Rolls Sheets Tape Gaskets
SGL POLYCARBON manufactures flexible graphite foil in various forms for industrial applications: producing laminated homogeneous sheets, rolls, tapes and  gaskets reinforced with stainless steel or other material inserts. Our SIGRAFLEX brand is known world-wide.
Technical Advisory M&Y Factors
 
Technical Advisory Understanding Oxidation

Product Code Guide

Homogeneous Sheets and Rolls

SIGRAFLEX Grade B Standard Industrial Grade flexible graphite foil with 98.0% minimum carbon content. No binders, fillers or resins. For use as spiral wound gasket filler and in die-formed rings.
SIGRAFLEX Grade S Premium Grade flexible graphite foil with 99.0% minimum carbon content. No binders, fillers or resins.
SIGRAFLEX Grade N High Purity Nuclear Grade flexible graphite foil with 99.5% minimum carbon content. Can be certified to meet NEDC-31735P/D5OYP12 specifications. No binders, fillers or resins.
SIGRAFLEX Grade BP Standard Industrial Grade flexible graphite foil with an inorganic, non-metallic passivating inhibitor for oxidation and corrosion resistance.
SIGRAFLEX Grade SP Premium Grade flexible graphite foil with an inorganic, non-metallic passivating inhibitor for oxidation and corrosion resistance.
SIGRAFLEX Grade NP High Purity Nuclear Grade flexible graphite foil with an inorganic, non-metallic passivating inhibitor for oxidation and corrosion resistance. Can be certified to meet GE-NEDC-31735P/ D5OYP12 specifications

 

Homogeneous Tapes

B Tape

Slit, plain or corrugated, with or without pressure sensitive adhesive (PSA), from Standard Industrial Grade B.

S Tape Slit, plain or corrugated, with or without pressure sensitive adhesive (PSA), from Premium Grade S.
N Tape Slit, plain or corrugated, with or without pressure sensitive adhesive (PSA), from Premium Grade N.
SP Tape Slit, plain or corrugated, with or without pressure sensitive adhesive (PSA), from  Grade SP.
BP Tape Slit, plain or corrugated, with or without pressure sensitive adhesive (PSA), from  Grade BP.

 

Reinforced Laminates

B-LAM Grade Laminated sheets, .030-.180" thick, adhesive bond, no insert.
BTCSS Grade 316 stainless steel tang inserted laminate. Standard Industrial Grade B sheets mechanically bonded to tang sheet insert (0.004"), no adhesive.
BSSC Grade A laminate with flat 316 stainless steel insert, (0.002") made from Standard Industrial Grade B sheet, adhesive bond.
BSC Grade A laminate with 316 stainless steel wire mesh screen insert (24 wire/in.,0.0075" thick) made from Standard Industrial Grade B sheet, adhesive bond.
BHST Grade A laminate with either 0.002" or 0.003" Hastelloy C-276 made from Standard Industrial Grade B sheet, adhesive bond, (24"x24"only).
BHSTT Grade Hastelloy C-276 tang inserted laminate. Standard Industrial Grade B sheets mechanically bonded to 0.004" tang sheet insert, (24"x24"only).
BMY Grade Standard Grade B sheets adhesively bonded to a flat 0.0005" (standard) thick polyester insert. (also 0.002" available). Recommended for applications below 400F.
Hochdruck HD A multi-layer, adhesive-free laminate with high integrity 316 stainless steel foil reinforcement for extreme applications.
Hochdruck RS A high purity, multi-layer, adhesive-free laminate with low sulfur content. Can be certified to meet GE-NEDC 31735P/D5OYP12.
BGFC Grade A laminate with 0.0025" high temperature cloth/fabric reinforcement made with Standard Industrial Grade sheets.

PERFORMANCE ADVANTAGES

bulletNon-toxic
bulletExcellent thermal stability
bulletHighly anisotropic
bulletVery low thermal expansion characteristics
bulletLow electrical resistivity
bulletLow coefficient of friction
bulletHigh thermal conductivity
bulletLow modulus of elasticity, highly flexible
bulletEasy conformability to surface irregularities
bulletNon-abrasive
bulletLow gas permeability
bulletNuclear certifiable, high purity
bulletChemically inert

                                                                                                                                                     PRODUCT CHARACTERISTICS

Graphite Composition
Resistant to a wide range of temperatures, from -328F / -200C, to +5432F / 3000*C, (in inert atmospheres).
Resistant to a wide range of pressure changes.
Resistant to fluids with pH range of 0-14, except strong oxidizers.
Excellent weather and aging characteristics.
Low creep relaxation.
Seals easily under moderate bolt loads.

Inserts
Reduces gasket damage in handling and installation.
Extra strength when narrow cross section gasketing is required.
Useful for higher pressures.

No Binders
Eliminates potential fluid contamination from binder residue.
No gaseous decomposition products.

Variety of Densities and Sizes
Useful for a wide range of applications.

Chemical Resistance
Chemically resistant to a wide variety of materials. Call for specific application or comprehensive resistance chart.

                                                                                                                        TYPICAL PROPERTIES

Property Units Value
Bulk Density lb/ft (gm/cc) 70.0 (1.1)
Thermal Conductivity
"a" Direction (parallel to surface)
"c" Direction (normal to surface)

BTU-in/hr-ft F
BTU-in/hr-ft F
 
1532
48
Thermal Expansion
70-1800
(bulk density 1.7-1.9gm/cc)


10ֿ
6/ F


2.8 - 4.4
Hardness (Shore Scleroscope)
At 1.0 gm/cc
At 1.3 gm/cc

-
-

30
40
Tensile Strength
At 1.1 gm/cc and .015" foil


PSI


700 min.

Permeability
Air


cm/gm


<0.00002

Emissivity
At 932F


-


0.4

Sublimination Temperature
(does not melt)


F


6600

Temperature Limit (in air)

F

1000

Compression

40%

Recovery

20%

Creep Relaxation

<5%

                                                                                                                   SPECIFICATIONS

Temperature, min. -328F/-200C
Temperature, max.
In air:
In steam:
In reducing atmosphere:

+850F/+450C
+1200F/+650C
+5432F/+3000C
Pressure, max. 5,000 - 10,000 psi
P x T, max. 2,000,000
M-factor, stress 2
Y-factor, psi 1000
Maximum Stress 25,000 psi
pH Range 0-14 (few exceptions)
Standard Sheet Thicknesses** 1/32", 1/16", 1/8"
(030", 060", 120")
Standard Sizes**
Rolls:

Sheets:
 


20, 30, 40, 60" x 108'
20, 30, 40, 60" x 216'
Homogeneous and Laminated
40" x 40", 60" x 60"
Densities** 0.7 to 1.4 gm/cc

 

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