Search

How DOT and OSHA Regulate Corrosive Materials

Posted on 1/21/2019 by Joel Gregier, CDGP

Safety professionals know better than most that the safety regulations created by agencies like US DOT and OSHA often don’t line up neatly. They may overlap in some areas, but diverge in others. 

Today, we’re talking about corrosives—and specifically, how the Department of Transportation (DOT) defines them in the 49 CFR Hazardous Materials Regulations (HMR) versus how the Occupational Safety and Health Administration (OSHA) defines them under its Hazard Communication Standard (HCS).

When you know how and why your materials are regulated by US DOT and OSHA, you are more prepared to make informed decisions about how to train personnel who encounter these materials and protect them on the job.

How US DOT Regulates Corrosives (Hazardous Materials Regulations) 

The DOT lumps all corrosive materials into one single hazard class: Hazard Class 8 Corrosives. There are two main ways to have a Class 8 material:
 
  • Materials that cause full thickness destruction of skin within 4 hours of exposure
  • Materials that corrode through steel or aluminum at least 6.25 mm (0.25 in.) a year at a test temperature of 55°C (130°F)
If you do have a Class 8 hazardous material, you will need to further classify the material by assigning a packing group to it, which tells you the relative severity of the hazard. The hazmat packing groups for corrosives are as follows:
 
  • Packing Group I (high hazard) = completely destroys skin ≤ 3 minutes of exposure time (within a 60-minute observation period)
  • Packing Group II (moderate hazard) = completely destroys skin > 3 minutes but ≤ 60 minutes of exposure time (within a 14-day observation period)
  • Packing Group III (low hazard) = completely destroys skin > 60 minutes but ≤ 4 hours of exposure time (within a 14-day observation period)
  • Packing Group III (low hazard) = corrodes steel or aluminum at least 0.25 in. per year

Ship hazardous materials? Join Lion for Complete Multimodal Hazmat Shipper Training and get up to date on the latest 49 CFR, IATA DGR, and IMDG Code regulations you must know to classify, package, mark, label, load, unload, and document hazmat/dangerous goods shipments of any class.

How OSHA Regulates Corrosives (Hazard Communication Standard) 

OSHA’s HazCom Standard uses the Globally Harmonized System (or GHS) to define hazardous chemicals. Under GHS, OSHA identifies three hazard classes for corrosives:
 
  • Skin corrosion/irritation
  • Serious eye damage/irritation
  • Corrosive to metals

Under OSHA regulations, a material may be assigned to multiple classes of corrosivity. These classifications do overlap a bit with the DOT definitions above, but there are few key differences.

For the “skin corrosion/irritation” hazard class, the big difference for GHS is that it includes irritants. GHS also does not use packing groups. Instead, it uses hazard categories to indicate relative severity.

For skin corrosives/irritants, these are defined as:
  • Category 1 = Causes full thickness destruction of skin within 4 hours of exposure time, (which matches the DOT Corrosive definition)
  • Category 2 = Skin irritants

Within Category 1 skin corrosives, GHS does have subclassifications (which align exactly with the DOT packing groups from above). They are:
  • Category 1A = same criteria as PG I = completely destroys skin ≤ 3 minutes of exposure time (within a 60-minute observation period)
  • Category 1B = same criteria as PG II = completely destroys skin > 3 minutes but ≤ 60 minutes of exposure time (within a 14-day observation period)
  • Category 1C = same criteria as PG III = completely destroys skin > 60 minutes but ≤ 4 hours of exposure time (within a 14-day observation period) 

The “serious eye damage/irritation” hazard class is something that does not have an equivalent in the DOT regulations (although many things that are corrosive to the eyes would also be a skin corrosive). This hazard class is broken up into two hazard categories:
  • Category 1 = causes irreversible effects on the eye
  • Category 2 = causes reversible eye irritation
For the “corrosive to metals” hazard class, the good news is that OSHA's criteria are identical to US DOT's metals PG III criteria (anything that corrodes steel or aluminum at 0.25 in. per year). There is only a single category for things that are corrosive to metal, so everything here would simply be Category 1.

If you would like to see more specific defining criteria, the full definitions can be found as follows:
  • DOT Corrosives = 49 CFR 173.136 and 137
  • GHS Skin corrosion/irritation = 29 CFR 1910.1200, Appendix A.2
  • GHS Serious eye damage/irritation = 29 CFR 1910.1200, Appendix A.3
  • GHS Corrosive to metals = 29 CFR 1910.1200, Appendix B.16


Hazmat Safety and OSHA HazCom Training

packaging-bottle-of-chemicals.JPGUse these new Lion.com online courses to prepare workers to safely handle, package, and ship corrosive chemicals in your workplace. The courses are designed to cover both DOT and OSHA safety training requirements and are available for a variety of materials:

HazCom: Corrosives
HazCom: Flammables and Combustibles
HazCom: Compressed Gases
HazCom: Poisons/Toxics
 
 
 

 

 

 

Tags: corrosives, GHS, hazard communication, Hazmat regulations, osha

Find a Post

Compliance Archives

Lion - Quotes

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

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

Genell Drake

Outbound Lead

This training broke down the regulations in an easy-to-understand manner and made them less overwhelming. I now feel I have the knowledge to make more informed decisions.

Amanda Oswald

Shipping Professional

The instructor was very dedicated to providing a quality experience. She did her best to make sure students were really comprehending the information.

Stephanie Venn

Inventory Control Specialist

I can take what I learned in this workshop and apply it to everyday work and relate it to my activities.

Shane Hersh

Materials Handler

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

I have over 26 years of environmental compliance experience, and it has been some time since I have attended an environmental regulations workshop. I attended this course as preparation for EHS Audits for my six plants, and it was exactly what I was looking for.

Frank Sizemore

Director of Regulatory Affairs

I attended training from another provider and learned absolutely nothing. Lion is much better. Hands down.

Nicole Eby

Environmental Specialist

Lion's course was superior to others I have taken in the past. Very clear in the presentation and the examples helped to explain the content presented.

George Bersik

Hazardous Waste Professional

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

Download Our Latest Whitepaper

This report details major changes for hazardous waste generators from US EPA’s Generator Improvements Rule, as well as the latest updates from states that are still working to adopt new, stricter Federal requirements.

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.