For the Model 36, they sought to design a revolver that could fire the more powerful .38 Special round in a small, concealable package.
Since the older I-frame was not able to handle this load, a new frame was designed, which became the Smith & Wesson J-frame.
Some are also designed to naturally degrade after use. "Attitudes are evolving," said David Eyton, the head of technology at BP.
Top producers include Sao Paulo-based Braskem, Nature Works in the U. "The question that faces the petrochemicals industry that has yet to really be answered is, 'How are people going to deal with some of the environmental impacts of petrochemicals?
The new design was introduced at the International Association of Chiefs of Police (IACP) convention in 1950, and was favorably received.