§ 183.516. Cellular plastic used to encase fuel tanks.
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/us/cfr/t33/s§ 183.516·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(a)Cellular plastic used to encase metallic fuel tanks must:
(1)Not change volume by more than five percent or dissolve after being immersed in any of the following liquids for 24 hours at 29 °C:
(i)Reference fuel B ASTM D 471 (incorporated by reference, see § 183.5).
(ii)No. 2 reference oil of ASTM D 471 (incorporated by reference, see § 183.5).
(iii)Five percent solution of trisodium phosphate in water; and
(2)Not absorb more than 0.12 pound of water per square foot of cut surface, measure under Military Specification MIL P-21929B.
(b)Non-polyurethane cellular plastic used to encase metallic fuel tanks must have a compressive strength of at least 60 pounds per square inch at ten percent deflection measured under ASTM D 1621 (incorporated by reference, see § 183.5), "Compressive Strength of Rigid Cellular Plastics".
(c)Polyurethane cellular plastic used to encase metallic fuel tanks must have a density of at least 2.0 pounds per cubic foot, measured under ASTM D 1622 (incorporated by reference, see § 183.5), "Apparent Density of Rigid Cellular Plastics." \[CGD 74-209, 42 FR 5950, Jan. 31, 1977, as amended by CGD 77-98, 42 FR 36253, July 14, 1977; CGD 81-092, 48 FR 55737, Dec. 15, 1983; USCG-2000-7223, 65 FR 40059, June 29, 2000\]