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

The instructor was very very informative, helpful, understandable and pleasant. This course answered many questions I had, being new to this industry.

Frances Mona

Shipping Manager

Lion Technology workshops are amazing!! You always learn so much, and the instructors are fantastic.

Dorothy Rurak

Environmental Specialist

Lion is at the top of the industry in compliance training. Course content and structure are updated frequently to make annual re-training enjoyable. I like that Lion has experts that I can contact for 1 year after the training.

Caroline Froning

Plant Chemist

My experience with Lion training, both online and in the classroom, is that they are far better organized and provide a better sequential explanation of the material.

Robert Roose

Manager, Dangerous Goods Transportation

The instructor did an excellent job presenting a very dry subject; keeping everyone interested and making it enjoyable.

Marc Bugg

Hazardous Waste Professional

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

David Hertvik

Vice President

Attending Lion Technology classes should be mandatory for every facility that ships or stores hazmat.

Genell Drake

Outbound Lead

I have been to other training companies, but Lion’s material is much better and easier to understand.

Mark Abell

Regional Manager

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

Ed Grzybowski

EHS & Facility Engineer

Lion is easily and consistently the best option for compliance training. I've learned new information from every instructor I've had.

Rachel Mathis

EHS Specialist

Download Our Latest Whitepaper

Some limited quantity reliefs are reserved for specific modes of transport. Use this guide to identify which reliefs you can capitalize on, and which do not apply to your operations.

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.