ASTM D2227 - 96(2011) Standard Specification for Natural Rubber (NR) Technical Grades


Source: ASTM International

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.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

Significance and Use

The general end-use quality of manufactured rubber products depends on the physical and chemical properties of the rubber.

1. Scope

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

2. Referenced Documents (purchase separately)

ASTM Standards
D1278 Test Methods for Rubber from Natural Sources--Chemical Analysis
D1485 Practice for Rubber from Natural Sources--Sampling and Sample Preparation
D1646 Test Methods for Rubber--Viscosity, Stress Relaxation, and Pre-Vulcanization Characteristics (Mooney Viscometer)
D3157 Test Method for Rubber from Natural Sources--Color
D3194 Test Method for Rubber From Natural Sources--Plasticity Retention Index (PRI)
D3533 Test Method for Rubber--Nitrogen Content

Index Terms

natural rubber (NR); technical grade ; Rubber--specifications; Technical grades; Natural rubber (NR)--specifications

ICS Code

ICS Number Code 83.040.10 (Latex and raw rubber)

DOI: 10.1520/D2227-96R11

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