UL94 tests and reading manufacturers datasheets

[ColinScowen]

I searched the forums for this question, couldn’t find anything that gave a good enough answer. So, it becomes a new thread.

As I understand the UL94 standard, for flammability, there are grades (HBR, V2, V1, V0), and a material sample of a given thickness will be tested, and then given a rating based on how it behaves in the test.

When I read a manufacturers data sheet for a material, and I see that the material is UL94-V0 at 1.6mm, am I right in thinking that this means that at thicknesses above 1.6mm the sample also achieved V0?, and that at thicknesses below 1.6mm it does not achieve V0? Or is the manufacturers data sheet only specifying the test samples that were submitted at the time they applied for the yellow card?

I am asking this because we are working with a material supplier to develop a material for a customer, whose drawings show a requirement for UL94-V0 (could well be a standard drawing note, applied arbitrarily) and whose cad does not show any wall thicknesses less than 1.6mm. Their existing materials data sheet list 1.6 and 0.4mm. I am thinking that for this project, we would not need to get the material to have V0 rating at 0.4mm thickness. Is that reasonable?

 

[btrueblood]

It meets the requirements for thicknesses at or above the thickness tested. For your customer to get 0.4 mm thick material to meet the standard, they will need to have it verified by a separate burn test.

Whether that matters to your customer is not clear.