 6670-2008 Flexible cellular polymeric materials - Determination of resilience by ball rebound
GB/T 9345.1-2008 Plastics - Determination of ash - Part 1: General methods
GB/T 9640-2008 Flexible and rigid cellular polymeric materials - Accelerated aging tests
GB/T 10807-2006 Flexible cellular polymeric materials - Determination of hardness (indentation technique)
GB/T 10808-2006 Flexible cellular polymeric materials - Determination of tear strength
QB/T 2819-2006 Flexible cellular materials determination of long time fatigue
QC/T 850-2011 Polyurethane foam for seating of passenger car
3 Classification
General flexible polyurethane cellular plastics products are divided into five categories according to application fields: X, V, S, A and L, and their application types are shown in Table 1.
Table 1 Categories and purpose types
Category Purpose types
X Extremely severe
V Very severe
S Severe
A General
L Minor
See Annex A for categories and recommended application fields.
4 Grading
General flexible polyurethane cellular plastics are classified according to 40% indentation hardness, as shown in Table 2.
Foreword i
1 Scope
2 Normative references
3 Classification
4 Grading
5 Requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, transportation and storage
Annex D (Informative) Categories and recommended application fields.
