Postal Requirements

In this age of terrorism, many post offices are wary about sending anything though the mail that may be deemed dangerous. However,

Oil is NOT hazardous material!

It is safe and legal to send oil through the US Mail.

Return postage is now paid by Blackstone. The labels on our black mailers have a bar code on them. If you have that sort of label, and you’re mailing your kit from within the US, you’re all set; just drop the kit in the mail.

Note: we like supporting the USPS. However, sometimes samples can take a while to arrive. Most get here within a week. But it can sometimes take 3-4 weeks. Hang on to your tracking number so you can see where the sample is at if it doesn’t arrive at the lab in a timely fashion.

If your kits have the old labels, let us know and we will send you new labels.

If you are not using one of our kits to send in your oil: The post office should still accept your sample, because oil is not hazardous. If they insist that you pay for hazardous shipping, or that the sample must go by ground rather than air, please give them our post office letter (link below). It explains how our kits — and the oil itself  — conform to US Postal Regulations. If they still resist accepting your sample, have them call us at 260/744-2380. We may not be able to change their mind, but we can try.

Click here to access the Post Office Letter

Click here to see USPS regulations on mailing oil samples. The pertinent part of this link is part 343.1(b), Note: A liquid with a flashpoint above 200° F (93° C) is not regulated as a hazardous material and may be mailed subject to the general packaging requirements in DMM 601.1-7, provided it possesses no characteristics of another hazard class. (That’s your oil. Flashpoint above 200° F, with no characteristics of another hazard class.)

International customers: We regularly receive samples from Canada, Mexico, Australia, Great Britain, and other countries. Please consult your local post office for postage required to get your sample to the United States.

Canada Post says: If the item is going to the US and the US Customs says that it’s packaged correctly, then you can mail it.

Great Britain/Royal Mail says: As long as the oil samples are under a litre in volume and well packaged and placed in a leak-proof liner such as a sealed polythene bag, surrounded with absorbent material such as newspaper and sufficient cushioning material to protect each item from damage, that is all that is required. (Should the samples be in glass bottles, the package should also be marked as ‘fragile’.) Your UK customers should also have a sender’s address in the UK clearly visible on the outer packaging. More information and advice can be found on the Royal Mail website at the following  link:

Australia says: Everything our end indicates it is able to be sent, however we would recommend contacting the relevant customs authority and they will be able to provide advise of any regulations of the US accepting the item.

Send your sample to:

Blackstone Laboratories
416 E. Pettit Ave.
Fort Wayne, IN 46806

brown postal boxes clustered and stacked on the floor