SIGRAFLEX Universal is a high-performing gasket sheet that is popularly used in several industries, such as chemical, petrochemical, power generation, refinery, and ship building. This gasket is constructed of flexible graphite foil reinforced with stainless steel and coated to stop leakage and enhance operational handling. In this post, we will look at the benefits of utilizing SIGRAFLEX Universal and the characteristics that make it a popular sealing solution.

1. The Advantages of using
SIGRAFLEX Universal
and its Properties
By Sealmax
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2. Introduction:
SIGRAFLEX Universal is a high-performing gasket sheet that is popularly used in several industries, such
as chemical, petrochemical, power generation, refinery, and ship building. This gasket is constructed of
flexible graphite foil reinforced with stainless steel and coated to stop leakage and enhance operational
handling. In this post, we will look at the benefits of utilizing SIGRAFLEX Universal and the characteristics
that make it a popular sealing solution.
www.sealmax.in

3. Advantages of using SIGRAFLEX Universal:
The below table shows different metrics of SIGRAFLEX Universal for several thicknesses and dimensions.
The data are based on the technical data sheet provided by SGL Carbon.
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4. The table shows that SIGRAFLEX Universal has a very consistent and high bulk density and purity of
graphite, resulting in excellent thermal and chemical resistance. It also has very low ash and chloride
levels, which make it, avoid corrosion and contamination effortlessly. It has mild compressible material
and recovery, which allows it to quickly comply to the flange surface and effectively seal gaps.
High operational reliability and increased plant availability: SIGRAFLEX Universal offers exceptional
resistance to corrosion, oxidation and medium, as well as superior blow-out resistance and mechanical
strength, leading in enhanced plant availability and operational dependability. It can withstand
temperatures from -269°C to 550°C and pressures up to 100 bar. It also has long-term compression and
recovery stability, even under high temperature shifts. These features guarantee that SIGRAFLEX
Universal can operate consistently and safely in a wide range of operating situations, reducing the
likelihood of failures and downtime.
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5. Good chemical resistance: SIGRAFLEX Universal has a low ash level and a high graphite purity, making it
less likely to react with the majority of substances and chemicals. It can withstand acids, alkalis, oils,
gasses, solvents, and steam, as well as corrosive mediums such as oxygen, propylene oxide, and ethylene
oxide. It also has a low total chloride concentration, further reducing the possibility of cracking due to
stress corrosion in stainless steel flanges.
Easy handling and assembly: SIGRAFLEX Universal is easy to handle and assemble because of its specific
impermeability, which provides exceptional durability against scratches and anti-stick qualities. It also
lacks significant cold or warm flow properties, therefore it does not distort or creep under pressure. It
has no adhesives or binders, so it does not age or become brittle with time. These features make
SIGRAFLEX Universal simple to cut, handle, and install, as well as remove and replace as needed.
Environmentally friendly and asbestos-free: SIGRAFLEX Universal is an adhesive-free and PFAS-free
gasket sheet, which means it does not contain any harmful substances that could leach into the
environment or pose health risks. It is also asbestos-free, which means it does not cause any respiratory
problems or cancer. SIGRAFLEX Universal is a sustainable and safe sealing solution that complies with
various environmental and health regulations.
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6. Properties of SIGRAFLEX Universal:
• High operational reliability, increased plant availability
• Excellent oxidation resistance
• High blow-out resistance and mechanical strength
• Very high fault tolerance during assembly and operation
• Good chemical resistance
• Long-term stability of compressibility and recovery, even under fluctuating temperatures
• Good scratch resistance and antistick properties due to special impregnation
• No measurable cold or warm flow characteristics up to the maximum permissible gasket
stress
• No aging or embrittlement (no adhesives or binders)
• Asbestos-free (no associated health risks)
↑ Gaskets made from SIGRAFLEX
UNIVERSAL
↑ Flange with SIGRAFLEX
UNIVERSAL gasket
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7. Material data of SIGRAFLEX® UNIVERSAL
Gasket factors (DIN E 2505 / DIN 28090-1)
Gasket width bD = 20 mm at an internal pressure of
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8. k0 x KD = σVU x bD k1 = m x bD
σVU/0.1 Minimum gasket assembly stress needed to comply with leakage class L 0.1 (according
to DIN 28090-1)
Recommended gasket assembly stress: ≥ 20 N/mm² up to σBO
σBU Minimum gasket assembly stress in service, where σBU is the product
of internal pressure pi and gasket factor m for test and in service (σBU = pi x m)
σVO Maximum permissible gasket stress at 20 °C σBO at 300 °C Maximum permissible gasket
stress in service m m = σBU /pi
„m“-factor Similar to m, but defined acc. to ASTM, hence different value
„y“-factor Minimum gasket stress in psi
k0 in mm, factor for gasket assembly stress
k1 in mm, factor for gasket stress in service
KD in N/mm², max. gasket stress-bearing capacity under assembly conditions
sKSW Compression set under a gasket stress of 35 N/mm²
sKRW Gasket recovery after reduction in gasket stress from 35 N/mm² to 1 N/mm²
sWSW Gasket creep compression under a gasket stress of 50 N/mm² at 300 °C after 16 h
sWRW Recovery after reduction in gasket stress from 50 N/mm² to 1 N/mm²
The percentage changes in thickness of sKSW, sKRW, sWSW und sWRW
are relative to the initial thickness. www.sealmax.in

9. Conclusion:
SIGRAFLEX Universal is a versatile and reliable gasket sheet that offers many advantages and properties
for various sealing applications. It is suitable for all common pipework and vessel flange designs, and can
handle high temperatures, pressures, and corrosive media. It is also easy to handle and assemble, and
environmentally friendly and asbestos-free. SIGRAFLEX Universal is a superior sealing solution that can
improve the operational reliability and efficiency of your plant.
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10. Contact Us!
Address: 119/120, Raj Prabha Land Mark Industrial Estate, 1st Floor, Building no.3, Gokhivare Village,
Bhoidapada, Vasai (E), Dist. Palghar
Phone No: +91 8983059377 / +91 8983059366
Email ID: admin@sealmax.net & sales@sealmax.net
Visit Now: https://www.sealmax.in/
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