The BS 7238 smoke density test is an important tool for evaluating the fire safety properties of materials, as smoke can often be more harmful than flames in a fire. The test provides a measure of the amount of smoke that material will generate when exposed to heat, allowing for the comparison of different materials and the selection of materials that are less likely to generate large amounts of smoke in the event of a fire.
Why Do BSS Tests Exist?
The Boeing Safety Standard, or BSS testing, is a technique for evaluating the gasses produced during combustion by particular materials. Materials that catch fire release gasses that, in some concentrations, could be harmful to people. To assess the safety of various materials, this test identifies and quantifies those harmful gasses.
By burning sample pieces of materials in a controlled environment, BSS testing identifies which harmful gasses are emitted and how much of each gas is created. The most used technique for determining the toxicity levels of the gasses is spectrophotometry. Since each molecule uniquely absorbs light, this method uses the way each compound absorbs light to determine what compound is there and in what quantity.
BSS examinations look for gasses like:
Similar tests are utilized in the government and railway industries as well as most frequently as a fire test for aeroplane materials. The purpose of BSS testing is to identify the properties of materials that cause smoke to be produced during combustion to assess their suitability for these sectors.
What Is Tested by BSS 7238?
Smoke density testing for aviation materials is done according to Boeing Safety Standard 7238. By recording the attenuation of a light beam through the smoke, it calculates the specific optical density of smoke created by burning aircraft material. Samples are placed in a smoke-density chamber that is closed and subjected to either radiant heat alone or radiant heat with a flame during this examination. The tester measures the light transmittance values to ascertain the optical density of the smoke while the substance goes through either flameless disintegration or blazing combustion.
To pass the test, the smoke produced must not exceed a certain smoke optical density value. Depending on the requirements of the evaluation, a different smoke density value will be needed.
The fire response of materials used in aeroplanes of the Boeing type is the focus of BSS 7238 smoke density testing. Plastic goods, wire ropes, non-metallic materials, and other like items will all be tested. Sample pieces may comprise wall panels, partitions, huge cabinet walls, and galley structures. The materials evaluated are ones frequently seen in passenger-occupied aircraft compartments.
Testing Requirements for BSS 7238
The BSS 7238 test must meet the following conditions:
The ASTM E662 test, which also measures smoke density, is the basis for the BSS 7238 test. The flammability test ASTM E662 is frequently necessary for coatings and polymers used in the construction, railroad, and military sectors.
Video 01:Smoke Density Test Apparatus | Smoke Density Test Method | Smoke Density Test |Smoke Density Tester
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