Can I continue to ship oil samples through the US Postal Service?
Yes. However, as before with any combustible liquid, there may be special requirements that must be met. Per the USPS Hazardous Material Standards, the different restrictions are broken up by the liquid’s flashpoint. The majority of samples that are sent in will have a flashpoint above 200°F (93°C). To ship combustible liquids within this class without restrictions, the liquid “must be properly and securely packaged to prevent leakage.” Another class, in which the samples may fall into, will be between 141°F (60.5°C) but no more than 200°F (93°C). To ship combustible liquids within this class has a few additional restrictions. 1. Ensure that the primary (clear) sample bottle is packaged securely within the outer mailing bottle. 2. Mark the mail piece on the address side with “ORM-D” or “ORM-D AIR,” as applicable. This must be marked near the shipping name. 3. Mark all items being shipped via surface transportation with “Surface Mail Only,” for air transportation, each mailing must clea
