![Rubber Accelerator by yusheng1](https://img.wattpad.com/cover/388647802-512-k570489.jpg)
#1
Rubber Acceleratorby yusheng1
https://www.yushengmax.com/products/rubber-accelerator/
Rubber accelerators are chemicals used to speed up the vulcanization process of rubber, transforming untreated na...
![Engineering by duncmacphun](https://img.wattpad.com/cover/267854050-512-k634310.jpg)
#2
Engineeringby Duncan MacPhun
Denis Papin built the first steam engine in 1705 and, by 1800, Boulton and Watt had built 451steam engines. In 1870, the British produced 4 million tons of coke for iro...
Completed