A-A-52047 Tubing, Nonmetallic Rubber And PlasticThis commercial item description CID covers the general requirements for tubing, nonmetallic rubber and plastic. Tubing, nonmetallic rubber and plastic covered by this CID is intended for commercial/industrial applications.

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A-A-520470

TABLE IV. Physical properties. 1/

Property	Type I	Type II	Type III	Type IV	Type V	Type VI
Specific gravity (maximum)	1.4	---	---	---	0.97	---
Tensile strength: Initial (psi) (minimum)	2400	1100	1200	3500	3000	2000
After air heat aging (7 days) (% of initial) (minimum)	75	75	75	75 1/	75	---
After 14 days immersion in a 3% salt solution at 82 °F (28 °C) (psi) (minimum)	---	---	---	---	---	2000
Ultimate elongation: Initial (%) (minimum)	650	450	400	750	700	300
After 14 days immersion in a 3% salt solution at 82 °F (28 °C) (%) (minimum)	---	---	---	---	---	300
Tensile stress at 100% elongation (psi) (maximum)	150	200	300	---	125	800

1/ Except that type IV tubing, 0.125-inch inside diameter, shall retain a minimum of 65% of its original strength.

3.2.3 Ultimate elongation.

3.2.3.1 Initial. The tubing shall have an initial ultimate elongation as defined in table I, when tested in accordance with ASTM 0412.

3.2.3.2 Immersion. The tubing shall have a tensile strength as defined in table I, when tested in accordance with

ASTM 0543.

3.2.4 Tensile stress at 100% elongation. The tubing shall have a maximum tensile stress at 100% elongation as defined in table IV, when tested in accordance with ASTM 0412.

3.3 Electrical conductivity. When specified (see 7.4), the tubing shall be electrically conductive. The maximum resistance value over a 3-foot section of electrically conductive tubing shall be 1.0 megohm when tested in accordance with the applicable procedures specified in NFPA 99 except that the electrodes shall be attached at or near both ends of the tubing, before and after exposure to oxygen aging, liquid ethyl ether, oil immersion, and flexing.

3.3.1 Oxygen aging. The two 3-foot lengths of electrically conductive rubber tubing shall be aged as specified in

ASTM 0572 for a period of 94 ±1/2 hours.

3.3.2 Liquid ethyl ether. The two 3-foot lengths of electrically conductive rubber tubing shall be maintained for 5 hours full of ethyl ether in the liquid phase.

3.3.3 Oil immersion. The two 3-foot lengths of electrically conductive rubber tubing shall be immersed in oil conforming to ASTM 0471, No. 2, for 120 hours at a temperature of 73.4 ±3.6 °F (23 ±2 °C).