Available Now: 2023 Schedule of Hazmat & RCRA Training

PHMSA Warning: Unapproved Hazmat Cylinders

Posted on 11/5/2019 by Roger Marks

On Friday, November 1, US DOT PHMSA posted a safety advisory notice warning of unapproved propane cylinders produced by a company called Metal Mate in Thailand. The cylinders bear the DOT specification markings “DOT 4E” or “DOT 4BA”—but the company is not approved by PHMSA to manufacture cylinders. The cylinders can be identified by the company name “Metal Mate” and an “MM” logo stamped into the cylinder collar.  

These cylinders must not be used to transport hazardous materials. DOT states that they may not perform to the DOT performance standards and may not be safe for commercial transportation or consumer use.


The unapproved Metal Mate cylinders have made their way around the globe: PHMSA found two cylinders in Australia marked “DOT 4E 240” which third party testing found may not perform to the DOT 4E standard. Unapproved cylinders were also found in Colombia and DOT believes the company shipped cylinders to Bangladesh and New Zealand.

Read more: What is DOT Specification Packaging?

DOT Hazmat Packaging Requirements

Under the 49 CFR Hazardous Materials Regulations (HMR), cylinders and other packagings designed to transport hazardous materials must meet rigid performance standards (in most cases).

For cylinders, these specifications are found in 49 CFR 178.35—178.75 and regulate every detail of manufacture: the type of materials used, the capacity, service pressure, closures, wall thickness, manufacturing method and more. The regulations also lay out requirements for testing cylinders to ensure they perform to specification.

While foreign manufactures can obtain approval from PHMSA to manufacture cylinders and perform required testing outside of the US, the company in the safety advisory did not get such an approval.

Save Your Seat for 2020 49 CFR, IATA DGR, and IMDG Workshops

Join experienced Lion instructors and develop the in-depth expertise you need to keep hazardous materials moving safely and in compliance—by ground, air, and vessel.

The Complete Multimodal Hazmat Shipper Certification Workshops return to Hartford, Boston, Central Jersey, Philadelphia, Orlando, Charlotte, and Houston in early 2020.
Hartford Jan. 7–10
Boston Jan. 13–16
Central NJ Jan. 13–16
Philadelphia Jan. 21–24
Orlando Feb. 4–7
Charlotte Feb. 18–21
Houston  Mar. 3–6 

Save your seat now or view the 2020 schedule here.

Tags: cylinders, hazmat packaging, hazmat shipping, PHMSA, UN packaging

Find a Post

Compliance Archives

Lion - Quotes

Lion's online training is more comprehensive, has better slides, and is a superior training experience than what I would get from other trainers.

Robert Brenner

District Environmental Manager

The instructor was very patient and engaging - willing to answer and help explain subject matter.

Misty Filipp

Material Control Superintendent

I like Lion's workshops the best because they really dig into the information you need to have when you leave the workshop.

Tom Bush, Jr.

EHS Manager

Best course instructor I've ever had. Funny, relatable, engaging; made it interesting and challenged us as the professionals we are.

Amanda Schwartz

Environmental Coordinator

Excellent job. Made what is very dry material interesting. Thoroughly explained all topics in easy-to-understand terms.

David Hertvik

Vice President

These are the best commercial course references I have seen (10+ years). Great job!

Ed Grzybowski

EHS & Facility Engineer

The instructor was very knowledgeable and provided pertinent information above and beyond the questions that were asked.

Johnny Barton

Logistics Coordinator

Lion courses are the standard to which all other workshops should strive for!

Brody Saleen

Registered Environmental Health Specialist

The course is well thought out and organized in a way that leads to a clearer understanding of the total training.

David Baily

Hazmat Shipping Professional

The instructor kept the class engaged and made learning fun. There was a lot of information to cover but time flew by. I will definitely use Lion in the future!

Chelsea Minguela

Hazmat Shipping Professional

Download Our Latest Whitepaper

Use this guide to help meet your OSH Act responsibilities to provide a safe, healthy workplace during a public health crisis.

Latest Whitepaper

By submitting your phone number, you agree to receive recurring marketing and training text messages. Consent to receive text messages is not required for any purchases. Text STOP at any time to cancel. Message and data rates may apply. View our Terms & Conditions and Privacy Policy.