Home generalHeat-resistant adhesive - these can withstand high temperatures

Heat-resistant adhesive - these can withstand high temperatures

  • High temperature adhesive
    • Tips for the selection
    • Products & Prices
    • use
    • application

A heat-resistant adhesive should still provide secure connections where other adhesives have long since given up and can no longer be used. It is a professional adhesive and bonding agent that is extremely resistant to temperature changes and aging only slowly. Heat-resistant adhesive can also protect against corrosion.

There are many applications where conventional adhesives fail. Unfortunately, high temperatures in particular can influence the processing of the adhesive and its properties in the dried or bonded state. Many commercial adhesives fail at high temperatures. Either they melt and thus can no longer produce a secure connection or they become porous and thus fulfill their purpose as well. Here, special and heat-resistant adhesive is used. Even high temperatures of several hundred degrees Celsius do not bother him. It can also be used in the oven, for example, when an oven panel needs to be glued.

Bonded joints and the influence of temperature on their properties

One of the most important factors in the use of adhesives is the temperature. It influences the curing time and the viscosity of the adhesives. In addition, other factors depend on the temperature, such as the subsequent hardness of the adhesive compound or its strength and resistance to aging processes. The temperature also plays an essential role in the actual processing of the surface to be processed. Heat-resistant adhesive has been manufactured for room temperature processing, but also offers stable adhesive properties at high temperatures.

High temperature adhesive

Choose the right glue for the selected temperature range

It is very important to choose the right adhesive for every application and for the corresponding temperature range of the later connection point.

The following things play a role here:

  • the curing time as well as the viscosity of the adhesive
  • the hardness of the later connection
  • possibly occurring temperature fluctuations at the later connection point
  • possibly mechanical effects on the splice, which may occur during later use
  • the materials used at the splice
  • possibly further environmental conditions such as moisture or even wetness
  • optical impairments, which can be caused by the splice and could be disturbing later

So there are a lot of things that matter for the right choice of glue used. Here are some tips to help you choose the topic:

Tips for the selection

... the right glue

  • The technical data sheet or the safety data sheet, which contains heat-resistant adhesives, usually provides reliable information about technical properties and the factors just mentioned.
  • Some adhesives should only be processed within a certain temperature range.
  • Often, high temperatures significantly reduce the adhesive power.
  • Only heat-resistant adhesive offers ideal properties even in high temperature ranges.
  • High-temperature adhesive or heat-resistant adhesive is usually characterized as such (for example, by clearly visible temperature information on the packaging). (Possible picture: temperature data on packaging for heat-resistant adhesive)
  • The materials of the surfaces to be bonded also play a role and should match the details of the preferred adhesive.

Products & Prices

Some high temperature adhesives of well-known manufacturers as well as their prices

Many well-known manufacturers offer high temperature glue. Here are some examples with prices:

ProductsusetemperaturesPrices
UHU 46735 high temperature silicone
  • Sealing and bonding of gaps, joints and cracks
  • permanently up to 180 ° C
  • short term up to 300 ° C
9, 00 € for 80 ml
Thermic 1100 ° C
  • Fireplace adhesive for sealing stoves and fireplaces
  • heat resistant up to 1100 ° C
8, 90 € for 20 g
Fermit Thermocoll
  • Glue for seals
  • heat resistant up to 1100 ° C
4, 99 € for 17 ml
UHU Plus Endfest 2-component adhesive
  • Metals, stone, concrete, wood, porcelain
  • heat resistant up to 100 ° C
€ 7.35 for 24 ml
Henkel Loctite 5366 silicone adhesive
  • Permanently elastic sealant for glass, metal, plastics and ceramics
  • heat resistant up to 150 ° C
14, 95 € for 310 ml
E-Coll 2-pack epoxy adhesive
  • high-strength bonding and filling compound for stoneware, ceramics, wood, glass, concrete, metal
  • heat resistant up to 100 ° C
5, 54 € for 50 g
JB Weld HighHeat epoxy metal putty
  • Exhaust pipes, silencers, engine blocks
  • permanently up to 235 ° C
  • short term up to 260 ° C
14, 95 € for 50 g

Basically, larger containers are usually cheaper to obtain than, for example, small tubes. If larger quantities of glue are needed on a regular basis, it is best to buy larger containers.

use

Possible applications for high-temperature adhesives

Most heat-resistant adhesives are suitable for both short-term and long-term use at high ambient temperatures. Nevertheless, there are some differences. For example, certain adhesives are suitable for use even with strong temperature fluctuations. Such special adhesives are often used in the following areas:

  • Combustion and electric motors (for example as sealants)
  • Connections in industrial plants
  • Ovens and cookers
  • Fireplaces and stoves
  • Connections in heating and exhaust systems
  • fittings

Adhesives are often used as sealants

Very many adhesives serve another purpose, namely the sealing of individual components in the machines or other devices such as closures. When choosing the right adhesive, it is therefore very important to use a heat-resistant adhesive that can fulfill this important function. Not all high temperature adhesives are suitable for simultaneous use as sealants. (Possible picture: machine parts with sealing surfaces)

Heat-resistant adhesive as a special agent for high temperatures

Heat-resistant adhesives must have certain properties even at extreme temperatures, even with a variety of different materials or combinations of materials, including the following:

  • Metals of all kinds
  • ceramics
  • mineral substances
  • plastics
  • rubber
  • stone materials
  • Glass and many more

Special high-temperature adhesives include very fast-curing adhesives such as superglue or special component adhesives and contact adhesives. Of course, all these adhesives have their prices and are partially optimized for use even at higher temperatures. They thus provide significantly more than usual adhesives. Some of these adhesives can even be used for temperatures of up to several hundred degrees Celsius, sometimes even for extreme applications in temperature ranges around 1000 degrees Celsius.

For strength or tensile strength

An important factor in the use of a heat-resistant adhesive is the subsequent strength of the bond, which is usually given for a surface area of ​​one square centimeter. In the best case, this tensile strength reaches values ​​of several hundred kilograms per square centimeter. An adhesive of such a thickness can be used even if an adhesive bond is to be used instead of, for example, welding, brazing or screwing. (Possible picture: screw or splice)

For further processing of the splice

Many compounds made with special glue can later be painted over or painted. Often it is also possible to further mechanically process the joint, such as sanding or sanding. If this is desired, appropriate information should be available for the adhesives used. Often, these properties are given only at a certain mixing ratio (in multi-component adhesives). These special properties sometimes also affect the prices of the adhesives to be purchased.

application

1. Before using the adhesive, the processing instructions on the packaging should be thoroughly studied. A very important indication is, for example, the processing time, ie the time in which the adhesive should be processed before it hardens. The times may vary greatly and are also dependent on the respective ambient temperatures.

2. Here we are already at the next important factor: the temperature. Not only the later use temperature for the joint is important, but also the processing temperature. Frequently, adhesives can only be processed reasonably within certain temperature ranges and guarantee a later quality of the connection produced only in these areas.

3. Of course, it should be ensured that the adhesive surfaces to be treated are thoroughly cleaned before applying the adhesive. A good preparation of the adhesive surfaces is already half the battle.

4. The splices should be bonded together according to the instructions of the manufacturer of the adhesive used. Frequently, the contact pressure plays an essential role. Many adhesive bonds achieve only the desired strength, if sufficient contact pressure was present during processing.

5. Once the adhesive bond has been made, the bond should be given sufficient time before being stressed mechanically or by high temperatures. (Possible picture: still fresh splice)

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