Summer is a stress test – not only for people and technology, but also for seals. Whether in windows, vehicles or machines: high temperatures, UV radiation and material expansion put every seal to the test. In this article, we show how seals are correctly selected, maintained and applied to ensure optimal performance under summer conditions – in construction, mobility or industry.

1. Typical summer stress factors for seals

• UV radiation: causes embrittlement in some materials

• Thermal expansion: joints and structures shift – the seal must adapt

• Temperature fluctuations: e.g. 35°C by day, 15°C at night – that’s demanding

• Moisture and heat: can lead to ageing, deformation or mold

2. Common summer applications

• Windows, doors, facades (new builds and renovations)

• Vehicles, caravans, boats

• Outdoor installations, PV systems, HVAC

• Industrial gates, warehouse logistics, climate systems

3. Material overview – which seal for which need?

• TPE (thermoplastic elastomers):

  • Easy to process, recyclable, cost-effective

  • UV-stabilised types suitable for many outdoor applications

  • Temperature resistant up to approx. 100 °C

• Silicone:

  • Excellent resistance to heat and UV (up to 200 °C)

  • Durable, elastic, weatherproof

  • Ideal for facades, vehicles, technical equipment

4. Practical tips for hot days

• Storage: keep cool, dry and out of sunlight

• Installation: account for material expansion

• Care: use rubber conditioners regularly

• Inspection: check regularly for cracks or loss of function, especially on seasonal equipment

5. Summer is planning season Most construction and retrofit projects take place in summer. Now is the perfect time to plan sealing solutions, select materials and install long-lasting systems. Choosing the right seal from the start prevents problems later.

Conclusion: Whether in windows, vehicles or industrial settings: seals must work even in summer. With the right material, proper installation and regular maintenance, you ensure reliable performance and long-term durability – even in tough conditions.

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