In this age of terrorism, many post offices have become wary about sending anything though the mail that may be deemed dangerous. However,
It is safe and legal to send oil through the US mail. If the post office insists that you pay for hazardous shipping, or that the sample must go by ground rather than air, please give them our post office letter. It explains how Blackstone's oil kits — and the oil itself — meets all 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.
You might also try putting your sample in a padded envelope or small box and dropping it in a mailbox, so that it automatically goes into the system.
Postage for one sample is $3.14.
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: http://www.royalmail.com/personal/help-and-support/I-need-advice-about-wrapping-and-packaging
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.
We often receive samples from Canada, Great Britain, Australia, Mexico, and other countries without a problem. However, each country has its own rules and regulations regarding what can be sent through the mail.
If your country's post office won't allow you to send your oil sample through the mail, you might try giving them our post office letter. However, this letter only pertains to United States Postal Regulations. If your post office flatly refuses to accept the sample, try sending it via UPS or FedEx.
You should not have a problem sending your oil sample through the mail, as we regularly receive samples from other countries.