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Techflex® Spark Plug Boot Insulators

Fiberglass Spark Plug Ignition & Wire Protectors - Max Temp 1200ºF

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Insultherm Spark Plug Boot Insulators

  • Resin Coated Fiberglass
  • Will Not Burn or Support Combustion
  • Easy, No Tool Installation
  • Operating Temps: -94°F to 1,202°F (-70°C to 650°C)
  • Extremely Abrasion and Cut Resistant
  • Resists Common Chemicals & Solvents
  • Available In 4 Colors
  • Melt Temp: 2,048°F / 1,120°C
  • Inside Diameters Are Measured as Round Not Flat
See More Technical Specifications


Insultherm braided fiberglass sleeving has been the first choice among automotive professionals and enthusiasts alike for many of their thermal protection applications. These innovative sleeves offer the same high temperature protection in an easy slip on sleeve that will extend the life of expensive spark plug wires by protecting them where they need it most... at the boot. Just slip these 3/4” diameter double thickness (triple thick at the sewn end) sleeves over any spark plug cable and boot (even right angle boots) to protect them from engine temperatures up to 1,200°F. Once installed, the sleeves require no clearance from hot surfaces, and can even rest directly on hot exhaust headers without affecting performance. Insultherm Spark Plug Boot Sleeves are completely non-conductive, resist all engine chemicals, will not support combustion, and provide an easy, economical solution to the challenge of wire protection in the cramped, high temperature environment of any high performance engine compartment.

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Are we missing the specification you need? Please go to our Contact Us page and submit your question to us, or call 1-877-284-7760

Nominal
Size
Product
Part #
Diameter Wall Thickness Bulk Box Colors
No Ring-Easy Install
4 1/2"
7 1/2"
12"
FBN0.75
FCN0.75
FDN0.75
3/4"
3/4"
3/4"
.085"
.085"
.085"
144
144
144
**
With Ring
7 1/2" FCU0.75 3/4" .085" 144 4

**NT in-stock color; all other available by special order only NT, BL, BK, RD 

Physical Properties
Monofilament Thickness (ASTM D-204) NA
Flammability Rating VW-1
Recommended Cutting Scissor
Colors 4
Wall Thickness .085
Tensile Strength - Yarn (ASTM D-2265) lbs. NA
Abrasion Resistance High/td>
Specific Gravity 1.0 - 1.8
Moisture Absorption % (ASTM D-570) .01

 

Hard Vacuum Data (ASTM E-595 at 10-5 torr)
TML .02
CVCM .01
WVR .00
Smoke D-Max (ASTM E-662) NA
Outgassing Low

 

Chemical Resistance 

1=No Effect   2=Little Effect   3=Affected   4=More Affected   5=Severely Affected
Aromatic Solvents 1
Alipahtic Solvents 1
Chlorinated Solvents 1
Weak Bases 1
Strong Bases 1
Salt Water (O-S-1926) 1
Hydraulic Fluid (MIL-H-5606) 1
Lubricating Oil (MIL-L-7808) 1
De-Icing Fluid (MIL-A-8243) 1
Strong Acids 2
Strong Oxidants 2
Esters/Ketones 1
UV Light 2
Petroleum 1
Fungus (ASTM G-21) 1
Salts 1

 

Operating Temperatures
Minimum Continuous -94°F/-70°C
Maximum Continuous (MIL-I-23053) 1,202°F/650°C
Melt (ASTM D-2117) 2,048°F/1,120°C

 

Other Information
Halogen Free Yes
RoHS Yes
UL/CSA Yes
SVHC None

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.

To be eligible for a return, your item must be in the same condition that you received it, and in its original packaging. You’ll also need the receipt or proof of purchase.

To start a return, you can fill out the ORDER RETURN FORM HERE. If your return is accepted, we’ll send you the instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Exceptions / non-returnable items
Certain types of items cannot be returned, like custom products (such as special orders or personalized items). Please get in touch if you have questions or concerns about your specific item. Certain Items will Carry restocking fees for us to take back into our stock, This is due to items being made to order or for being an oversized item.

