ASTM D1149 Ozone Chamber

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 According to ASTM D1149, the ozone test Apparatus should be :

5.1.2 The volume of the chamber shall be at least 0.11 to 0.14 m3 (4 to 5 ft3 ).

5.1.3 A means for generating and controlling an air-ozone stream shall be provided. The generating source shall be located outside of the chamber. The source of air can be either drawn directly from the laboratory or from a compressed air supply. In either case adequate filtration of foreign matter from the stream must be provided. The air-ozone stream shall be introduced into the chamber in such a manner that stratification of ozone is prevented.

5.1.4 Irradiation of an air stream with a mercury vapor lamp is the most common source of the necessary ozonized air stream.3 The rate of ozone generation in this system is easily controlled by adjusting the power input to the lamp. This adjustment may be manually or, preferably, automatically controlled.

5.1.5 The air-ozone replacement rate or throughput rate must be of a magnitude such that no appreciable reduction in ozone concentration results from the introduction of test specimens. This minimum replacement rate will vary with the ozone level, temperature, number of test specimens introduced, and their reaction with ozone. For many chambers operating under normal conditions (at an ozone partial pressure of approximately 50 mPa), an air-ozone replacement rate of a three-fourth change per minute is an acceptable and adequate value. For thorough and accurate work, especially under unusual conditions, the minimum or safe replacement rate should be determined.

5.1.6 A means of providing adequate internal circulation shall be provided. The air-ozone velocity in the chamber shall be at least 0.6 m/s (2 ft/s). Where it is doubtful that such velocities exist, the installation of an ordinary 1700 r/min electric motor and fan blade of approximately 150-mm (6-in.) diameter and 20 to 30° pitch will produce such air velocities. The motor itself shall not be in the chamber. An extension shaft shall be used with an appropriate seal.

5.1.7 A means of controlling the temperature of the chamber shall be provided. The temperature regulation should be capable of maintaining the test temperature within 6 1°C (6 1.8°F). 5.1.7.1 Ozone testing at optional subambient test temperatures requires the use of refrigerated test chambers meeting the other requirements of this test method.

5.1.8 Chambers must be equipped such that the operator is never exposed to harmful concentrations of ozone. This is done most commonly by exhausting the ozone from the test chamber before opening; however, other venting and protective measures may be used.

LIB ASTM D1171-18 Ozone Chamber meet this standard, and provides a stable ozone environment for testing below:

Rotating Sample Holder

Static + dynamic combined sample holder can stretch samples. Rotating sample holder allows the sample to be evenly exposed to the ozone condition.

 

Ozone Generating Unit

Ozone is produced by the discharge method, the required raw materials are simple, only electricity, air or oxygen, there is no raw material transportation problem, and the generator structure is simple.

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