Lons
Fellow
Just my twopennerth from my experience in the semi finished plastics industry where we were distributors of Lexan polycarbonates and ICI Perspex acrylics though it was 30 years ago.
* I have no idea what the thickness of acrylic should be but ICI would be able to tell you if given the correct information as well as if CJ will attack the material or not once they have the chemical ingredients listed. Acrylic is subjected to stress when drilled and it must be done very carefully indeed or crazing is almost certain to occur around the drilled edges, same when it's machined.
* Polycarbonate will flex and therefore would have to be a lot thicker than acrylic under the same conditions, it is also soft and scratches very easily which is also a problem because it it more prone to chemical attack and degradation and scratches just speed that up. It is also subject to similar stresses as acrylic. IMO if there's any doubt about CJ then poly is not a suitable product.
You can get coated and laminated polycarbonated ( Used in P.O vans, armoured cars etc ) but extortionate if you could get it at all. I have a sample 50mm thick as used in USA presidental car and still don't know what the actual composition is
When used by the police it's there because it flexes and is sturdy enough to deflect people and missiles thrown but that's a very different job to that of a chamber lid.
* I have no idea what the thickness of acrylic should be but ICI would be able to tell you if given the correct information as well as if CJ will attack the material or not once they have the chemical ingredients listed. Acrylic is subjected to stress when drilled and it must be done very carefully indeed or crazing is almost certain to occur around the drilled edges, same when it's machined.
* Polycarbonate will flex and therefore would have to be a lot thicker than acrylic under the same conditions, it is also soft and scratches very easily which is also a problem because it it more prone to chemical attack and degradation and scratches just speed that up. It is also subject to similar stresses as acrylic. IMO if there's any doubt about CJ then poly is not a suitable product.
You can get coated and laminated polycarbonated ( Used in P.O vans, armoured cars etc ) but extortionate if you could get it at all. I have a sample 50mm thick as used in USA presidental car and still don't know what the actual composition is
When used by the police it's there because it flexes and is sturdy enough to deflect people and missiles thrown but that's a very different job to that of a chamber lid.
