The common straw stalk gasifier uses the purifier is becomes with the line pipe or the iron-covered welding, because the gasifier produces the tar, the moisture content ph value is an acidity, has the very strong corrosive action to the metallic material, generally will corrode the water leakage about 3 months, to leak the tar, the air leakage to discard the replacement, one year must replace multiple, the post-sale service is very difficult to do, will be many gasifier Production enterprise inextricability difficult problem, we invested more than 5 ten thousand Yuan to develop the special-purpose mold, used the engineering plastics injection molding to become, bears the strong acid, the strong alkali, guaranteed the long-term use.