1.1 This International Standard specifies methods for testing flexible and semi-rigid
cellular plastics made from polyethylene. Cellular plastics containing copolymers
of ethylene or blends of polymers with polyethylene may also be tested by the procedures
of this International Standard provided these materials have characteristics similar
to polyethylene as described in ISO 1872‑1, or copolymers of ethylene as described in ISO 4613‑1.