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Appendix F to Part 25 - LII / Legal Information Institute For fabrics, the direction of weave corresponding to the most critical flammability conditions must be parallel to the longest dimension. Each specimen must be supported vertically. The specimen must be exposed to a Bunsen or Tirrill burner with a nominal 3/8-inch I.D. tube adjusted to give a flame of 1 1/2 inches in height. The minimum flame ... Heaters | McMaster-Carr Choose from our selection of heaters, including over 3,200 products in a wide range of styles and sizes. In stock and ready to ship. Torches | McMaster-Carr With a needle-point flame, these kits are well-suited for use on electronics, plumbing, and small parts. They produce enough heat to weld steel up to 1/8" thick. TIG Torch Accessory Kits Tirrill burner parts