Hybrid adjustment type chloroprene rubber CR321, CR322 (Appendix A)

Appendix A

(Normative appendix)

Determination of volatile matter of chloroprene rubber CR321 and 322

A.

This appendix specifies the oven method to determine the moisture and other volatile substances in CR321 and CR322 raw rubber

A.

The sample is dried in an oven for a certain period of time: the mass loss in this process is the volatile content

A.

A.

A.

A.

A.

A.

A.

A.

The mass fraction w of volatile matter, expressed in %, is calculated according to formula (A.

Where:

m ₁ —The mass of the sample before drying, in grams (g);

m ₂ —The mass of the sample after drying, in grams (g)

The result should be expressed to two decimal places

A.

When the volatile content is less than 0.
22%, the difference between the two parallel determination results is not more than 0.
04%
.

When the volatile content is between 0.
23% and 0.
70%, the difference between the two parallel determination results shall not exceed 0.
15%
.

When the volatile content is between 0.
71% and 1.
50%, the difference between the two parallel determination results shall not exceed 0.
22%
.

A.
7 Experiment report

The experiment report should include the following:

a) A detailed description of the sample;

b) Test results of each sample;

c) Any optional operations not included in this appendix;

d) Test date
.