Polymeric MDI, also known as crude MDI or polyurethane black material, is a mixture containing a certain proportion of pure MDI and polyphenyl polymethylene polyisocyanate.
Due to different modification methods, there are four varieties as follows: carbamate modified MDI, carbodiimide modified MDI, diazepam modified MDI, carbamate MDI modified with acid ester and diazepine imine.
Molten potassium nitrate are divided into two categories:The service temperature of class I products is t = 250 ℃ ~ 530 ℃, binary composition.The service temperature of class II products is t = 160 ℃ ~ 400 ℃. Type I is triple and type II is binary.
The main varieties include alkyl peroxides and hydroperoxides perspindle acid, ketone peroxide, perphthalein and other organic peroxides used as polymerization initiators.
CBN Single Crystal has high hardness, thermal stability and chemical inertness. Its hardness is second only next to diamond, but its thermal stability is much higher than Single Crystal Diamond.
Molecular formula:AL2O3Molecular weight:102Melting point:2050℃Specific gravity:AL2O3 αtype 2.5-3.95g/cm3Crystal-type:γ、 αFeatures: high purity, granularity can be controlled according to the process, grain distribution, white tasteless powder
They also have advantages in high resilience, low temperature performance and resistance to water attack(hydrolysis). Polyethers also have lower viscosity and specific gravity.
According to the different application scope, PVC can be divided into: general-purpose PVC resin, high polymerization degree PVC resin, and cross-linked PVC resin. The general-purpose PVC resin is formed by the polymerization of vinyl chloride monomer und
99.5% PSA nitrogen generator is based on the principle of pressure swing adsorption, using high-quality carbon molecular sieve as adsorbent to produce nitrogen from air under certain pressure.
Greenway supplies tranexamic acid, which is mainly responsible for inhibiting melanin and reducing melanin, thereby preventing pigmentation and preventing dark spots from expanding.
Tannic acid is obtained by solvent extraction of nutgalls or excrescences that form on the young twigs of Quercus infectoria Oliver and related species of Quercus.
This glasses are suitable for outdoor sports enthusiasts. It can be used for mountaineering,hiking,cycling,skiing and so forth. The design of glasses tends to be fashionable and functional, It is the best choice for people who love outdoor activities.
M1881 Stainless Man's Sunglasses Half Rim Tinted Lens Ultralight Glasses Using stainless steel as the main material of glasses with PC temples and Polaroid lenses, makes eyeglasses more lightweight and luxurious. The radian of the PC foot board can fi