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 Post subject: Heat transfer company logo
PostPosted: Wed Aug 02, 2017 12:10 pm 
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Joined: Tue Jan 13, 2009 5:00 pm
Posts: 414
My discussion with an FR clothing vendor went like this:

Q:What kind of testing is performed on the FR Heat Transfers that are used?

A:The transfers we use are water based inks with no plastisol’s. Therefore, generally when applied to an FR garment the transfers take on the properties and characteristics of the FR garment. Independent laboratory testing performed on the transfers shows the results. Please see attached.

Attachment Summary: 1. Flame resistance conducted in accordance with ASTM D 6413, Standard Test Method for
Flame Resistance of Textiles (Vertical Test), before and after laundering.
2. Heat resistance conducted in accordance with ISO 17493, Clothing and equipment for
protection against heat -- Test method for convective heat resistance using a hot air
circulating oven, before and after laundering.
These results demonstrate compliance of the subject emblems to the requirements of ASTM F
2302. For the purpose of transfer films applied to flame-resistant fabric substrate, compliance is
based on afterflame time with absence of melting and dripping and heat resistance without
thermal shrinkage.

Q: Of course you are aware the hazard we are concerned with is arc exposure. I don’t see how the flame and heat resistance tests you describe prove the treated garment’s ATPV or EBT remains unaffected. Can you comment? Thanks.

A: There is no requirement to test emblems for an arc rating or how they affect arc rating because ASTM 1506 allows the use of non-FR emblems. The ASTM 2302 testing for heat resistance and flame resistance at least show that the emblem blanks are difficult to ignite.

I don't have access to the standards in question. Does 1506 really allow non-FR logos with no testing? Would the members here buy FR clothing from this vendor with the described logo? Thanks.

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 Post subject: Re: Heat transfer company logo
PostPosted: Fri Aug 04, 2017 10:00 am 
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Joined: Tue Oct 26, 2010 9:08 am
Posts: 1735
Location: North Carolina
The approach is sound.

ASTM 1959 for instance is NOT a test on PPE. It is a test on the cloth that the PPE is made out of. There are actual PPE tests but they are more for things like face shields.

70E specifies that incidentals like elastic bands on underwear and name tags don't count. The elastic bands are a little different but when it comes to name tags the underlying cloth won't sustain a flame and the thermal mass (calories) of the name tag won't make much difference. I know that a few manufacturers promote "arc resistant belts" which don't have any metal buckels but based on 70E's guidance this seems kind of pointless.

The key thing too is that even if it is under-rated, as long as the PPE doesn't sustain a flame, there is a very high chance (80%+) of survival since even if a second degree burn happens, the area is unlikely to exceed 25% of the body surface area. If it is the proper rating then we get to 90%+ survivability. So the vertical flame test really isn't a "PPE test" either but since it does show flame sustainability, it might not have an ATPV rating but could show that even "unrated" FR material will still fair pretty good in an arc flash even if it does burn as long as it doesn't continue to burn once the arc flash ends (not self-sustaining).

So in answer to the question...first off 70E discounts name tags altogether. Second from a practical point of view if the name tag were to melt/burn it's not really enough of an area to matter even if it were to cause a burn in such a small area. The surrounding PPE won't sustain a flame so the injury won't be larger than the size of the name tag. That's if it burns. The major concern here would be if it is made of some sort of synthetic material that could soak into the PPE and make it down onto skin. A vertical flame test is NOT an arc flash test due to the nature of the thermal energy but it does show whether or not the material will sustain a flame. And if it doesn't, it won't even reduce the ATPV in the area where the name tag is applied which is even better than say a pure cotton or even a polyester name tag.

Keep in mind that the "standard" is all contrived anyways and not necessarily as good as it looks. When we say for instance that the incident energy is 8 cal/cm2 and you wear an ATPV 8 shirt, what would be the incident energy at the cuffs? Or for that matter what is the incident energy at the hands holding the screwdriver that just arced? Is it still 8 cal/cm2, the value calculated at the "working distance" which represents the face/chest area? If you read IEEE 1584, it compares the calculated incident energy and the ATPV rating (a piece of cloth suspended vertically in front of an arc) and states that numerically according to the 300+ tests collected for the standard, about 5-10% of the time the incident energy exceeds the ATPV rating. So at least in theory, someone could receive a second degree or worse burn at the face/chest area so using the rather contrived calculations, there is still a 5-10% chance of not providing adequate protection. However the real world is that the PPE has worked every in burns occur but no fatalities. 70E and IEEE 1584 after all are a SURVIVABILITY standard, not a "NO INJURY" standard. However even if the PPE was under-rated, it still prevents burns to the vast majority of the body's surface area. So as long a the PPE doesn't continue to burn, even if it is under-rated, it is still going to protect against a fatality in virtually all cases because the area of exposure and the angle of incidence among other things isn't all that large.

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 Post subject: Re: Heat transfer company logo
PostPosted: Mon Aug 07, 2017 10:06 am 

Joined: Fri Jan 04, 2013 12:06 pm
Posts: 2
ASTM F1506-15 allows (in the Appendix X1, Nonmandatory Information) Para X1.2.5 Quote "Logos, name tags, and other heraldry, such as flag patches and company award insignia's, are used to identify the organization and individual. If these items are constructed of non-flame resistant materials (such as polyester or rayon), their overall area should be minimized on the garment. For example, large company logos across the back of the garment should not be applied. In addition, the use of several logo over the entire garment should be avoided." End Quote

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