Rubber - Processing, Synthetic, Natural | Britannica
https://www.britannica.com/science/rubber-chemical-compound/Development-of-the-natural-rubber-industry
WEBRubber - Processing, Synthetic, Natural: If latex is allowed to evaporate naturally, the film of rubber that forms can be dried and pressed into usable articles such as bottles, shoes, and balls. South American Indians made such objects in early times: rubber balls, for instance, were used in an Aztec ceremonial game (called ollama) long before ...
DA: 100 PA: 61 MOZ Rank: 25