What temperature can fiberglass pipe insulation withstand?

Author: Annetta Langworth  |  Last update: Friday, August 15, 2025

Product Applications Insulation of hot, cold, concealed and exposed piping operating at temperatures from 0°F (-18°C) to 1,000°F (538°C) (with heat-up schedule) in commercial buildings, industrial facilities, and process or power plants.

What temperature can fiberglass insulation withstand?

Due to its composite, inorganic nature, fiberglass can withstand some of the most extreme temps while still maintaining its form. Fiberglass can retain 50% of its strength at 700° Fahrenheit (371° Celsius) and 25% of its strength at 1000° Fahrenheit (538° Celsius), making it ideal for industrial use.

Will fiberglass insulation keep pipes from freezing?

Insulate Your Pipes and Your Water Tanks

Use foam rubber or fiberglass sleeves to help decrease the chances of freezing.

Is fiberglass pipe insulation fireproof?

The flammability of pipe insulation depends on the type of material used. Some materials like rubber and rockwool are generally non-flammable, while others like fibreglass are fire-resistant but not entirely fireproof.

Is Fibreglass insulation fireproof?

Fiberglass and mineral wool insulation

Materials are noncombustible, and remain so for the life of the product. They require no additional fire-retardant chemical treatments—in fact, unfaced fiberglass and mineral wool are accepted as a fire block in wood frames.

Fibreglass Pipe Insulation - The Ultimate Guide

What is the temperature rating for fiberglass pipe insulation?

Insulation of hot, cold, concealed and exposed piping operating at temperatures from 0°F (-18°C) to 1,000°F (538°C) (with heat-up schedule) in commercial buildings, industrial facilities, and process or power plants. 1. Application temperatures are from 25°F (-4°C) to 110°F (43°C).

What is the best pipe insulation to prevent freezing in the winter?

Fiberglass Insulation

This plastic layer is designed to trap moisture and preserve warm temperatures. As such, this material is best suited for warm water pipes, especially in colder climates. By using fiberglass pipe insulation, you can keep your pipes warm throughout the year.

Can fiberglass pipe insulation be used outside?

While not intended for outdoor use, preformed fiberglass pipe insulation with conventional all service jacketing (ASJ) has an exposed kraft paper surface and self-sealing lap (SSL) joints. This type of jacket, which is not multi-ply, has been available for several decades.

What temp will insulated pipes freeze?

Insulated pipes may freeze in under six hours of 20 degrees weather, while it would likely take over 12 hours in 20 to 32 degrees weather.

Which is better, foam or fiberglass pipe insulation?

Here you go: The best low-temperature insulation: Cellular plastic or foam rubber. The best moderate-temperature insulation: Glass fiber. The best high-temperature insulation: Preformed cement, refractory materials or ceramic fiber blankets.

What R value is needed to keep pipes from freezing?

Homeowners typically want insulation with an R-Value of 49 or greater because when it comes to R-Value, the higher the better. The different types of insulation include: Fiberglass: Fiberglass insulation is highly recommended as the go-to insulation for colder temperatures.

What temp can poly pipe handle?

PE pipes may be used at operating temperatures between -40°C and +80°C.

How cold is too cold for fiberglass?

Check the temperature. If it is below 55 degrees, you may run into curing problems. To generate more heat, use a higher percentage of catalyst to resin. Up to 2% for Polyester(20cc per Quart), 3% for Vinylester(30cc per Quart).

What is the maximum temperature for pipe insulation?

Molded out of heavy-density resin-bonded inorganic glass fibers, Owens Corning® SSL II® with ASJ Max Fiberglas™ Pipe Insulation is designed to withstand temperatures from 0F to 1,100F, making it an outstanding option as thermal insulation for hot and cold service piping.

What temperature does Fibreglass melt at?

Generally, fiberglass has a melting point that ranges from around 1,000 to 1,400 degrees Celsius (1,832 to 2,552 degrees Fahrenheit). This high-temperature tolerance makes fiberglass insulation a practical choice for applications where heat resistance is crucial.

What is the best insulation for outside water pipes?

Foam pipe sleeves, commonly made from flexible, lightweight foam like polyethylene or rubber, are a user-friendly insulation option for outdoor water pipes. Designed to fit snugly, they provide an effective thermal barrier, helping to maintain water temperature and reduce the risk of freezing.

Can Armaflex pipe insulation be used outside?

Armaflex HT Pipe Insulation

Armaflex HT Insulation is designed for high-temperature, solar, and outdoor use.

Does fibreglass insulation need an air gap?

It's important to note that some insulation materials, such as spray foam, do not require an air gap. However, if you're using traditional insulation materials such as fibreglass or mineral wool, it's important to follow the manufacturer's guidelines for air gap size and placement.

How do you insulate pipes so they don't freeze?

How to Prevent Pipes Freezing
  1. Insulate Water Pipes in Exposed Areas. ...
  2. Install Foam Pipe Sleeves. ...
  3. Seal Crawl Space. ...
  4. Use Heating Tape. ...
  5. Insulate Pipe Gaps. ...
  6. Consistent Thermostat Settings. ...
  7. Insulate Your Crawl Space. ...
  8. Leave the Heat On When Traveling.

Is fiberglass pipe insulation safe?

Fiberglass and mineral wool pipe insulation meets corrosion test requirements specified in ASTM material specifications. Properly installed vapor retarder systems greatly reduce the likelihood of corrosion.

At what temperature should I drip my faucet?

To do so, he advises, 'Turn your taps on just enough to drip,' and leave them dripping until the temperature outside consistently stays above freezing. This is typically when the weather forecast indicates that the daytime and nighttime temperatures will stay above 32°F (0°C).

What temperatures can fiberglass handle?

High temperature, heat and flame resistant thermal insulating fiberglass fabric fabricated from high quality type E fiberglass that will not burn and will withstand continuous exposure to temperatures of 1000°F / 520°C. It is used to protect equipment, wires, cables, hoses, tubing and pipes.

How thick should pipe insulation be to prevent freezing?

The thickness of pipe insulation for most common residential cold water pipes is 1/2" thick. There is usually no additional benefit of adding more than 1/2" thick fiberglass or rubber pipe insulation to cold water piping.

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