A catalytic converter is part of a car's exhaust system. Catalytic conversion device is an exhaust purification device that converts CO, HC, and NOx in exhaust gas into gases that are harmless to human body by using the action of catalyst, also known as catalytic conversion device. The catalytic conversion device converts the three harmful gases CO, HC, and NOx in the exhaust gas into harmless gases carbon dioxide, nitrogen, Hydrogen and water. http://www.xichuangcatalyst.com/catalytic-converter/

The USB cable is used for the connection and communication between the computer and external devices, and can also be used for the charging of the mobile phone and the connection with the outside, that is, for data transmission and charging. USB is the most widely used external bus standard in the PC field. It is used to standardize the connection and communication between the computer and external devices. The USB interface supports the plug-and-play and hot-swap functions of the device. http://www.toplinkall.com/usb-cable/

Hot dipped galvanized steel pipes are made by reacting the molten metal with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined. Hot-dip galvanizing is to first pickle the steel pipe to remove iron oxide on the surface of the steel pipe. After pickling, it is cleaned in a tank of ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to a hot dip plating tank. http://www.ruijiesteelpipe.com/galvanized-steel-pipe/hot-dipped-galvanized-steel-pipe/

The internationally recognized European Standard is EN 589. In the United States, tetrahydrothiophene (thiophane) or amyl mercaptan are also approved odorants, although neither is currently being utilized. An LPG regulator is a device that maintains a stable downstream pressure regardless of changes in gas flow and upstream pressure. Among them, the LPG jumbo regulator and the LPG quick-on regulator are typical representatives. http://www.peakgasregulator.com/gas-regulator/lpg-jumbo-regulator/

Gears with teeth on the internal side of the cylinder are known as "internal gears". An external gear can mesh with an external gear or an internal gear. When two external gears mesh together they rotate in the opposite directions. An internal gear can only mesh with an external gear and the gears rotate in the same direction. Due to the close positioning of shafts, internal gear assemblies are more compact than external gear assemblies. The spur gear slewing drive type is the more common one. http://www.ldb-slewdrive.com/spur-type-slewing-drive/

Latex pillows are made of the sap of rubber trees, and it is impossible to make latex pillows made of 100% pure latex. The latex content of latex pillows on the market is only 80%-97%. Because pure latex cannot achieve coagulation and fluffy effects, it needs to be artificially fermented with safe materials. Latex pillow has the characteristics of natural environmental protection, non-polluting, non-toxic, anti-allergic and so on. http://www.kxthome.com/pillow/latex-pillow/

Shearing butt welding machine is an important equipment on the welded pipe production line. It is used for shearing and butt welding of the irregular parts of the head and tail of the strip to ensure the continuous production of the welded pipe machine unit. The forming and sizing machine is the main equipment in the welded pipe production line. It can continuously roll a certain specification of long steel strip into a tube and weld it into a tube. http://www.jaronmachine.com/welded-pipe-machine-unit/

Epoxy sheet is also called insulating board, epoxy board, 3240 epoxy board. Epoxy resins generally refer to organic polymer compounds containing two or more epoxy groups in the molecule. Except for a few, their relative molecular mass is not high. The molecular structure of epoxy resin is characterized by the presence of active epoxy groups in the molecular chain, and the epoxy groups can be located at the end, middle or cyclic structure of the molecular chain. http://www.hcdurostone.com/epoxy-sheet/