The English Chemist Joseph Priestley gave it the identify rubber in 1770 when he uncovered it may be used to rub out pencil marks. Its major business accomplishment came only after the vulcanization system was invented by Charles Goodyear in 1839. This provides CR reasonably excellent weathering and warmth resistance, Successfully Submitted (Awaiting Approval)
หัวเจียรยาง - An Overview
Internet 10 days ago paule714qye6Web Directory Categories
Web Directory Search
New Site Listings