Cold-curing epoxies: Below freezing temperatures
Last update on May 15, 2026
This article was originally published in 2011 and revised in 2026.
Epoxy adhesives are renowned for their versatility, and one of their key advantages is the ability to cure at room temperature or even below freezing. This guide explores cold-curing epoxy systems specially formulated for sub-zero environments, where conventional adhesives often fail.
Fast-curing two-component epoxies using advanced hardeners like accelerated polymercaptans can develop handling strength in minutes at room temperature and deliver reliable bonds down to -20°C or lower. Ideal for cold-weather construction, emergency repairs, outdoor assembly, and winter maintenance.
In this guide, you’ll discover the chemistry, performance data, advantages, limitations, best practices, and real-world applications for successful bonding in extreme cold.
Room-temperature and low-temperature curing epoxies
One of the distinct advantages of epoxy adhesives is that they can be cured at room temperature or even at lower temperatures. Epoxy adhesives are often divided into:
Room temperature curing types
Elevated temperature curing types
Once mixed, the two-part room temperature curing epoxy adhesives are designed to react at ambient conditions and temperatures near room temperature (20°C - 25°C) or lower. However, in many cases the cure time may be accelerated with heat, but this is not a requirement. Once mixed, the crosslinking reaction begins immediately, and the resulting working life is limited. The cure rate and working life will be dependent on the specific formulation as well as the ambient temperature. Although the adhesive will harden to a handling strength in usually a short period of time, it will continue to develop strength for a much longer period.
Depending on the type of curing agent chosen, epoxy adhesive systems can reach full strength in minutes to several days. The most common types of epoxy adhesives will reach handling strength in several hours and full cure in five to seven days. The faster curing agents can reach handling strength in as little as five minutes at room temperature. These fast cure formulations also provide practical cure times at low temperatures and they are well suited for outdoor application in winter.
Table 1 shows typical physical property and performance data for several two-component epoxy adhesives. As can be seen from the property data, the adhesives can be formulated to meet a broad range of application and performance property requirements.
Property | General Purpose | Fast Setting | High Performance |
Viscosity, Pa-sec
|
50 |
260 |
91 |
| Mix Ratio, weight | 100 resin / | 100 resin / | 100 resin / |
Specific gravity
|
1.17 |
1.48 |
1.36 |
| Gel time | 2 hrs | 4 min | 1 hr |
| Cure schedule | 24 hrs at 25°C or | 4 hrs at 25°C | 5 days at 25°C or |
| Elongation at break, % | --- | --- | 11 |
Aluminum tensile shear strength, psi, at
|
2900 |
1500 |
4200 |
Tensile shear after:
|
2200 |
3000 |
3800 |
| T-peel strength, lb/in | --- | --- | 11 |
Table 1: Properties of two-component epoxy adhesives.1
These fast-setting epoxy adhesives are highly effective when time is critical. However, their high reactivity can also create certain handling and performance concerns, which we’ll explore next.
Characteristics of fast curing epoxy adhesives
Highly reactive two component epoxy adhesives have several advantages. These adhesives can come to a practical handling strength in minutes at room temperatures and can develop useful bond strengths at ambient temperatures as low as -20°C. The various uses for these adhesives include:
- Bonding difficult to clamp fixtures such as surface mounting electrical receptacles, brackets, and racks to masonry walls;
- Rapid production line assembling, such as bonding together sections of reinforced plastic car bodies;
- Bonding traffic buttons to highways when minimum traffic delay is important;
- Emergency repair of leaks; and
- Cold weather construction uses such as pressure grouting, pipe joint sealing, bridge support structure repair, etc.
These fast curing systems also have difficulties, however, that are directly related to their reactivity. Generally, the disadvantages must be balanced against the relative merits of using these adhesives. The major disadvantages of using fast curing epoxy adhesives include the following:
- Shrinkage on polymerization is greater than with slower curing adhesives, and the increased shrinkage can result in increased stresses within the joint
- Highly reactive epoxy adhesives are generally more brittle than slower reacting systems, and this results in lower peel and impact strengths
- Highly reactive adhesives are more difficult to mix and apply because of their short working life resulting in inaccuracies and material waste; automated metering, mixing, and dispensing equipment may be required
- There may be insufficient time to properly align the substrates, and misaligned parts can result in waste
- Many of the more reactive curing agents and accelerators cause skin irritation and toxicological problems.
Thus, fast cure is often looked upon as a liability rather than as a benefit. Because the fast acting catalysts react so quickly with epoxy resins and because they are used in very small proportions, homogeneous mixing is difficult, and variation in crosslinking density can occur throughout the adhesive. Another consequence of high reactivity is a high exotherm. A high exothermic temperature can be degrading to the final epoxy adhesive properties and even dangerous if large masses of mixed adhesives overheat.
Now that we’ve looked at the advantages and limitations of fast-curing epoxy adhesives, let’s understand the curing agents that make these rapid reactions possible.
Curing agents for conventional epoxy resins
Epoxy acrylate adhesives
Processes for applying adhesives at cold temperatures
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- (n.d.). Starting Formulations 4000 and 4001. Hexion.
- Kincaid, D. S. (2001). Epoxy polyacrylate hybrids - A continuing study. Tech Paper SC2225-01, Resolution Performance Products.