The English Chemist Joseph Priestley gave it the title rubber in 1770 when he discovered it may be used to rub out pencil marks. Its major professional achievements came only once the vulcanization method was invented by Charles Goodyear in 1839. This gives CR rather superior weathering and heat resistance, https://beediadiamond.com/catalog/rubber-points
หัวเจียรหุ้มยาง Fundamentals Explained
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