The NBS smoke density chamber (ASTM E662) is the most popular test instrument used to measure smokeobscuration. In its standard use, it can accommodate only samples in the vertical orientation.

The NBS Smoke Density Chamber test method is from the National Institute of Standards and Technology NIST (predecessor of NBS) and has been promoted and applied in many test fields. This test method can be used to detect plastic products and non-metallic materials for rail transit. Smoke density grades of non-metallic materials, wire and cable products, e tc. According to the test method, the generally applicable standards are ASTM E662, ISO 5659-2, and the NES 711 smoke density test method in the military standard.

The previous building material smoke density tester method has more accurate test results, and the optical sensor uses a more precise photomultiplier tube to capture the slight change of flue gas content in the box; if other test devices are selected, such as Dräger gas detection Tube, can carry out aviation standard smoke toxicity test, and dock with FTIR Fourier transform infrared device, can complete the qualitative and quantitative analysis of flue gas content.

Standards:
ASTM E662  ISO 5659-2 IMO:FTPC Part 2   NES 711

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