October 17, 2017

 

Mr. Jonathan Gurten

QA Manager

AccuBeat Ltd.

Ha-Marpe 5

Jerusalem  977405

Israel

 

Reference No. 17-0018

 

Dear Mr. Gurten:

 

This letter is in response to your February 16, 2017, email requesting clarification of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to the classification of a hazardous material.  Specifically, you indicate that your company designs, develops, and manufactures Rubidium oscillator/Atomic clocks containing less than one (1) gram of rubidium and ask if it meets the definition of a Class 4 hazardous material.  You note that a previous PHMSA interpretation (Reference No. 08-0154) indicates that when less than one gram of rubidium is contained in an atomic clock it does not pose a risk during transportation and is not subject to the HMR.  Furthermore, you conducted test data of both an impact and drop simulation, which was provided to us.  The results of the test demonstrate no evidence of spontaneous combustion or damage to the capsule or the oscillator.

 

In accordance with § 173.22, it is the shipper’s responsibility to class and describe a hazardous material in accordance with Parts 172 and 173 of the HMR.  Note that previous interpretations were not a determination of whether rubidium is a Class 4 hazardous material but whether the amount and form in which it is transported presents an unreasonable risk to health and safety or property.  This Office does not generally perform this function.  However, based on the subsequent test data you have provided and previous PHMSA interpretation, it is the opinion of this Office that as long as the one gram or less of Rubidium in your atomic clock is hermetically sealed in glass, and the glass capsule is adequately protected from breakage and is an integral internal component of the atomic clock, and the atomic clock does not meet the definition of any other hazard class, it is not subject to the HMR. 

 

I hope this information is helpful.  Please contact us if we can be of further assistance.

 

Sincerely,

 

 

 

Dirk Der Kinderen

Chief, Standards Development

Standards and Rulemaking Division

 

173.22