Show the clip before passing round a piece of Bakelite. Give pairs of students a thermosetting or softening plastic currently in popular use today and challenge them to find details of its ...
Leo Baekeland. One of the first plastics made from synthetic components, Bakelite was used for its electrically nonconductive and heat-resistant properties in radio and telephone casings and ...
一些您可能无法访问的结果已被隐去。
显示无法访问的结果