UL-33:2010 pdf free download – STANDARD FOR SAFETY Heat Responsive Links for Fire- Protection Service.
14 Evaporation Test for Wax Coatings
14.1 When tested as specified in 14.3, a protective coating containing volatiles such as wax or similar material shall not shrink, harden, crack, or flake.
14.2 When tested as specified in 14.3, the loss of volatiles in a wax coating shall not exceed 5 percent of the weight of the original sample.
14.3 A 50 ml sample of the protective coating is to be placed in a metal or glass cylindrical container having a flat bottom, an inside diameter of 55 mm, and an inside height of 35 mm. The container, without any lid, is to be placed in an automatically controlled, circulating-air, constant-ambient-temperature oven. The oven temperature is to be controlled as described in High Temperature Exposure — Test for Wax Coated Heat Responsive Links, Section 13. The test is to be conducted for 90 days. During the test, the sample is to be removed from the oven at 7 day intervals and allowed to cool for not less than 2 nor more than 4 hours. During this cooling time, the sample is to be examined for evidence of shrinking, hardening, cracking, or flaking. The sample is to be weighed before and after the 90 day exposure to determine loss of volatiles.
15 10-Day Corrosion Test
15.1 A heat responsive link shall withstand an exposure to salt spray, hydrogen sulfide, and sulfur dioxide-carbon dioxide atmospheres as specified in 16.1.2 — 16.4.1 for 10 days each. After the exposures, each sample shall comply with the Sensitivity — Oven Heat Test, Section 11.
16 30-Day Corrosion Test
16.1 General
16.1.1 A heat responsive link intended for use in corrosive atmospheres shall withstand an exposure to salt spray, hydrogen sulfide, and carbon dioxide-sulfur dioxide atmospheres as specified in 16.1.2 — 16.4.1 for 30 days. After the exposure, each test sample shall comply with the Sensitivity — Oven Heat Test, Section 11.
16.1.2 Three groups, each consisting of five sample heat responsive links, are to be assembled. One group is to be exposed to 20 percent salt spray, the second to hydrogen sulfide, and the third to sulfur dioxide-carbon dioxide.
16.1.3 Not more than five days nor less than one day after the exposure period, each sample heat responsive link is to be subjected (see 16.1 .1) to the Sensitivity — Oven Heat Test, Section 11.
16.1.4 CAUTION: This test uses hydrogen sulfide and sulfur dioxide, which are both poisonous gases. Hydrogen sulfide gas is also flammable. Because of these hazards, these gases must be stored, transferred, and used only with gastight systems. Adequate ventilation must also be provided to handle any accidental leakage. Due to their unpleasant odor and irritating effects, they give warning of their presence.
16.2 20 percent salt spray
16.2.1 The samples are to be supported vertically and exposed to salt spray (fog) as specified in Method of Salt Spray (Fog) Testing, ASTM Bi 17, except that the salt solution is to consist of 20 percent by weight of common salt (sodium chloride).
16.3 Moist hydrogen sulfide air mixture test
16.3.1 The samples are to be supported vertically and exposed to a moist hydrogen sulfide air mixture in a closed glass chamber maintained at 75 ±5°F (24 ±3°C). On five days out of every seven, an amount of hydrogen sulfide equivalent to 1.0 percent of the volume of the chamber is to be introduced into the chamber from a commercial gas cylinder, the volume required being measured with a flowmeter and timer. Prior to each introduction of gas, the remaining gas-air mixture from the previous day is to be thoroughly purged from the chamber. On the two days out of every seven that this does not occur, the chamber is to remain closed and no purging or introduction of gas is to be provided. During the exposure, the gas-air mixture is to be gently stirred by means of a small fan located in the upper middle portion of the chamber. A small amount of water (10 ml/0.003 m3 of chamber volume) is to be maintained at the bottom of the chamber for humidity.