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Materiel cert versus C of C for plastic

RJT

Titanium
Joined
Aug 24, 2006
Location
greensboro,northcarolina
I have requested 2 of my plastic suppliers (industrial distributors) to supply material certs for some poly carbonate and Delrin when we asked for a quote and reminded them we needed certs when we placed the purchase order. Both of them furnished a certificate of compliance which says it conforms to an ASTM spec. Normally, when I ask for a cert from my steel supplier, I get a traceable lot chemical analysis type certification. Waiting to hear back from my plastic suppliers,but wondering is this the norm with plastic?
 
They can get manufactures carts . They will tell you they need to know when you order the material but unless they’re sloppy with there paperwork they can still get them . You should talk to other suppliers
 
Same as others describe above for plastics. I prob misunderstood my distributors explanation when I asked, but I think they explained that material testing is not done as often on plastic and not available unless specifically asked from manufacturer at time of manufacture, in conjunction with a very large order... all my customers accept the CofC just fine on plastics.
 
As most have said, c of c is the norm with plastic according to my suppliers. My customer will accept it so I'm all set.

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Same as others describe above for plastics. I prob misunderstood my distributors explanation when I asked, but I think they explained that material testing is not done as often on plastic and not available unless specifically asked from manufacturer at time of manufacture, in conjunction with a very large order... all my customers accept the CofC just fine on plastics.

Yes, that's the basic gist of plastics manufacturing certification. I am speculating, but I imagine that the difference in certs between metals and plastics is most likely a function of the application differences, where many metals perform basic structural functions (conceptually, life safety), and this is relatively rare for a plastic material application. I worked in plastics fabrication and distribution in my early years, mid-70's to mid-80's, and never had an application or customer request that involved specific lot testing, other than the manufacture of windows for passenger train cars, which also required hot-stamping a Federal Railroad Administration marking into the polycarbonate windows. That was a case of large lots of material needed, and material certs required.
 








 
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