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Natural and synthetic yarns, fibers, spuns, monofilaments and cutflock specialities from the reliable source Swicofil 

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Natural fiber products - Swicofil's target products Synthetic fiber products - Swicofil's target products




Polyetheretherketone, also known as PEEK, has been mass-produced since 1962. It is a thermoplastic poly-condensate. 



PEEK has high tensile and flexural strength, high impact strength, and a high fatigue limit. High heat distortion temperature, high chemical resistance, and high radiation resistance. Good electrical properties, good slip and wear characteristics, and low flammability.

Specific Gravity 1.31
Melting Point  334°C
Max. working temperature 315°C
Flame rating UL 94 V0
Elongation 20-50%
Water Absorption,% 24hrs 0.150
Tensile Strength (Psi) 13'000 - 14'000
Tensile Elongation (%) 150.000
Dielectric Strength (V/Mil) 400
Dielectric Constant(@ 1 MC dry) 3.40
Dissipation Factor(@ 1 MC dry) 0.004
Arc Resistance (sec) 40
Volume Resistivity (ohm-cm)10E##  16.0
Heat Deflection Temp 264 psi (F) 340
Flammability V0
Thermal Expansion (In/In/F) x E-5 3.000


PEEK is a rather costly material, often used together with glass or carbon fibers, where high mechanical and thermal properties are required.


    customers use PEEK in high temperature applications where other fibres are unable to cope. PEEK performs well at operating temperatures up to 250°C and retains some properties at 300°C. It has low flammability, is self extinguishing and evolves the lowest level of smoke and toxic gases of any high tech fibre.
    customers use the chemical stability of PEEK to upgrade their processes. PEEK is insoluble in common organic solvents and has excellent resistance to alkalis and acids. It has very low moisture uptake and outstanding hydrolysis resistance, particularly in high temperature stream.
    customers benefit from a much longer component life, often in more rigorous running conditions. PEEK is tough yet flexible and has excellent impact/recovery characteristics especially when compared to steel.
    Not only does PEEK outlast existing fibres but it can often be fully recycled. In fact more than half of all fabrics woven with PEEK alone qualify for recycling and up to 90% of the material in these fabrics can be efficiently reclaimed to first grade polymer. This means that PEEK offers substantial economic and environmental benefits. 
    PEEK monofilaments are currently in use in open mesh conveyor systems for paper drying, textile printing, fabric heat setting, non-woven bonding and food processing... and the list is growing...

    PEEK multifilaments are already being used for aerospace components, thermoplastic composites and narrow weaving... and the list is growing...

    Combinations of PEEK monofilaments, multifilaments and staple fibers are being used for dry filtration and chemical separation as well as in the manufacture of sports strings, braids, brushes and cords... and the list is growing... 

  • racket strings
  • filtration fabric
  • sutures and other medical applications
  • dryer fabrics
  • conveyor belts
  • PEEK monofilaments are currently being used in open mesh conveyor systems for paper drying, textile printing, fabric heat-setting, non-woven bonding and food processing. PEEK multifilaments are being used for aerospace components, thermoplastic composites and narrow weaving.
    Combinations of PEEK monofilaments, multifilaments and staple fibers are being used for dry filtration and chemical separation as well as in the
    manufacture of sports strings, braids, brushes and cords.
  • flat yarn
  • monofilament
  • fibers
  • tow/tops
  • spun yarns




  1. Cost
  2. Anisotropic
  3. High processing temperatures


Background information



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Diameter/Profile mm Type
0.07 0.10 0.12 0.15 1110,1120
0.18 0.20 0.22 0.25
0.28 0.30 0.35 0.40
0.50 0.55 0.60 0.70
0.80 0.90 1.00 1.20 1110,1111
0.66 x 0.33 0.60 x 0.38 1110
0.15 0.22 0.25 0.35 2120,2320

Decitex/Filaments Type
75f15 150f30 3110,3120
115f15 230f30
275f15 550f30

Staple Fibre
Decitex Length mm Type
3.3 40, 60, 80 5110
13.0 80
25.0 80

mm thou m/kg yd/lb
0.07 3 200 000 99 200
0.10 4 98 000 48 608
0.15 6 43 556 21 604
0.18 7 30 247 15 002
0.20 8 24 500 12 152
0.22 9 20 248 10 043
0.25 10 15 680 7 777
0.28 11 12 500 6 200
0.30 12 10 889 5 401
0.35 14 8 000 3 968
0.40 16 6 125 3 038
0.45 18 4 840 2 400
0.50 20 3 920 1 944
0.55 22 3 240 1 607
0.60 24 2 722 1 350
0.70 28 2 000 922
0.80 30 1 531 760
0.90 35 1 210 600
1.00 40 980 486
1.20 47 681 338
0.66 x 0.33 26 x 13 3 500 1 736
0.60 x 0.38 24 x 15 3 300 1 637

General Properties
Property Type
Natural Colour Beige
Density 1.3g/cm3
Melting Point 334oC (633oF)
Glass transition temperature 143oC (289oF)
Maximum continuous service temperature 250oC (480oF)
Limiting Oxygen index 35%
Thermal conductivity 0.25W/m/oC
Heat capacity 1.30kJ/kg/oC
Resistivity 5 x 1016 ohm cm
UV Resistance Moderate
Radiation resistance Excellent

Type Number
Description Type
Low shrinkage for weaving 1110
Low shrinkage straightened 1111
Medium shrinkage for spiralling 1120
High tenacity and modulus 2120,2320
Low or medium shrinkage yarn 3110,3120
Crimped fibre 5110

Form Package Maximum kg (Ib)
Monofilament IEC 125 0.5 (1)
Monofilament IEC 160 1.0 (2)
Monofilament IEC 200 2.0 (5)
Monofilament IEC 250 4.0 (9)
Multifilament Cardboard tube 2.0 (5)
Staple Fibre Bale 5.0 (11)