Page 9 - Design Criteria.qxd

PTFE Products - Sigma™
Properties
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10
SIGMA 500 SIGMA 511 SIGMA 522 SIGMA 533 SIGMA 588 SIGMA 599
Material Description
Composition PTFE PTFE, Glass
Microspheres PTFE, Silica PTFE, Barium
Sulfate
PTFE, Barium
Sulfate PTFE PTFE, Glass
Microspheres
Color Blue Fawn White w/Off white
core Off white White White w/Blue core
Properties
Thickness
in (mm) 1/32 (0.8) 1/32 (0.8) 1/16 (1.6) 1/32 (0.8) 1/16 (1.6) 1/16 (1.6)
Density
lb/ft3 (g/cc)
87 (1.4) 137 (2.2) 125 (2.0) 180 (2.9) 70 (1.1) 86 (1.4)
ASTM F36 Compressibility
% 42 10 30 11 55 38
ASTM F36 Recovery
% 40 44 25 46 24 39
ASTM F152 Cross Grain Tensile Strength
psi (MPa) 1740 (12.0) 2175 (15.0) 1479 (10.2) 2260 (15.6) 1390 (9.6) 1810 (12.5)
ASTM F38-B Creep Relaxation
% 21.2 23.9 48 16.8 50 30
ASTM F37-A Sealability1
mL/hr 0.12 0.42 0.66 0.42 0.06 0.12
BS 7531 Nitrogen Gas Permeability
mL/min 0.02 0.01 0.00 0.01 0.01 0.02
Maximum Pressure 940 - 1230 psi (depending on thickness)
Maximum Temperature 500°F
Gasket Constants
ASME m 1.4 1.4 1.4 1.4 1.4 1.4
ASME y
psi (MPa) 1885 (13.0) 2320 (16.0) 1885 (13.0) 2320 (16.0) 1595 (11.0) 1885 (13.0)
PVRC Gb2
psi 4 209 472 115 - -
PVRC a2 0.804 0.356 0.25 0.382 - -
PVRC Gs2
psi 0.12 0.005 0.037 0.000065 - -
Product Designation
ASTM F104 Line Callout F456110E11M5 F452110E11M6 F455120E12M4 F452110E11M6 F428130E21M4 F456110E11M5
Applications
All ingredients in all SIGMA grades comply with FDA requirements, all Sigma products can be cleaned for
oxygen service.
Acids & caustics @
moderate concentra-
tions, Hydrocarbons,
Solvents, Hydrogen
Peroxide, Low bolt
loads, Glass lined
flanges, In place of
envelope gaskets
General service,
Strong acids,
Sulfuric acid,
Solvents,
Hydrocarbons,
Steam, Chlorine,
General Service
Hydrofluoric Acid,
Warped or glass
lined flanges, In
place of envelope
gaskets
Strong caustics,
Moderate acids,
Chlorine,
Hydrocarbons,
Food/pharmaceutical,
Aqueous HF
(Hydrofluoric Acid) @
max. conc. 49%,
Aluminum Fluoride
Pharmaceutical &
Food service, Glass
Lined, FRP,
Ceramic & Plastic
flanges, Distorted &
Damaged flanges;
HF
Glass lined & Plastic
flanges, Replace envel-
op gaskets, Strong acids
to Moderate caustics
Misapplications
Anhydrous HF, Fluorine, Molten alkali metals, i.e. molten sodium, Potassium, Lithium, Bromine trifluoride, Chlorine trifluoride
Hydrogen fluoride gas,
Aluminum fluoride
Hydrogen fluoride
gas, Hydrofluoric
acid, Black & green
sulfate liquors,
Caustic soda
Same as
Sigma 533
Aqueous HF
(Hydrofluoric Acid) @
conc. higher than 49%
Fluorine Hydrogen fluoride gas,
Aluminum fluoride
1 Fuel A 10 psi; Gskt Stress 1000 psi
2 1/16”