Technical Specifications

ASTM D1056 Quick Reference Guide

This specification covers flexible cellular rubber products known as sponge rubber and expanded rubber, but does not apply to latex foam rubber or ebonite cellular rubber. The base material for an open/closed cellular product may be of synthetic,natural, or reclaimed rubber, or a mixture, and may contain other polymers and chemicals, or both, which may be modified by organic or inorganic additivies.

Definitions specific to this standard:

Cellular Rubber: A generic term for materials containing many cells - either open, closed, or both - dispersed throughout the mass.

Closed Cell: A product whose cells are totally enclosed by its walls and hence not interconnecting with other cells.

Expanded Rubber: Cellular rubber having closed cells made from a solid rubber compound.

Flexible cellular material: A flexible cellular organic polymeric material that will not rupture within 60 s when a specimen 200 by 25 mm (8 by 1 by 1 in) is bent around a 25 cm (1 in) diameter mandrel at a uniform rate of 1 lap/5 s in the form of a helix at a temperature between 18 and 29°C (65-85°F).

Open Cell: A product whose cells are not totally enclosed by its walls and open to the surface, either directly or by interconnecting with other cells.

Skin: The textured outer surface on the m aterial formed during manufacture by contact with molds, cover plate, and or other curing medium.

Types:

Type 1: Open-Cell Rubber

Type 2: Closed-Cell Rubber

Classes:

Class A: Cellular rubber made from synthetic rubber, natural rubber, reclaimed rubber, or rubber-like materials, alone or in combination, where specific resistance to the action of petroleum base oils is not required.

Class B: Cellular rubber made from synthetic rubber or rubber-like materials alone or in combination, having specific requirements for oil resistance with low mass change.

Class C: Cellular rubber made from synthetic rubber or rubber-like materials alone or in combination, having specific requirements for oil resistance with medium mass change.

Class D: Cellular rubber made from synthetic rubber or rubber-like materials alone or in combination, having specific requirements for extreme temperature resistance [-75 to 175°C or -103 to 347°F] but specific resistance to the action of petroleum-base oils is not required.

Grades:

Grade 0: For Types 1 and 2 cellular rubber, a compression-deflection range from 0 to 16 kPa 0 to 2 psi.

Grade 1: For Types 1 and 2 cellular rubber, a compression-deflection range from 15 to 35 kPa 2 to 5 psi.

Grade 2: For Types 1 and 2 cellular rubber, a compression-deflection range from 35 to 65 kPa 5 to 9 psi.

Grade 3: For Types 1 and 2 cellular rubber, a compression-deflection range from 65 to 90 kPa 9 to 13 psi.

Grade 4: For Types 1 and 2 cellular rubber, a compression-deflection range from 90 to 120 kPa 13 to 17 psi.

Grade 5: For Types 1 and 2 cellular rubber, a compression-deflection range from 120 to 170 kPa 17 to 25 psi)