Window & Door Foam Explained: PENOSIL Gunfoam 55 156 vs. Gunfoam 173
03.09.2026
Window and door installation demands precision, consistent application, and reliable materials. Although the installation process itself remains largely the same throughout the year, working conditions can vary considerably with the weather. Temperature, in particular, can affect how polyurethane foam expands, cures, and performs during application.
To help professional installers achieve reliable results in different conditions, PENOSIL offers two specialised window and door installation foams: Window & Door Gunfoam 55 156 and Window & Door Gunfoam 173. Both are designed to deliver professional installation performance, but each is optimised for a different temperature range.
Why Application Temperature Matters
Polyurethane foam is sensitive to the conditions in which it is applied. Ambient temperature can influence foam expansion, curing time, cell structure, adhesion, and overall ease of application. Using a foam suited to the temperature on site helps installers maintain control during application and achieve consistent sealing and insulation results.
For this reason, choosing a foam according to the season and working conditions can be more effective than using the same product throughout the year.
PENOSIL Window & Door Gunfoam 55 156
PENOSIL Window & Door Gunfoam 55 156 is designed for standard and warm installation conditions. With an application temperature range of +5°C to +40°C, it is particularly well suited to spring, summer, and early autumn projects.
Key Features
- Yield up to 55 litres
- Low curing pressure to minimise stress on window and door frames
- Excellent thermal insulation 0,033 W/(m·K)
- Excellent acoustic insulation 62 dB
- Application temperatures from +5°C to +40°C
- Optimised for warmer working environments
Its extended upper application limit of +40°C makes it particularly valuable during summer installations, where conventional foams may become more difficult to control. The formulation allows installers to continue working efficiently even during hot weather without compromising installation quality.
PENOSIL Window & Door Gunfoam 173
PENOSIL Window & Door Gunfoam 173 is formulated as an all-season installation foam for professionals working throughout the year.
Key Features
- Yield up to 53 litres
- Low curing pressure
- Excellent thermal insulation 0,033 W/(m·K)
- Excellent acoustic insulation 62 dB
- Application temperatures from -5°C to +30°C
- Suitable for year-round installation
Its ability to be applied in temperatures as low as -5°C allows installation work to continue when colder weather arrives. This helps contractors extend the construction season without changing installation methods or sacrificing performance.
Comparing the Two Products
| Property | Window & Door Gunfoam 55 156 | Window & Door Gunfoam 173 |
|---|---|---|
| Foam yield | Up to 55 L | Up to 53 L |
| Curing pressure | Low | Low |
| Thermal insulation | 0,033 W/(m·K) | 0,033 W/(m·K) |
| Acoustic insulation | 62 dB | 62 dB |
| Application temperature | +5°C to +40°C | -5°C to +30°C |
| Best suited for | Standard and warm conditions | Year-round including colder conditions |
The Difference Is Temperature, Not Performance
When comparing the two products, it becomes clear that the primary distinction is application temperature range, not installation quality.
Both foams provide:
- Professional-grade sealing performance
- Low curing pressure that helps reduce the risk of frame deformation
- Excellent thermal insulation for improved energy efficiency
- Excellent sound insulation
- High foam yield suitable for professional installation work
The small difference in foam yield (55 L versus 53 L) is negligible in practical applications. Instead, installers should select the product according to the environmental conditions on site.
Which Foam Should Professionals Choose?
The answer depends on the working conditions.
Choose Window & Door Gunfoam 55 156 when:
- Installing during warmer months
- Ambient temperatures exceed +30°C
- Summer installation conditions require a foam optimised for higher temperatures
Choose Window & Door Gunfoam 173 when:
- Working during autumn or winter
- Temperatures approach freezing
- Installation needs to continue down to -5°C
Why Distributors Should Stock Both
Professional installers encounter a wide range of weather conditions throughout the year. By offering both Window & Door Gunfoam 55 156 and Window & Door Gunfoam 173, distributors can provide customers with a solution for virtually every installation season.
Instead of asking installers to compromise with one general-purpose product, the PENOSIL range enables them to select the foam best suited to the day’s conditions. This improves application comfort, helps maintain productivity, and supports consistent installation quality throughout the year.
Conclusion
Both PENOSIL Window & Door Gunfoam 55 156 and Window & Door Gunfoam 173 are premium installation foams engineered for professional window and door installation. They deliver nearly identical yield, excellent insulation properties, and low curing pressure, ensuring reliable installation performance.
The key difference lies in their recommended application temperature ranges. Window & Door Gunfoam 55 156 is optimised for standard and warm conditions up to +40°C, while Window & Door Gunfoam 173 extends installation capability into colder weather down to -5°C.
By choosing the right foam for the season – or stocking both products – professionals can ensure efficient application, reliable performance, and high-quality installations regardless of the weather.