1) Hot Head torch using MAPP gas and soft glass, the rose Didymium lens will give you filtration of the Sodium flare ,reasonable protection in the Ultra-Violet, but not very good in the Infra-Red wavelengths.

2) Pre-mix or surface mix torches using propane or natural gas/oxygen, on soft glass and working relatively small objects with Borosilicate, the AUR-92 will give you adequate protection in all the wavelengths, in addition to the added benefit of enhanced blue, green, and red spectrums.

3) Same as item #2 but using a larger size torch, and working Borosilicate glass on small to large items, such as small sculptures, the AGW -186 will be the best bet. The 186 lens is the basic AUR-92 that gives you all the protection you need in the UV,sodium flare and reasonably good filtration in the Infra-Red, but we cement on the another layer of glass Schott KG-3 that eliminates all the I R. This may be a little help to you.

If you go to our web site http://www.auralens.com click on products, then glassworkers... you will find all of our products as well as all the spectral responses for them. Our visor is one possibility for people with changing or difficult prescriptions. We offer a trial of the visor for people unsure of what they are looking for in protection.

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