GB / T 8323 standard is suitable for testing the specific optical density of smoke produced by burning plastic, and the maximum specific optical density is used as the test result. The initial version of the national standard GB / T 8323 was promulgated in 1987 and lasted for more than 20 years. Its standard is modeled on the American ASTM E662 standard. The tested indicators are specific optical density and maximum smoke density. The heat radiation source used is the radiation furnace device. The sample is a hanging installation method, the heat radiation value generated by the radiant furnace is 25KW / m2, and the specific optical density and the maximum smoke density of the material are determined through the flame and flameless combustion methods and the corresponding optical paths.
On December 30, 2008, the new GB / T 8323 standard was promulgated. The adopted standard was the ISO 5659-2 standard. The heating device was changed to a radiation cone. The heat radiation value generated was 50KW / m2, and the sample installation method was horizontal. status. The purpose of its modification is mainly applicable to thermally expandable samples, and the photomultiplier tube is specified for the receiving sensor in the optical path.
Our hanging plant stand is made of 100% natural cotton rope , meticulously handcrafted , eco - friendly , no smell , sturdy and not easy to be out of shape or breakage . Great way to show your lovely plants , also a unique boho home decor . Macrame cord for plant hangers , great for indoor - outdoor use , macrame wall planter , like a bay window , home , office , porch , patio or garden . Also an ideal gift for housewarming , birthday , wedding , Christmas , and more !
Plant Holder,Plant Stand Indoor,Rattan Plant Stand,Modern Plant Stand
Shandong Guyi Crafts Co.,Ltd , https://www.gyicraft.com