A-A-52426 Hose And Hose Assemblies, Non-Metallic, Silicone, Polyester And Wire Reinforced (For Coolant And Heating Systems Of Diesel And Gasoline Powered Engines)This CID covers polyester and wire reinforced, silicone compounded, elastomeric hose and hose assemblies, for coolant and heating systems of diesel and gasoline powered engines, with a temperature range from -40 deg. F to +425 deg. F. All hose types are intended for severe service such as on cars, buses, heavy duty military and commercial trucks, military combat vehicles, and off-road earth moving equipment. Type I (1/2 inch inside diameter (ID) thru 1 1/8 inch ID) hose is intended for connecting hot water heaters to coolant circulating systems of ground vehicles. The hose and hose assemblies described in this CID are hereinafter referred to as "hose".

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Physical properties

Types I, II, IV

Type III

Inner Tube

Cover

Inner Tube

Cover

Original properties

Hardness, durometer, Shore A

50/70

N/A

55/65

N/A

Tensile strength, min, psi

800

800

1000

1000

Elongation, min, percent

200

200

250

250

Oven aging at temperatures noted, °F (72 hours)

350±5

350±5

350±5

350±5

Changes after 72 hours

Hardness, durometer, Shore A

-5 to +10

0 to +10

0 to +20

N/A

Tensile strength retained, min, percent

90

90

90

90

Elongation retained, min, percent

65

65

65

65

Oil immersion (change)

Volume, max, percent (70 hours at 212 °F)

0 to +40

0 to +40

0 to +40

0 to +40

Tensile strength retained, min, percent

60

60

60

60

Hardness, durometer, Shore A, max

0 to -20

0 to -20

0 to -20

0 to -20

Coolant immersion (change)

Volume, max, percent (166 hours at 235±5 °F)

0 to +10

N/A

0 to +10

N/A

Hardness, durometer, Shore A

±10

N/A

±10

N/A

Tensile strength retained, min, percent

70

N/A

70

N/A

Elongation retained, min, percent

75

N/A

75

N/A

Compression set, maximum, percent

35

N/A

35

N/A