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Notes: *These fibers degrade in hot, moist atmospheres; Dacron is affected most, Nomex next, nylon the least. tGlass is destroyed by gaseous HF at dew point temperatures.

These ratings are only a general guide: E = Excellent, G = Good, F = Fair, P = Poor.

Notes: *These fibers degrade in hot, moist atmospheres; Dacron is affected most, Nomex next, nylon the least. tGlass is destroyed by gaseous HF at dew point temperatures.

These ratings are only a general guide: E = Excellent, G = Good, F = Fair, P = Poor.

and finishes for fiberglass are being studied, as well as alternative fabrics such as Teflon, Nomex, Ryton, and felted glass (see Table 5.16.2).

Bag weave is significant because different weaves produce different types of filter cakes. Warp is the system of yarns running lengthwise in a fabric, and fill is the system running crosswise. The style, weight, thickness, porosity, and strength are factors to consider in weave selection. Finishes are a lubricant against abrasion and protect against acid and alkali attack. Teflon, silicon, and graphite are the most popular finishes.

—Gurumurthy Ramachandran

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