Negitive Response on UN Gap Test

Several tests are commonly referred to as Burn Tests or Burn Rate Tests. Among them are procedures, pictued on this page, from the UN Manual of Tests and Criteria for the Transportation of Dangerous Goods. They share the common purpose of examining potentially hazardous materials but are looking at different reactive hazards: oxidizing, flammability, dangerous when wet; and do so with different procedures.

Is it hazardous? The question comes up – or should – in many circumstances:

  • Product reformulation.
  • Change in packaging for storage, transport or sale.
  • A waste of complex or unknown origins.

The question might be asked to satisfy internal health and safety concerns. Compliance with complex transportation, environmental, health and safety issues at the state, national or international level might be the driver. So could the need to reduce cost while maintaining safe storage, transportation and packaging.

5.1 Solid Oxidizer Test

The Division 5.1 Solid Oxidizer Test
(5.1 UN Manual of tests and Criteria)
measures the potential of a solid
substance to increase the burn rate
or intensity of a combustible
substance (cellulose) when the two
are mixed thoroughly in two different
ratios. More about Solid Oxidizer Testing...

The risk to life and limb from even apparently benign or inert materials and articles is significant. Ignorance of the hazards or the regulations governing them is no defense against civil litigation or regulatory sanctions. Stresau Laboratory helps you manage these risks by

  • Defining the specific situations in which your material may undergo a violent reaction.
  • Measuring the degree and extent of danger the reaction poses.
  • Providing regulatory compliant solutions for the threat.

Stresau Laboratory works with manufacturers, package designers and other testing laboratories to answer these questions with a responsible, cost-effective protocol. It starts with what the customer knows about the material, article or waste. That information is validated and, if need be, additional testing completes the picture of the hazard and the proper management of that hazard. This management includes proper packaging, labels, storage, transport and handling.

Stresau Laboratory answers the questions on material hazard for explosives, flammables, oxidizers and corrosives. Stresau Laboratory often provides sub-contract support to packaging and materials testing organizations because, like our end-user customers, they need Stresau's expertise in the analysis of the particular hazards of explosive, reactive, pyrophoric or flammable materials.

Division 4.3 Water Reactivity Test

Division 4.3 Water Reactivity Test (4.3 UN Manual of Tests and Criteria) determines if a material could be classified as Dangerous When Wet. Read more about Water Reactivity Testing...

Hazardous waste clean-up contractors have used Stresau Laboratory HMT on-site to characterize the reactive hazards real-time as needed. Analytical laboratories call on Stresau to assess reactive hazards of samples before exposing laboratory personnel and delicate analytical equipment to reactive hazards. Stresau Laboratory does not perform testing for radioactive (Class 7) or Toxic and Infectious (Class 6) hazards but works with laboratories that do to provide a complete hazard characterization of a substance when needed.
Is it hazardous? Yes! If you don’t know the answer.

Division 4.1 Flammable Solid Test

Division 4.1 Flammable Solid Test (4.1 UN Manual of tests and Criteria) determines if a material will be classified as Flammable. For a material unlikely to be a flammable a prescreen test is conducted. Read more about Flammable Solid Testing...