3.1 These test methods are intended for quality control acceptance of natural rubber and may be used for referee purposes.

1.1 These test methods cover the sampling and chemical analysis of solid natural rubber in the forms supplied to the rubber industry.

1.2 The analytical procedures appear in the following order:

Sections

Sampling

5

Volatile Matter

6 – 8

Dirt

 9 – 13

Ash

14 – 17

Copper (Referee Colorimetric Method)

18 – 22

Copper (Alternative Colorimetric Method)

23 – 27

Copper (Alternative Flame Atomic Absorption Method)

28

Manganese (Colorimetric Method)

29 – 33

Manganese (Alternative Flame Atomic Absorption Method)

34

Iron (Colorimetric Method)

35 – 39

Acetone Extract

40 – 41

Rubber Hydrocarbon

42 – 43

Nitrogen

44 – 45

1.3 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.

1.4 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.