GB/Z 44426.7-2026 Assistive products for tissue integrity when lying down—Part 7:Foam properties,characteristics and performance

Scope

This document defines the terms used by manufacturers and laboratories to quantify the performance of foam materials and describes common testing methods. It provides information to users or purchasers of these products, enabling them to make informed assessments of the physical characteristics of various products on the market.
This document provides the following information on latex foam testing:
—— Polyurethane foams produced by block (block foam) or molded foam processes - typically polyether (polyether-based polyurethane foams) or polyester-based (polyester-based polyurethane foams);
—— Latex foams produced by the Dunlop process or the Talalay process.
The physical properties covered in this document include:
a) Rebound performance;
b) Hysteresis loss;
c) Support/compression coefficient;
d) Density;
e) Hardness;
f) Compression permanent deformation;
g) Tensile strength;
h) Tear strength;
i) Flow/air permeability;
j) Fatigue resistance;
k) Antimicrobial performance.
Note: The testing methods described in this document do not necessarily simulate actual usage conditions. Therefore, the use of the resulting data is limited to broad comparative evaluations of different foam products.
This document only addresses the characteristics and performance of foam materials used in assistive devices for protecting tissue integrity (APTI), and does not address the design of the products, their construction methods, or other factors related to final clinical efficacy.
This document does not address any testing methods for the physical properties of outer casings or the impact of outer casings on the physical properties of foam materials.

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