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Expandable Braided Sleeving

MONOFLEX® PEEK is the ideal expandable sleeving for aerospace and automotive industries and is a biomaterial used in biomedical applications such as medical implants. Being made of the thermoplastic polymer Polyether Ether Ketone (PEEK) makes this particular sleeving ideal for environments that are very concerned with cleanliness. It easily tolerates several sterilization protocols and can withstand thousands of sterilization cycles. MONOFLEX® PEEK also does very well in high temperature environments and is inherently flame resistant. This self-extinguishing sleeving exhibits low outgassing and has high lubricity.

MONOFLEX® PEEK is currently unavailable for purchase online; please reach out through the button below for purchasing assistance from our Sales & Marketing Team or to learn more about the color variety and multiple sizes we offer.

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Features of MONOFLEX® PEEK

  • Maximum Operating Temperature: 260°C / 500°F
  • Performs well in High Temperature and High Abrasion Environments
  • REACH and RoHS Compliant
  • Lightweight with High Lubricity properties
  • Self-Extinguishing and Flame Resistant
Download MONOFLEX® PEEK Datasheet    

Testing Data for MONOFLEX® PEEK

Abrasion ASTM D-4060 8,000 cycles
Hardness (Shore D) ASTM D-2240 84.5
Heat Age @ 168 Hours ASTM D-3045 No Cracking, Melting, or Deformation
Limiting Oxygen Index ASTM D-2863 24%
Low Temperature Flexibility Below Freezing No Cracking or Deformation

Temperature Scale for MONOFLEX® PEEK

Maximum Operating Temperature 260°C / 500°F
Melting Point (ASTM D-3418) 343°C / 649°F

Monofilament Properties of MONOFLEX® PEEK

Single-Strand Diameter 0.010"
Density (ASTM D-792) 1.3 g/cc
Moisture Absorption (ISO 62-1) 0.07% - 0.45%
Single-Strand Tensile Strength 4 lbs. (minimum)
Outgassing Low Outgassing


The suggested application is provided by Atkins & Pearce merely as an additional tool to assist the customer in making an appropriate expandable sleeving selection. This is only provided to serve as suggestions of expandable sleeving that may be appropriate based on certain criteria and should not be relied upon as determinative or as a substitute for customer testing.

Many variables exist in a sleeve’s flexibilities, resistances, and treatment. Final sleeving product selection should always be confirmed through the customer’s own testing process to determine if a particular product is the correct choice for a particular system. Atkins & Pearce is not responsible for selections made by the customer using any of the reference material provided. For optimal performance in specific systems, we strongly recommend that customers conduct exhaustive electrical tests in their own lab and consider retaining samples for their future internal reference. The importance of expandable sleeving product testing and data validation cannot be overstated.

As the customer, you and your company are responsible for appropriately testing all Atkins & Pearce expandable sleeving used in your application and for making the final selection based upon meeting appropriate safety and electrical standards. Atkins & Pearce makes no representation or warranty, expressed or implied, at law or in equity, in respect of the information provided, including, without limitation, with respect to merchantability or fitness for any particular purpose, which representations or warranties are hereby expressly disclaimed.


1/8", 1/4", 3/8", 1/2", 3/4", 1"


Black, Natural

Sizes Available

1/8" 5/16" 0.025" 690.00'/lb. 1,000'
1/4″ 9/16" 0.025" 393.19'/lb. 1,000'
3/8" 5/8" 0.025" 262.13'/lb. 500'
1/2″ 1" 0.025" 127.22'/lb. 500'
3/4″ 1-3/8" 0.025" 87.38'/lb. 250'
1" 1-5/8" 0.025" 78.64'/lb. 250'
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