UL 330A:2019 pdf download

10.2.2.1.3 Static seals shall be subjected to the Compression Set Test in accordance with the Standardfor Gaskets and Seals,UL 157,except for the following modifications:

a) The test duration shall be 1000 hours;

b) The samples shall be immersed,at room temperature，in the test fluids (see item c) whilecompressed for the entire test duration. No oven conditioning is required;

c) The applicable test fluids shall be as described in Supplement SA;

d) The recovery period shall consist of removing the sample from the compression device andimmersing it in the applicable test fluid for 30 minutes at room temperature.The sample shall notbe allowed to dry out due to exposure to air. The 30-minute immersion should use the same fluid asthe test fluid for each sample; and

e) For all materials, the average compression set is calculated and shall not exceed 35 percent.

Exception:This requirement does not apply to composite gasket materials as defined in accordance withthe Standard for Gaskets and Seals,UL 157.

10.2.2.2 Dynamic seals

10.2.2.2.1 Dynamic seals shall be evaluated in accordance with the Standard for Gaskets and Seals, uL157 modified as indicated in 10.2.2.2.1- 10.2.2.2.2.lf a specific material complies with theserequirements, the material can be considered to be qualified for system testing.

10.2.2.2.2 Dynamic seals shall be subjected to the Volume Change and Extraction Test in accordancewith the Standard for Gaskets and Seals, UL 157, except for the following modifications:

a) The test duration shall be 1000 hours;

b) The applicable test fluids shall be as described in Supplement SA; and

c) For all materials, the average volume change for a gasket or seal material shall not exceed 40percent swell (increase in volume) or 1 percent shrinkage (decrease in volume). In addition,theweight loss shall not exceed 10 percent. There shall be no visual evidence of cracking or otherdegradation as a result of the exposure.