You just need to find a laboratory that has also practise in ASTM methods, usually they also perform all the environmenal tests. Usually there is a Standard about the test and methods and a Standard for apparatus, clearly they have to be certified and accredited to ISO 17025 - which is a must for all labs. If you tell the product, the Standard and where you are in the Globe, it will be certainly easier to help you.
Kind Regards,