FFKM O-rings

Welcome to learning about FFKM O-rings

Our Sunraz™ FFKM O-rings have a wide temperature range, chemical resistance in various harsh applications, and a long service life. These are high-performance sealing rings constructed of perfluoroelastomer rubber. FFKM is also very resistant to extreme temperatures (-10°C to +260°C). Some FFKM compounds can work above 330°C.

FFKM and PTFE have similar chemical and thermal resistance. It combines the advantages of a PTFE O-ring with the elastic qualities of an FKM O-ring.

Famous Trade names for FFKM

For FFKM, there are many renowned brands and trade names. Examples include DuPont™ Kalrez®, Chemraz®, PERFREZ®, Tecnoflon®, Simriz®, and Perlast®.

Kalrez®

The original and most renowned brand of FFKM (perfluoroelastomer) is Kalrez®, developed by DuPont. Kalrez® is the most famous FFKM in the world and widely used.

Chemraz®

Chemraz® is developed by Greene Tweed, known for extreme oilfield and harsh chemical sealing. O-rings, gaskets, and seals in demanding, highly corrosive environments like semiconductor manufacturing, oil and gas, and aerospace often use it.

PERFREZ®

PERFREZ® is a premier brand of FFKM custom sealing components manufactured by Applied Seals Co., Ltd. It is designed for extreme industrial environments and provides excellent chemical resistance and thermal stability, making it a cost-effective, high-quality alternative to brands like Kalrez® or Chemraz®.

Tecnoflon®

Tecnoflon® FFKM perfluoroelastomer seals offer the greatest quantities of performance of all FFKM elastomers. It is from the Syensqo company (a spin-off from Solvay).

Simriz®

By Freudenberg Sealing Technologies, noted for high-temperature and semiconductor-grade applications.

Perlast®

By Precision Polymer Engineering, which is widely used in demanding environments.

Advantages

The FFKM O-Rings provide the highest level of chemical and thermal resistance available in elastomer sealing materials. Their durability, low compression set and performance under extreme conditions make them a reliable choice for demanding industries. They are well-suited for use in chemical processing, pharmaceuticals and semiconductor manufacturing. Additionally, the O-Rings are available with FDA certification, making them compliant with strict industry standards.

Although the upfront costs are higher. But FFKM O-Rings offer long-term benefits such as reduced downtime, lower maintenance expenses and increased reliability.

Applications

FFKM O-rings and seals serve critical sealing applications where purity, high temperatures, chemical resistance, and maintaining sealing force are very important. As one of the most widely used seals, they are suitable for a variety of static and dynamic applications. Additional industries that rely on FFKM seals include:

• Oil & gas machinery with exposure to harsh environments.
• Medical devices requiring FDA and USP compliance.
• High-temperature processing equipment.
• Sealing in chemically aggressive systems.
• Semiconductor Processing
• Food & Beverage
• Pharmaceuticals
• Aerospace

More and more industries we can find them in.

Sunraz™ Chemical Resistant Grade FFKM

Equivalent to Kalrez® 6375, Chemraz® 505

Physical Properties	Test Method	CR750B	CR750W	CR756B	CR800B	CR900B	CR600W
Color	ASTM D2244	Black	White	Black	Black	Black	White
Hardness Shore A	ASTM D2240	75	74	76	80	90	60
100% Modulus (MPa)	ASTM D412	17.5	4.5	11.5	11	17	4.5
Tensile Strength at Break (MPa)	ASTM D395B	17.5	10	15.9	18	21	14
Elongation at Break (%)	ASTM D412	177	190	129	150	125	190
Compression set (%, 70 hr @ 200 °C)	ASTM D395B	22	25	20	24	30	18.8
Max Continuous Working Temp	-	230	250	175	250	250	250

Sunraz™ High Temperature Grade FFKM

Equivalent to Kalrez® 4079

Physical Properties	Test Method	HT750B	HT750W	HT900B	HT600W
Color	ASTM D2244	Black	Cream White	Black	White
Hardness Shore A	ASTM D2240	75	74	90	60
100% Modulus (MPa)	ASTM D412	6	4.5	13	3.2
Tensile Strength at Break (MPa)	ASTM D395B	14	7.5	16.5	10
Elongation at Break (%)	ASTM D412	260	260	110	190
Compression set (%, 70 hr @ 200 °C)	ASTM D395B	23	24	27	11
Max Continuous Working Temp	-	330	330	330	330

Sunraz™ Ultra-pure, Low Outgassing FFKM

Equivalent to Kalrez® 8100, 9100, 9300

Physical Properties	Test Method	UP650D	UP750D	UP800W	UP800W
Color	ASTM D2244	Transparent dark amber	Transparent dark amber	Cream White	White
Hardness Shore A	ASTM D2240	65	74	80	82
100% Modulus (MPa)	ASTM D412	3.3	6.2	4.7	8
Tensile Strength at Break (MPa)	ASTM D395B	12.9	17	11.6	12.8
Elongation at Break (%)	ASTM D412	210	250	300	180
Compression set (%, 70 hr @ 200 °C)	ASTM D395B	12.5	17	24.8	34
Max Continuous Working Temp	-	315	315	315	280

Sunraz™ FDA Standard FFKM

Equivalent to Kalrez® 6375

Physical Properties	Test Method	FDA800B	FDA800W
Color	ASTM D2244	Black	White
Hardness Shore A	ASTM D2240	75	75
100% Modulus (MPa)	ASTM D412	16	6
Tensile Strength at Break (MPa)	ASTM D395B	17.6	12
Elongation at Break (%)	ASTM D412	180	210
Compression set (%, 70 hr @ 200 °C)	ASTM D395B	17	27
Max Continuous Working Temp	-	250	250

Sunraz™ Low Compression Set, High Temperature FFKM

Equivalent to Kalrez® 7075

Physical Properties	Test Method	LC700	LC701
Color	ASTM D2244	Black	Black
Hardness Shore A	ASTM D2240	75	75
100% Modulus (MPa)	ASTM D412	10.5	8.9
Tensile Strength at Break (MPa)	ASTM D395B	15	12.5
Elongation at Break (%)	ASTM D412	180	181
Compression set (%, 70 hr @ 200 °C)	ASTM D395B	15	12.5
Max Continuous Working Temp	-	250	330