Standard Historical Last Updated: Jan 30, 2012
ASTM D2227-96(2007)

Standard Specification for Natural Rubber (NR) Technical Grades


This specification covers the minimum physical and chemical requirements for five technical grades of raw natural rubber. Materials are classified into grades according to retained dirt content, ash content, volatile matter content, nitrogen content, initial plasticity, plasticity retention index, color index, and Mooney viscosity. Skim rubber is not permitted in any grade.


1.1 This specification covers minimum physical and chemical quality requirements or specifications for five grades of raw natural rubber.

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Book of Standards Volume: 09.01
Developed by Subcommittee: D11.22
Pages: 2
DOI: 10.1520/D2227-96R07
ICS Code: 83.040.10