Tengwei insists on the quality control from the source, and selectsthe high-quality source materials from well-known domesticand foreign brands.
Ash content：this requirement preventsloss of sponge fill performance
It is required that the ash content should be less than 4% ofthe weight under the 700 degrees Celsius.(International Standard)
Tengwei insists on using the material ofmeeting the international environmental standard.
All products will not add calcium carbonate, ensure thatash content lower than 0.5%.
TDI supplier: bayer
Bayer company is one of the mostwell-known 500 companies in the world . The company’s headquarters is in Leverkusen,
PPG supplier: shell
Royal Dutch/ ShellGroup of Companies, called “Shell”, at present, It is the largest oil company in the world,Meanwhile it’s also the largest retailer of automotive fuel and lubricants on aglobal scale. Business scope all over the world. businessin 140 countries around the world, and there are 90000employee, Oil and gas production account for 3% and 3.5% of world outputrespectively. As the largest industrialcompany in the
Catalyst Supplier: The AIRProduct, Momentive
Air Products Chemicals INC is major supplier ofindustrial gases, relatedequipment and services and chemicals. Company business scope all over theworld, and there are factoriesacross the
POP Supplier: Gaoqiaopetrochemical
Founded in November 1981, gaoqiao petrochemical corporationis a subsidiary of