GB/T 12585-2020Rubber, vulcanized or thermoplastic. Rubber sheets and rubber-coated fabrics. Determination of transmission rate of volatile liquids(gravimetric technique) (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 12585-2001 "Rubber, vulcanized or thermoplastic

- Rubber sheets and rubber-coated fabrics - Determination of transmission rate

of volatile liquids (gravimetric technique)". Compared with GB/T 12585-2001,

the main technical changes are as follows:

- ADD the contents of "Warning 2";

- ADD ISO 2231 and ISO 18899:2013 to the normative references; USE ISO

23529 to replace GB/T 2941-1991, GB/T 5723-1993, GB/T 9865.1-1996,

(see Chapter 2; Chapter 2 of the 2001 edition);

- MODIFY the "transmittance" as mentioned in the terms and definitions and

the full text into "transmission rate" (see Chapter 3; Chapter 3 of the 2001

edition)

- ADD the calibration requirements of the test instrument (see Chapter 5);

- ADD the description of adjustment options (see Chapter 8);

- MODIFY the presentation method of the test report (see Chapter 12;

Chapter 11 of the 2001 edition);

- ADD the "calibration plan" (see Appendix A).

This standard, using the translation method used, identically adopts ISO

6179:2017 "Rubber, vulcanized or thermoplastic - Rubber sheets and rubber-

coated fabrics - Determination of transmission rate of volatile liquids

(gravimetric technique)".

The Chinese documents that have a consistent correspondence relationship

with the normatively cited international documents in this standard are as

follows:

- GB/T 2941-2006 Rubber - General procedures for preparing and

conditioning test pieces for physical test methods (ISO 23529:2004, IDT)

- GB/T 3512-2014 Rubber, vulcanized or thermoplastic - Accelerated ageing

and heat resistance tests (ISO 188:2011, IDT)

- GB/T 6003.1-2012 Test sieves - Technical requirements and testing - Part

1: Test sieves of metal wire cloth (ISO 3310-1:2000, MOD)

- GB/T 24133-2009 Rubber - or plastics-coated fabrics - Standard

Rubber, vulcanized or thermoplastic - Rubber sheets

and rubber-coated fabrics - Determination of

transmission rate of volatile liquids (gravimetric

technique)

Warning 1: The personnel using this standard shall be familiar with the

formal laboratory operating procedures. This standard is not intended to

involve all safety issues that may arise due to the use of this standard. It

is the user's responsibility to formulate corresponding safety and health

systems and ensure compliance with national laws and regulations.

Warning 2: Certain procedures specified in this standard may contain

used or generated substances or generated wastes, so as to constitute a

locally hazardous environment. Safe handling and disposal after use shall

refer to appropriate documents.

1 Scope

This standard specifies two methods for measuring the permeability of rubber

when volatile liquids diffuse into the atmosphere by measuring the transmission

rate.

This method is only suitable for sheet materials and rubber-coated fabrics which

have a thickness between 0.2 mm and 3.0 mm.

This method is limited to the measurement of transmission rates greater than

3 consecutive 24 h +/- 2 h test cycles and the average value km obtained from

these 3 test cycles is not more than 10%.

Note: According to the transmission rate, there may be other more suitable

periods (see 9.2).

Repeat the procedure by the use of the remaining specimens, starting from 10.1

each time.

The average value km obtained from the three specimens shall be within 15%

of its median value KM. Otherwise, repeat the measurement and use the full set

of data from the two sets of measurements to calculate the result (see Chapter

11).