AA 59588 Silicones

AA 59588 SILICONES | SSP301| SSP1331T | ssp267
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AA 59588 Silicones for Aerospace and Defense 

SSP makes A-A-59588 silicones and supplies them as sheets, rolls, and ready-to-mold compounds.  

Elastomer

A-A-59588 Callouts

Product Specifications

Product No.

Class

Grade

Durometer (Shore A)

Tensile Strength (psi)

Elongation (%)

SSP2523T

3A

50

50

1493

807

SSP200T

3B

50

50

1280

660

SSP392T

3B

60

60

1280

650

SSP2521T

3B

70

70

1238

462
           

SSP390

2A, 2B

25

10 – 80

870 – 1475

700 – 1200

SSP220

2A, 2B

40

40

N/A

N/A

SSP301

2A, 2B

50

50

1100

450

SSP352

2A, 2B

60

60

1000

300

SSP389

2A, 2B

70

70

1000

250

SSP391

2A, 2B

80

80

1200

150
           

SSP278

1A, 1B

40

40

1000

500

SSP227

1A, 1B

50

50

1300

500

SSP122

1A, 1B

60

60

1100

500

SSP266

1A, 1B

70

70

1100

450

What is AA 59588? 

The A-A-59588 specification replaced ZZ-R-765E and is sometimes written as MIL SPEC AA-59588, AA 59588, AA59588, or A A 59588 instead. Within A-A-59588, the U.S. General Service Administration (GSA) divides compliant materials into six classes and durometer-based grades. 

Class

Description

Grades

1A

Low temperature resistant

40, 50, 60, 70, 80

1B

Low temperature resistant and low compression set at high temperature

  

2A

High temperature resistant

40, 50, 60, 70, 80

2B

High temperance resistant and low compression set

40, 50, 60, 70, 80

3A

Low temperature, tear and flex resistant

30, 50, 60

3B

Tear and flex resistant

30, 50, 60, 70, 80

AA 59588 Class 1A and Class 1B Silicones

AA 59588 silicones that meet the requirements of Class 1A or Class 1B are intended for use where resistance to extremely low temperatures is required. The A-A-59588 specification defines this as approximately -73°C (-100°F). 

Class 1 materials can also resist extreme high temperatures of approximately 210°C (425°F); however, their length of service at high temperatures is less than that of Class 2 materials. Note that Class 1B silicones have low compression set at high temperatures.

AA 59588 Class 2A and Class 2B Silicones

AA 59588 silicones that meet the requirements of Class 2A or Class 2B resist extreme high temperatures of approximately 219°C (425°F). They also have low temperature resistance, but only to about -62°C (-80°F). 

Unlike like Class 2A materials, however, Class 2B silicones have low compression set. In other words, they have high resilience.

AA 59588 Class 3A Silicones

AA 59588 Class 3A silicones provide resistance to extremely low temperatures of approximately -75°C (-103°F). Importantly, these military and aerospace silicones also resist tearing and flexing. 

AA59588 Class 3A silicones also resist extreme high temperature environments to approximately 204°C (400°F). Applications include engine mounts and exhaust hangars.

A-A-59588 Class 3B Silicones

AA 59588 Class 3B silicones also resist tearing and flexing, but their resistance to extreme low temperature is less than that of Class 3A materials. 

With A-A-59588 silicones that meet the requirements of Class 3B, the temperature range is approximately between -70°C (-95°F) and 204°C (400°F). Applications include aircraft door seals, window seals, and vibration mounts.

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