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Graphite packing 688
PTFE gasket
0.0 Yuan 0.0 Yuan
Product description
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Square braid, pure flexible graphite which has been expanded and made into a braidable yarn and treated with PTFE as a sealant.

Style 688 is available in the following cross-section range:
1/8" to 2" (3.0 mm to 50.8 mm)

 

 


Applications
Style 688 is suitable for steam, water, oil, solvents, alkalis, acids, and most chemicals. Exceptions are oleum, fuming nitric acid, aqua regia, and fluorine.
Style 688 is recommended for rotary and centrifugal applications. It is also excellent for valves and other static applications.

 

Performance
Rotary
Reciprocating
Valve
Max Pressure -psi bar kg/cm2
450/31/31.6
N/A
1500/103/106
4000/276/281*
Temp - °F/°C
in non-oxid. atm.
-300 to +6000°F 
(-184 to +3316°C)
N/A
-300 to +6000°F 
(-184 to +3316°C)
 
in oxid. atm.
-300 to +850°F 
(-184 to +454°C)
N/A
-300 to +850°F 
(-184 to +454°C)
 
in steam
-300 to +1200°F 
(-184 to +649°C)
N/A
-300 to +1200°F 
(-184 to +649°C)
pH Range
0 to 14
N/A
0 to 14
Max Speed  fpm (mps)
4500 (22.8)
N/A
200 (1)
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