Exchanges

The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.

Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.

Have a question that is not answered here? Please go to our Contact Us page and submit your question to us.


Request a Quote

Looking for a quotation ? We would be happy to help by providing a quick response, inventory status, and Volume Level pricing, when available. Please fill out the form below and a representative will be in touch with you within hours to one business day to answer any questions and quote your request.

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Product Details

Insultherm braided fiberglass sleeving has been the first choice among automotive professionals and enthusiasts alike for many of their thermal protection applications. These innovative sleeves offer the same high temperature protection in an easy slip on sleeve that will extend the life of expensive spark plug wires by protecting them where they need it most... at the boot. Just slip these 3/4” diameter double thickness (triple thick at the sewn end) sleeves over any spark plug cable and boot (even right angle boots) to protect them from engine temperatures up to 1,200°F. Once installed, the sleeves require no clearance from hot surfaces, and can even rest directly on hot exhaust headers without affecting performance. Insultherm Spark Plug Boot Sleeves are completely non-conductive, resist all engine chemicals, will not support combustion, and provide an easy, economical solution to the challenge of wire protection in the cramped, high temperature environment of any high performance engine compartment.

Product Specifications

Are we missing the specification you need? Please go to our Contact Us page and submit your question to us, or call 1-877-284-7760

Nominal
Size
Product
Part #
Diameter Wall Thickness Bulk Box Colors
No Ring-Easy Install
4 1/2"
7 1/2"
12"
FBN0.75
FCN0.75
FDN0.75
3/4"
3/4"
3/4"
.085"
.085"
.085"
144
144
144
**
With Ring
7 1/2" FCU0.75 3/4" .085" 144 4

**NT in-stock color; all other available by special order only NT, BL, BK, RD 

Physical Properties
Monofilament Thickness (ASTM D-204) NA
Flammability Rating VW-1
Recommended Cutting Scissor
Colors 4
Wall Thickness .085
Tensile Strength - Yarn (ASTM D-2265) lbs. NA
Abrasion Resistance High/td>
Specific Gravity 1.0 - 1.8
Moisture Absorption % (ASTM D-570) .01

 

Hard Vacuum Data (ASTM E-595 at 10-5 torr)
TML .02
CVCM .01
WVR .00
Smoke D-Max (ASTM E-662) NA
Outgassing Low

 

Chemical Resistance 

1=No Effect   2=Little Effect   3=Affected   4=More Affected   5=Severely Affected
Aromatic Solvents 1
Alipahtic Solvents 1
Chlorinated Solvents 1
Weak Bases 1
Strong Bases 1
Salt Water (O-S-1926) 1
Hydraulic Fluid (MIL-H-5606) 1
Lubricating Oil (MIL-L-7808) 1
De-Icing Fluid (MIL-A-8243) 1
Strong Acids 2
Strong Oxidants 2
Esters/Ketones 1
UV Light 2
Petroleum 1
Fungus (ASTM G-21) 1
Salts 1

 

Operating Temperatures
Minimum Continuous -94°F/-70°C
Maximum Continuous (MIL-I-23053) 1,202°F/650°C
Melt (ASTM D-2117) 2,048°F/1,120°C

 

Other Information
Halogen Free Yes
RoHS Yes
UL/CSA Yes
SVHC None

Product Manuals

Frequently Asked Questions

Have a question that is not answered here? Please go to our Contact Us page and submit your question to us.


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We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.

To be eligible for a return, your item must be in the same condition that you received it, and in its original packaging. You’ll also need the receipt or proof of purchase.

To start a return, you can fill out the ORDER RETURN FORM HERE. If your return is accepted, we’ll send you the instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Exceptions / non-returnable items
Certain types of items cannot be returned, like custom products (such as special orders or personalized items). Please get in touch if you have questions or concerns about your specific item. Certain Items will Carry restocking fees for us to take back into our stock, This is due to items being made to order or for being an oversized item.

Exchanges

The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.

Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.

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