SAE AMS3255

Description / Abstract: Form

This specification establishes the requirements for an expanded polytetrafluoroethylene (EPTFE) in the form of sealing tape, gaskets, or sheets requiring no mixing or curing.

Application

Classes 1, 2, 3, and 4 sealing tapes have been used typically for sealing aircraft access panels, pressure barriers, and mold line surface close-out panels where gaskets are required. Class 5 sealants have been used for sealing aircraft fuel access panels, fuel pressure barriers, and mold line surface close-out panels where sealants with resistance to continuous exposure to fuel is required. For all classes, usage is not limited to applications identified.

Classification

Sealing tapes are classified as follows:

Class 1: Continuous, Ribbed

Type 1: Standard Sealant Tape

Form 1: 0.012 inch (0.3 mm) thick with large bulb 0.091 inch (2.3 mm) thick and small bulbs 0.035 inch (0.9 mm) thick

Form 2: 0.020 inch (0.5 mm) thick with large bulb 0.098 inch (2.5 mm) thick and small bulbs 0.047 inch (1.2 mm) thick

Form 3: 0.051 inch (1.3 mm) thick with large bulb 0.126 inch (3.2 mm) thick and small bulbs 0.067 inch (1.7 mm) thick

Form 4: 0.059 inch (1.5 mm) thick with large bulb 0.138 inch (3.5 mm) thick and small bulbs 0.087 inch (2.2 mm) thick

Form 5: 0.012 inch (0.3 mm) thick with large bulb 0.091 inch (2.3 mm) thick and no small bulbs

Form 6: 0.020 inch (0.5 mm) thick with large bulb 0.098 inch (2.5 mm) thick and no small bulbs

Form 7: 0.051 inch (1.3 mm) thick with large bulb 0.126 inch (3.2 mm) thick and no small bulbs

Form 8: 0.059 inch (1.5 mm) thick with large bulb 0.138 inch (3.5 mm) thick and no small bulbs

Form 9: 0.012 inch (0.3 mm) thick with no large bulb and small bulbs 0.035 inch (0.9 mm) thick

Form 10: 0.020 inch (0.5 mm) thick with no large bulb and small bulbs 0.047 inch (1.2 mm) thick

Form 11: 0.051 inch (1.3 mm) thick with no large bulb and small bulbs 0.067 inch (1.7 mm) thick

Form 12: 0.059 inch (1.5 mm) thick with no large bulb and small bulbs 0.087 inch (2.2 mm) thick

Class 2: Continuous, Non-Ribbed

Type 1: Standard Strength Sealant Tape

Form 1: 0.012 inch (0.3 mm) thick

Form 2: 0.020 inch (0.5 mm) thick

Form 3: 0.039 inch (1.0 mm) thick

Form 4: 0.065 inch (1.65 mm) thick

Form 5: 0.079 inch (2.0 mm) thick

Form 6: 0.126 inch (3.2 mm) thick

Type 2: High Strength Sealant Tape

Form 1: 0.012 inch (0.3 mm) thick

Form 2: 0.020 inch (0.5 mm) thick

Form 3: 0.031 inch (0.8 mm) thick

Form 4: 0.039 inch (1.0 mm) thick

Form 5: 0.059 inch (1.5 mm) thick

Form 6: 0.024 inch (0.6 mm) thick

Class 3: Continuous, Non-Ribbed Moldable

Type 1: Standard Sealant Tape

Form 1: 0.05 inch (1.3 mm) thick x 0.15 inch (3.8 mm) wide

Form 2: 0.07 inch (1.8 mm) thick x 0.25 inch (6.4 mm) wide

Form 3: 0.09 inch (2.3 mm) thick x 0.32 inch (8.1 mm) wide

Form 4: 0.12 inch (3.0 mm) thick x 0.46 inch (11.7 mm) wide

Form 5: 0.21 inch (5.3 mm) thick x 0.59 inch (15 mm) wide

Form 6: 0.24 inch (6.1 mm) thick x 0.72 inch (18.3 mm) wide

Form 7: 0.30 inch (7.6 mm) thick x 0.81 inch (20.6 mm) wide

Form 8: 0.37 inch (9.4 mm) thick x 1.03 inches (26.2 mm) wide

Class 4: Gasket Material

Type 1: Standard Strength Gasket Material

Form 1: 0.020 inch (0.5 mm) thick

Form 2: 0.039 inch (1.0 mm) thick

Form 3: 0.062 inch (1.6 mm) thick

Form 4: 0.079 inch (2.0 mm) thick

Form 5: 0.126 inch (3.2 mm) thick

Grade 1: Sheet Material up to 80 x 80 inches (2032 x 2032 mm)

Grade 2: Die Cut Gasket up to 80 x 80 inches (2032 x 2032 mm)

Type 2: High Strength Gasket Material Form 1: 0.012 inch (0.3 mm) thick

Form 2: 0.020 inch (0.5 mm) thick

Form 3: 0.031 inch (0.8 mm) thick

Form 4: 0.039 inch (1.0 mm) thick

Form 5: 0.059 inch (1.5 mm) thick

Form 6: 0.024 inch (0.6 mm) thick

Grade 1: Sheet Material up to 18 x 80 inches (457 x 2032 mm)

Grade 2: Die Cut Gasket up to 18 x 80 inches (457 x 2032 mm)

Class 5: Fuel Resistant Sealant

Type 1: Standard Temperature, 194 °F (90 °C), Fuel Resistant Sealant

Form 1: 0.020 inch (0.5 mm) thick

Form 2: 0.031 inch (0.8 mm) thick

Form 3: 0.039 inch (1.0 mm) thick

Form 4: 0.059 inch (1.5 mm) thick

Grade 1: Sheet Material up to 80 x 80 inches (2032 x 2032 mm)

Grade 2: Die Cut Gasket up to 80 x 80 inches (2032 x 2032 mm)

Type 2: High Temperature, 356 °F (180 °C), Fuel Resistant Sealant

Form 1: 250 to 500 g/m2 Form 2: 500 to 750 g/m²

Form 3: 750 to 1000 g/m2 Form 4: 1000 to 1500 g/m²

Grade 1: Sheet Material up to 17.7 x 78.7 inches (450 x 2000 mm)

Grade 2: Die Cut Gasket up to 17.7 x 78.7 inches (450 x 2000 mm)

Grade 3: Continuous Non-ribbed Tape

Safety - Hazardous Materials

Shall be in accordance with AS5502 (1.1).