MAPP is colorless in both liquid and gas form. The gas has a pronounced acetylene-like or fishy odor at concentrations above 100 ppm, due to the addition of substituted amines as a polymerization inhibitor. Low molecular weight alkynes have strong odors. Mapp Gas is toxic if inhaled at high concentrations. Mapp gas is a mixture of various hydrocarbons, principally, methylacetylene , propadiene and Propane(MAPP). It produces a relatively hot flame (2,976°C) with a high heat release in the primary lame (inner cone) (15,445kJ/m 3 ), less than for acetylene (18,890kJm 3 ) but much higher than for propane (10,433kJm 3 ). The secondary flame (outer cone) also gives off a high heat release, similar to propane and natural gas. The combination of a lower flame temperature, more distributed heat source and larger gas flows compared with acetylene results in a substantially slower pierce time. Mapp Gas Mapp Gas,Mapp Gas Torch,Mapp Torch,Mapp Gas Temp ZHEJIANG ICE LOONG ENVIRONMENTAL SCI-TECH CO.,LTD. , http://www.china-refrigerantgas.com
The use of refrigerators in the early spring season, the identification of common sense Raiders
The cold winter is getting farther away, and the temperature above ten degrees for several days seems to make us smell the spring. Many friends will restart the refrigerator that was stopped in the winter. After the refrigerator is deactivated for a long time, the lubricating oil in the compressor sinks to the bottom, and the working parts in the machine are in a dry state. If you turn it on at this time