Thermal Insulation Blankets and Covers

HALCO® manufactures and converts three families of high-performance hook and loop engineered for thermal insulation blanket strap service: stainless steel hook with aramid loop for extreme temperature and cryogenic applications, polyphenylene sulfide (PPS) hook and loop for high-temperature sewn assemblies, and FR woven nylon hook and loop for general-purpose flame-retardant blanket service. All three are available as roll goods, die-cut shapes, and converted parts for strap production — and any of the three can be supplied with a laminated, fire-retardant adhesive backing for applications requiring adhesive attachment.

Why hook and loop straps over traditional mechanical cinch straps

Removable insulation blankets stay in place for the long haul — they aren’t taken off frequently. What changes routinely is the strap. Straps need to be installed during initial blanket fitting, adjusted as the blanket settles or thermal cycles cause fit changes, and occasionally removed for maintenance access to the underlying equipment.

Hook and loop closures handle every part of that workflow without tools. Compared to traditional mechanical cinch straps with D-rings, buckles, or lacing wire, hook and loop:

• Installs faster — no threading through buckles, no wire-twisting, no tensioning tools
• Adjusts in place — peel, reposition, and re-engage to fine-tune fit without removing the blanket
• Releases instantly when maintenance access is needed, then re-engages just as quickly when work is complete
• Conforms to irregular geometry — valves, flanges, instrumentation, and complex equipment shapes that resist rigid hardware closures

For most thermal blanket fabricators, those workflow advantages translate to faster install times in the field, lower labor cost per blanket, and longer-lasting strap performance over the life of the installation.

Why specialty hook and loop is required for thermal blanket service

Standard nylon hook and loop softens above 200°F and degrades rapidly under thermal cycling. That experience is the source of a common misconception in the insulation industry that hook and loop “doesn’t work” on thermal blankets. The misconception is correct about the wrong material but wrong about the closure type — specialty fasteners built around stainless steel, PPS, and aramid solve the temperature, cycle count, and mechanical demands of thermal blanket strap service. The Halco products on this page are engineered specifically for that environment.

How removable insulation blankets are typically secured

Thermal blanket fabricators use three closure methods, often in combination:

• Stainless steel lacing wire — highest temperature rating, slowest installation. Standard for permanent, very-high-temperature service.
• D-rings with cinch straps — typically silicone-coated fiberglass or PTFE webbing. Durable, consistent compression, slower removal.
• Hook and loop — fastest closure, no tools required, conforms to irregular geometry. Standard on blankets that come off regularly for inspection and maintenance.

Hook and loop is most often used in combination with D-ring straps or lacing wire — the strap or wire takes the tension; the hook and loop closes the seam quickly and seals the overlap. Halco supplies the closure materials and converted parts for strap production for this combined system.

Halco’s three high-performance hook and loop solutions

HALCO® High Temp Stainless Steel Aramid Hook and Loop

Stainless steel hooks bonded to an aramid base, paired with an aramid woven loop.

• Continuous service: -76°F to 455°F (-60°C to 235°C)
• Self-extinguishing — FAR 25.853, FMVSS 302, B1-DIN 4102
• 1.7 lb/in peel, 24.7 lb/in² shear — highest engagement strength in the heat-resistant family
• Stainless steel hooks resist fatigue at high cycle counts; engineered for blankets removed and reinstalled regularly
• Common applications: cold-side chiller blankets, cryogenic service lines (LNG, LN₂, LOX), steam piping, refining, power generation, space and aerospace

Often evaluated as an alternative to Velcro® Brand Hi-GARDE® Hook 46 / Loop 8000.

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HALCO® Heat Resistant PPS Hook and Loop

Polyphenylene sulfide (PPS) construction. More conformable than stainless steel and easier to sew.

• Continuous service to 495°F (257°C)
• Meets FAR 25.853, FMVSS 302, BSS7239
• ~5.6 lb/in initial peel, ~14.2 lb/in² shear
• Woven construction holds engagement strength across thousands of cycles
• Available in widths up to 4″ in khaki and light grey
• Common applications: industrial piping, valve and flange covers, exhaust insulation, ARC-flash gear, high-temperature workwear

Often evaluated as an alternative to Velcro® Brand Hi-AIR® Nomex® Hook & Loop Tape.

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HALCO® FR HOOK AND LOOP

100% nylon woven hook and loop with a flame-retardant coating. Conventionally supplied in gray for thermal insulation blanket applications.

• Continuous service to ~250°F (~121°C)
• Meets FAR 25.853, FMVSS 302, NFPA, UL, CAL TB, and Mil-Spec AA-55126A
• 1.12 lb/in peel, 22.7 lb/in² shear
• 100% nylon woven for sewing durability Available in widths from 1/2″ to 7″ — gray standard for thermal blankets, with black, white, and 18 additional standard colors available
• Common applications: general-purpose FR thermal blankets, lower-temperature insulation jackets, removable covers on motors, pumps, compressors, and acoustical enclosures

The economical FR-compliant choice for thermal blanket service where temperatures stay below 250°F.

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Specifying a closure for a removable insulation blanket?

Visit any of the three product pages above to download a TDS and request a sample, and then talk directly with a Halco engineer about your application. Halco engineering support is grounded in service temperature, thermal cycling, substrate compatibility, and finished-strap construction — and most material recommendations can be turned around in a single conversation.

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Where Halco products are used in thermal blanket applications

Halco’s specialty hook and loop supports thermal blanket fabricators serving:

• Power generation — turbines, steam piping, valve covers, expansion joints
• Petrochemical and refining — vessels, reactors, exchangers, exhaust systems, flange covers
• Industrial process — plastic injection machinery, autoclaves, ovens, dryers, kilns
• HVAC and mechanical — chillers, cold-side blankets, condensate lines, AHU jackets
• Cryogenic service — LNG, liquid nitrogen, liquid oxygen, refrigerated process piping
• Marine and shipboard — engine room insulation, exhaust manifolds, generator covers
• Aerospace and space launch — thermal control blankets, cryogenic propellant lines
• Mine and tunnel ventilation — ducting jackets in extreme service environments
• Acoustical insulation — sound-attenuation blankets on motors, compressors, pumps

Why thermal blanket fabricators choose Halco

• Specialty inventory in stock — high-temp, cryogenic, and FR materials available for sample shipment same week from Hayward, California
• Custom slitting and die-cutting — widths from 1/2″ to 4″, custom shapes, custom strap lengths
• Sewn strap part fabrication — semi-finished strap-and-buckle assemblies with D-rings, edge binding, and engineered overlap closures
• REACH, RoHS, and California Prop 65 compliant — full regulatory documentation supplied with every shipment
• Engineering support — material selection guidance grounded in service temperature, cycling, substrate, and finished strap construction
• 3M Preferred Converter, ISO 9001 certified

FAQ’s: Hook and Loop for Thermal Insulation Blankets

Related Solutions

• HALCO® Heat Resistant PPS Hook and Loop
• HALCO® High Temp Stainless Steel Aramid Hook and Loop
• HALCO® FR Hook and Loop
• Custom Strap Fabrication
• Hook and Loop Performance Guide

HALCO® is a registered trademark of Halco USA. Velcro® is a registered trademark of Velcro Companies. References to Velcro® brand products are for comparative purposes only.