1. (a) Chemicals which meet all requirements as applied to standard exterior test fabric (Sections 1230 through 1239) will be approved for the treatment of any hard-surfaced cotton fabric such as duck, drill, twill, etc.

2. (b) Chemicals which meet all requirements as applied to standard interior cotton test fabric (Sections 1250 through 1263) will be approved for the treatment of any cotton fabric, plus linen, burlap, silk, wool, rayon, paper and Cellophane. Such chemicals may receive extended approval to treat additional fabrics as follows:

   1. (1) Fiber Mixtures Containing Not Over 35 Percent Synthetics. Supplementary tests for Weight Increase [FN*] (Section 1260) and Fire Resistance (Section 1261), only, on each appropriate standard mixed fabric (Cotton-Rayon-Acetate, Cotton-Rayon-Nylon, Cotton-Rayon-Dacron, etc.) for which approval is desired.

3. (c) Chemicals which meet all requirements as applied to standard synthetic test fabrics (Sections 1263.1 through 1263.9) will be approved on the following basis:

   1. (1) 100 Percent Synthetic (Acetate, Nylon, Dacron, Orlon, etc.). Tests shall be performed on each appropriate standard synthetic test fabric for which approval is desired.
   2. (2) Fiber Mixtures Containing Over 35 Percent Synthetics. Supplementary tests on standard interior cotton test fabric for accelerated aging, synthetics (Section 1263.7), only.

Approval of chemicals to treat various fibers will be based on the following:

Note: Report weight increase only, no limit specified.

History

1. New section filed 11-21-47; designated to be effective 12-22-47 (Register 10, No. 3).

2. Amendment filed 9-1-50; effective 30th day thereafter (Register 21, No. 5).

3. Repealer and new section filed 8-28-62; effective thirtieth day thereafter (Register 62, No. 18).

[FN*]