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Significance and Use
This practice outlines a procedure for sampling and sample preparation of natural rubber. A statistical method for determining a quality index and lot acceptability is given. The sampling plan is optional for quality control or production, but may be used when needed for referee purposes.
1.1 This practice, intended for referee purposes, covers a uniform procedure for sampling lots of solid natural rubber. Natural rubber generally is marketed in bales or packages of various sizes.
1.2 A procedure for determining the acceptability of lots of natural rubber is given. This procedure is based on a variable sampling plan.
1.3 The sample size is based on the assumption of a visually homogeneous material. If obvious heterogeneity exists, the number of samples shall be increased.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1278 Test Methods for Rubber from Natural Sources--Chemical Analysis
D3182 Practice for Rubber--Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets
D3184 Practice for Rubber--Evaluation of NR (Natural Rubber)
ICS Number Code 83.040.10 (Latex and raw rubber)
UNSPSC Code 13101500(Natural rubber)