Packing Group Determination for DOT and UN GHS by Corrositex and Metals Testing

The color of the liquid is used to characterize the corrosivity

The color of the liquid is used to characterize the corrosivity group.

Low Cost and Fast Turnaround on Packing Group Determination by Corrositex and Metals Testing

To legally ship corrosive materials, it’s critical to first evaluate the corrosivity of the materials and select the proper UN GHS packing group. G2MT Labs is one of the only labs to offer both skin and metal corrosion testing to satisfy the UN Globally Harmonized System (GHS) and many similar requirements (e.g. US DOT, US EPA, etc.).

Metal and Skin Corrosion Testing

For skin corrosion assessment to determine packing group, the Corrositex test is a internationally recognized standard that satisfies the UN Globally Harmonized System (GHS) for classifying skin corrosivity. We offer the Corrositex system, rather than any competing methods, because it is

  • (1) fast,
  • (2) quantitative,
  • (3) reproducible, and
  • (4) a safer and less cruel alternative than animal testing.
ASTM G31 Corrosion testing coupon analysis by G2MT Labs

ASTM G31 Immersion Corrosion Testing

And we complement the Corrositex analysis with the ASTM G31 immersion corrosion test for metals, one of the most commonly used corrosion tests worldwide. We have the required samples (aluminum and steel), equipment, and personnel ready to provide you results quickly. The testing will comply with the requirements of 49 CFR 173.137 (the DOT process for measurement of metal corrosion) for DOT Packing Groups and/or with UN Section 37 requirements for international shipping. We also provide testing per SW846 method 1110, the EPA test for corrosivity of liquid and non-aqueous waste materials.

For high-quality testing, competitive pricing, and expertise to assist you after testing, G2MT Labs is the right choice.


Skin Testing for Packing Group Assessment for UN GHS, US DOT/EPA, and OECD

For Packing Group determination of Class 8 Materials, skin testing is performed by a safe, cruelty-free method known as Corrositex that uses a simulated skin barrier to evaluate the penetration time of the material. A glass bottle filled with chemical detection fluid is capped with a synthetic biobarrier, and the corrosive solution is placed on top of the biobarrier. When the substance penetrates the barrier, the detection fluid changes color.

The time of penetration of the samples is recorded, allowing them to be grouped into Packing Group 1, 2, or 3 for US DOT and/or EPA compliance, internal use, or for marketing purposes.

Metals Corrosion Testing by ASTM G31 Immersion Testing for DOT, UN, and OECD Requirements

For metal corrosion analysis, the ASTM G31 method is used for the metals corrosion testing performed by G2MT Laboratories. Samples are typically tested for 48 hours (DOT) or 168 hours (UN/OECD) at a 55 Degrees Celsius in a special corrosion apparatus designed for these tests.  The corrosion rate and pitting results allow determination of the proper packing group, and also provide a good estimate of the expected corrosion rate of the materials in SAE 1020 steel and 7075-T6 aluminum container materials.

Additional Packing Group Determination and Testing Resources:

Regulatory Acceptance of Corrositex Testing

        Many government agencies accept Corrositex testing, and the list keeps growing

Department of Transportation – DOT-E 10904
Original exemption granted April 28, 1993
DOT Permit #10904, 12/10/2013 expiring 11/30/2017
          Download DOT Permit #10904-(PDF)
Consumer Product Safety Commission (CPSC)
Formal Acceptance, NIEHS press release dated 3/21/00
European Centre for the Validation of Alternative Methods (ECVAM)
Approval July 19, 2006
EPA Federal Register / Vol. 60, No. 142 Dermal Corrosion
Method 1120       June 13, 1997
Formal Acceptance,NIEHS press release dated 3/21/00

Food & Drug Administration (FDA)
Formal Acceptance, NIEHS press release dated 3/21/00
International Air Transportation Association (IATA)
Letter of acceptance dated December 17, 1993
National Institute of Environmental Health Sciences (NIEHS)
Endorsement dated 6/22/99
Occupational Safety and Health Administration (OSHA)
Letter of Interpretation dated March 3, 1994
Formal Acceptance, NIEHS press release dated 3/21/00
Transport Canada – Permit For Equivalent Level of Safety SU 4483
Original approval 8/14/96
Additional renewal 9/18/98
Additional renewal 1/15/01
Full Draize Replacement Acceptance 3/5/02
United Nations – Globally Harmonized System of Classification
United Nations (UN) (2013). Globally Harmonized System of Classification and Labeling of Chemicals (GHS). Fifth revised edition, UN New York and Geneva, 2013. Ch 3.2.