Description

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PEEK tube pipe is highly resistant to thermal degradation and attacks from both organic and aqueous media. It resists creep and retains dimensional stability at high temperatures and pressures, making it ideal for use in seal backup.

Our PEEK sealing materials for rotary, reciprocating, and static applications are formulated to provide optimal performance and service life in your designs. Our offerings range from virgin PEEK to precision blends that utilize the additive properties of carbon fiber, glass fiber, PTFE, and other fillers to meet specific temperature, pressure, speed, and wear requirements.

SNC Plastic offers extruded PEEK round bar/rod and tube stock, as well as a wide range of molded PEEK tube pipe in sizes up to 1000mm+ in diameter.

We can also produce finished PEEK parts according to your requirements. These include valve seat inserts, seat rings for Trunnion Mounted Ball Valve, Slab Gate Valve, Expanding Gate Valve, Floating Ball Valve, and more.

The Basics of Ball Valve Seat and Seat Insert Materials

Ball valves are critical for controlling the flow of fluid and pressure within a pipeline. However, their effectiveness and safety depend significantly on the seat insert material used.

Ball Valves

Whether in a petrochemical application where leakage could be devastating, or in a pharmaceutical laboratory where cleanliness is critical, ball valve seats must be reliable and robust. A ball valve consists of the valve body, body cap, stem, hollow ball, and the round ball valve seat.

The ball valve seat is responsible for sealing the fluid inside and distributing seating stress uniformly. In soft seat ball valve designs, either an elastomer or polymer is used as the seal and inserted into a metallic seat ring. This approach, compared to hard seat ball valves, provides good sealing action, is lightweight, and more cost-effective.

PEEK Seals are among the most robust polymer seals available. PEEK exhibits extremely high tensile properties and low deformation under load. As a result, PEEK machined seals remain very stable over extended periods, even under pressure, temperature, and chemical stress.

Valve Seat and Seat Insert Material Selection

SNC Plastic provides the most suitable valve seat material solutions for your application.

Material	Main Properties	Notes/Applications	Temperature Range
Virgin Natural PEEK	Excellent chemical resistance and mechanical properties at elevated temperatures. Unreinforced PEEK is a general-purpose material noted for its high elongation and toughness.	Valve seats, seat inserts, back-up rings, sealings	-40℃ to 260℃
Carbon fiber filled PEEK	Increased strength, stiffness, and stability at high temperatures. Good wear resistance and thermal conductivity.	Bearings, bushings, seals, thrust washers, valve plates	-40℃ to 260℃
Glass fiber filled PEEK	Excellent compression strength and stiffness and reduced expansion rates. Excellent chemical resistance.	Suitable for use in parts exposed to high static loads over long periods in high-temperature conditions.	-40℃ to 260℃
Bearing Grade PEEK	Low friction, low wear, high limiting PV, low mating part wear, and easy machining.	Bearings, bushings, pump wear rings, seals, thrust washers	-40℃ to 260℃
PTFE filled PEEK	Higher lubricity than Virgin PEEK and a low tendency to abrade counter surfaces at temperatures between 100℃ and 260℃.	Suited to sealing applications with start-stop or rotary motions at higher RPMs.	-40℃ to 260℃

PolyEtherEtherKetone (PEEK)

Maintains wear resistance and mechanical strength up to 260℃ continuous use. PEEK is the performance material of choice for aggressive environments such as high temperatures, wet processes, and heavy loads. It combines exceptional wear, chemical, and moisture resistance with very high strength, dimensional stability, and stiffness. PEEK can be continuously exposed to hot water or steam with no distortion, corrosion, or galling.

Unreinforced PEEK is noted for its high elongation and toughness. Glass fiber-reinforced PEEK offers increased strength, stiffness, and stability at high temperatures, while carbon fiber-reinforced PEEK provides excellent compression strength, stiffness, and reduced expansion rates. PEEK is easily machined to precise tolerances.

Properties

• Superior wear resistance and dimensional stability to 260℃ continuous use
• Excellent resistance to chemicals, steam, and hydrolysis
• Very low moisture absorption
• Very high thermal stability (V-O UL 94 rating)
• Superb flexural and torsional strength
• Abrasion resistant
• Good dielectric properties
• Good resistance to radiation
• Self-extinguishing

Applications

• Sliding and wear parts
• Food contact parts
• Gears
• Valve seats
• Pump wear parts
• Structural parts
• Appliance parts
• Bushings, bearings, seals, and rings
• Plug connectors
• Wafer carriers

Industries

• Chemical technology
• Mechanical engineering
• Energy industry
• Electronics
• Food technology
• Oil and gas industry
• Aircraft and aerospace technology
• Automotive industry
• Semiconductor technology
• Vacuum technology

Material Data Sheet

PEEK (polyetheretherketone) is a high-performance engineering plastic with outstanding resistance to harsh chemicals, and excellent mechanical strength and dimensional stability.

Item	Test Standard or Instrument	Unit	PEEK-N	PEEK-GF30	PEEK-CF30	PEEK-HPV
Color	–	–	Natural or Black	Natural or Black	Black	Black
Density	ISO 1183-1	g/cm3	1.3 ± 0.01	1.5 ± 0.01	1.4 ± 0.01	1.43 ± 0.01
Water Abs. (25℃, 24Hrs)	ISO 62	%	0.5	0.11	0.06	0.06
Mould shrinking percentage	3mm, 170℃, Flow direction	%	1.2	0.4	0.1	0.3
Mould shrinking percentage	Perpendicular to flow direction	%	1.5	0.8	0.5	0.5
Melting point	ISO 11357	℃	343	343	343	343
Distortion temperature	ISO 75-1/-2	℃	163	315	315	293
Continuous using temperature	UL 74685	℃	260	260	260	260
Glass transition temperature	ISO 11357	℃	143	–	–	–
Tensile strength (23℃)	ISO 527-2/1B/50	MPa	100	155	220	134
Tensile elongation (23℃)	ISO 527-2/1B/50	%	34	2	1.8	2.2
Bending strength (23℃)	ISO 178	MPa	163	212	298	186
Compressive strength (23℃)	ISO 604	MPa	118	215	240	150
Lzod impact strength (no gap)	ISO 180/U	KJm-2	No crack	51	46	32
Rockwell hardness	ISO 2039-2	–	99	103	107	102
Friction coefficient	–	μ	0.30-0.38	0.38-0.46	0.28	0.18
Dielectric strength	IEC 60243-1	KV/mm	18	19	–	–
Dielectric constant	IEC 60250	–	3.2	3.3	–	–
Surface resistivity	IEC 90093	Ω	1015Ω	1015Ω	3×106Ω	5×106Ω
Flammable level	UL 94	–	V-0 @ mm 1.5	1.5	1.5	0.75

NOTE: The data stated above are typical values intended for reference and comparison purposes only. They should not be used as a basis for design specifications or quality control. Testing under individual application circumstances is recommended.

* PEEK-N, Natural (Unfilled) PEEK

* PEEK-GF30, 30% Glass Filled PEEK

* PEEK-CF30, 30% Carbon Filled PEEK

* PEEK-HPV, 10% Carbon + 10% Graphite + 10% PTFE filled PEEK

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