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Significance and Use
General purpose and many specialty rubbers will undergo ozone cracking when exposed to ozone containing atmospheres, when the test specimens or actual use products are under a certain degree of tensile strain. Certain additives such as antiozonants and waxes inhibit or prevent this cracking. Various rubbers and rubber formulations containing such additives are customarily evaluated under static or dynamic tensile strain in laboratory ozone chambers. This standard provides for an accurate assessment of the ozone content of such chambers used in Test Methods D 518
1.1 These test methods cover the following three types of methods for the determination of ozone content in laboratory test chambers. Method A (UV absorption) is specified for reference or referee purposes and as a means of calibration for the alternative methods; Method B, instrumental device (electrochemical or chemiluminescence); and Method C, wet chemical techniques (see Appendix X1). These methods are primarily intended for use with tests for determining rubber ozone cracking resistance and thus are applicable over the ozone level range from 25 to 200 mPa.
Note 1—Prior to 1978, ozone concentrations were expressed in ASTM D11 Standards in parts per hundred million (pphm) of air by volume. See Appendix X2 for an explanation of the change to partial pressure in millipascals (mPa).
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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. For a specific hazard statement, see Note 2 and 5.1.
Note 2—Warning—Ozone is a hazardous chemical.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D518 Test Method for Rubber Deterioration--Surface Cracking
D1149 Test Methods for Rubber Deterioration--Cracking in an Ozone Controlled Environment
D1171 Test Method for Rubber Deterioration--Surface Ozone Cracking Outdoors or Chamber (Triangular Specimens)
D3395 Test Methods for Rubber Deterioration--Dynamic Ozone Cracking in a Chamber
ISO StandardISO-1431/I,IIandIII Rubber Ozone Testing; Static, Dynamic and Analysis Methods (respectively)
Federal StandardCodeofFederalRegulat Parts 1 to 51, July 1, 1984, Appendix D (Ozone in Atmosphere) pp. 550-562
ICS Number Code 83.060 (Rubber)
UNSPSC Code 13100000(Rubber and elastomers)