plastics

<...what composition the vendor/ fabricator has used ...>

A telephone call to the vendor/fabricator would do the trick.

Hi,

For selecting the correct materials, first you need to know the environmental requirements (temperature, strength, ambient exposure to chemicals, etc), and then you can A) consult with your raw-material vendor, or converter (sheet stock, etc.), or B) search sites of major brands (DuPont, Bayer, GE, etc.) and review their data sheets. Most are available either on-line, or by a downloadable PDF.

For confirming what your component supplier has given you, you can ask for a 'certification' sheet by shipment of what was used, and (more and more this is becoming a requirement) you can ask for an IMDS (international material data sheet) which, if done correctly, will show you by percentage and weight everything contained therein. This certificate or IMDS can be very important as most component manufacturers do at least SOME blending (colors, fillers, etc.) and that can radically change the nature of the base material. If you're using a component vendor who can't or won't supply you the data you need, my strong advice is to change vendors as soon as possible. Truly, this data is becoming more and more a requirement from YOUR customers, and if you can't be assured of the data, your company may be liable for defects and non-compliance of material content.

I hope this helps some.

Kind regards ...

You have to resort to the techniques of "Engineering Properties of Materials": the standard properties of every plastic material is known, so contrast your test values against the standard values to check for deviations from the standard values.