Semiconductor Grade O-Rings and Seals

O-rings and materials for the demanding applications found in the semiconductor and solar industry.

Semiconductor Solar and LCD Manufacturing

Semiconductor production environments can represent some of the harshest environments that o-ring seals can encounter. Processes can be very diverse from High heat, aggressive plasma, hot wet chemicals and Amines, and remote NF3 cleans, At Marco, we are experienced with the demanding applications found in the semiconductor industry. Our experts can assist you in selecting the best material or seal design to increase service life and predictability and reduce contamination, resulting in higher efficiency.


Through the years different elastomeric materials have been developed to successfully handle harsh conditions, such as Kalrez®, Chemraz®, Perlast® and others, Marco has developed its own brand name Markez® Perfluoroelastomer materials that are equivalent but offer a cost advantage to others.

In addition to Markez Perfluoroelastomers, Marco Rubber hold extensive inventory in Viton® FKM, Fluorosilicone, Viton® Extreme and more, Marco also offers a range of large vulcanized O-rings, we understand that sizes of process chambers have gotten bigger for Solar, LCD and Semiconductor manufacturing, we can offer O-rings that are several feet in diameter if needed using a range of different materials.

Common Materials

  • Markez® Perfluoroelastomers and
    Perlast® (Kalrez®, Chemraz® and Valqua® Equivalents)
  • Brown, black and white FKM (Viton®)
  • High Temperature Red silicone
  • EPDM in different colors
  • Polyurethane for belts
  • Blue Fluorosilicone for Ash and some etch application.
  • Vespel®, PEEK®, PTFE, Delrin® and more.

High Performance Plastic Materials

Semiconductor Processing: Materials Comparison

Compound #
Hardness (Shore A)
High Temp °F (°C)
Strong Acids
Hot Amines
Semicon Wet
Ultra Low Particles
Comparable Compounds
Black 75
Kalrez® 6375, 4079, 7075 Best value general purpose performance, higher temperature resistance, wide chemical compatibility
Black 75
Kalrez® 8900, 7075, 4079 Highest temperature FFKM with best long term compression set resistance up to 335ºC, short exposures up to 350ºC, Low outgassing, high purity. Wide range of chemical resistance, acid, solvent resistance
Black 75
Kalrez® 6375, 6380, 1050LF General purpose, good in most acids, solvents, improved hot amine and steam resistance with wide range of chemical compatibility.
Black 80
Kalrez® 4079 &7075 Wider temperature resistance range, general purpose high temp material.
White 75
Kalrez® 8575, 9500 & Chemraz® 513 Improved plasma resistance, higher purity, wider temperature range, low extractables.
Clear Amber 75
Kalrez® 6221, LS205 and Chemraz® 625 Higher purity clear translucent, semiconductor and laser grade material, excellent plasma resistance.
Clear 62
Kalrez® 8002 Higher purity amber tinted clear, same as Markez Z1407 but lower durometer for lower compression force for delicate applications.
Dark Brown 75
alrez® 9100 and Kalrez® 9300 Higher purity, dark brown, non-carbon black material. Improved high temperature range, excellent plasma resistance, and low outgassing.

Semiconductor, Solar and LCD Manufacturing: Materials Comparison

Compound #
Hardness (Shore A)
High Temp °F (°C)
Low Temp °F (°C)
Silicone (VMQ) Orange 70
Higher temperature resistant Silicone Great for Furnace and LPCVD applications.
Fluorosilicone (FVMQ) Blue 70
Blue Fluorosilicone for O3 and O2 Ash and some etch applications. Similar to Parker L1120.
Polyurethane (PU) Translucent 70
High performance 70 durometer Polyurethane, very pure and high abrasion resistance, good for wafer pads.
FKM Viton® (A) Fluorocarbon Black 75
Lowest cost highest inventory general purpose commodity FKM Similar to Parker V0747-75.
FKM Viton® (A) Fluorocarbon Brown 75
General purpose brown FKM, improved oxidation resistance, similar to Parker V884.
FKM Viton® (A) Fluorocarbon Black 75
Best FKM family chemical resistance, known as Viton® ETP, improved base, amines, ketones, MTBE, MEK, MIBK.
PTFE Solid (Virgin) Teflon® High Performance Plastic White N/A
General purpose extreme chemical resistant rigged plastic only seals in limited applications (consider FFKM).
FEP (Teflon®) Encapsulated Viton Black Core N/A
General purpose extreme chemical resistant FEP (Teflon®) cover with Silicone Solid core (consider FFKM).
FEP (Teflon®) Encapsulated Silicone Orange Core N/A
General purpose extreme chemical resistant FEP (Teflon®) cover with Silicone Solid core (consider FFKM).
PFA (Teflon®) Encapsulated Stainless Steel Spring Silver Core N/A
High performance extreme chemical resistant PFA (Teflon®) cover with Steel Spring core (consider Spring Energized PTFE Seals for critical applications).

The information on this page is to the best of our knowledge accurate and reliable. However, Marco Rubber makes no warranty, expressed or implied, that parts manufactured from this material will perform satisfactorily in the customer's application. It's the customer's responsibility to evaluate parts prior to use.

The temperature ranges presented on this page are approximations for dry air service only and should not be used to determine design specifications or end-use temperature limits. Actual temperature range of a compound in an end-use application is highly dependent on part type, hardware configuration, applied forces, chemical media, pressure and thermal cycling effects, and other factors. The most practical way of determining an end-use temperature range is testing in the actual application conditions. Consult a Marco Engineer for more details.


Marco offers any O-ring size with no tooling charges, we also offer X-rings also called Quad-Ring® Seals for dynamic applications in any material, and many of the popular semiconductor O-ring sizes are already tooled. We offer VAT bonded gates in Perlast® and some Markez® materials, we also offer some of the 200mm and 300 mm bonded slit valves in a replacement materials to Chemraz® and Kalrez®. There are many Shamban® and other spring energized seal products in the market that we could directly replace at half the price! Those are used on robot spindles, throttle valves and other locations.

Common Products

  • O-rings
  • X-rings
  • VAT bonded gates
  • KF fittings and accessories
  • PTFE Throttle valves
  • Wafer pad seals
  • PTFE seals and O-rings
  • SES spring energized seals
  • Giant size O-rings

Additional Products

  • Fasteners
  • High Vacuum Components
  • Centering Rings

High Performance Valves

Our valves will change the way you design and operate your equipment. Our on/off and flow control valves provide an elastomer free, all metal actuator for an increased temperature range. Since our valves can be custom made, the application possibilities are endless. New Semiconductor Processing concepts can be developed due to the ability of the valve and actuator to hold very tight vacuum, can operate in the heat zone, and many other possible uses.


Through years of experience we have developed a database and knowledge of most equipment in the Market, we can cross reference most OEM part number, Examples, Applied Materials Producer®, DPS, Emax®, HDP Ultima®, RTP, Centura®, P-5000, Lam Excellan®, TCP9600, 9400 Metal, Novellus Vector®, Altus®, Speed®, Sequel®, Tokyo Electron..etc. In addition to that we have worked with OEM manufacturer to develop new sealing methods to solve existing problems or for new designs.

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