Cloth is intended for use as protective material during welding and cutting operations.

Type I, classes 1 and 2 are suitable for stress-relieving operations. Type I, class 1 material is a pliable heavyweight fabric which provides thermal protection against metal encountered during welding or heavy cutting operations. Type I, class 2 material is a lightweight, very pliable fabric suitable for use in light welding applications where thermal shielding against weld sparks is required.

Type III material is coated to improve abrasion resistance, durability, and strength. This material tends to repel molten metal rather than retain the slag, and is used in less severe welding and cutting applications than is type I. Type III is for welder's curtains, and is limited to use in the vertical position. Signs should be posted in areas where welding is performed to warn passersby of possible ultraviolet reflection.