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Aluminum alloy doors and windows--Sealing tape ②
2025-05-30
In aluminum window and door systems, the structural design of the sealant directly affects its sealing effect and service life. Different application scenarios - such as high wind pressure areas, extreme temperature difference environments or high humidity spaces - place different requirements on the elasticity, aging resistance and compression resilience of sealants. So, how to choose the most suitable window and door solution according to the structural characteristics of the sealant? In this article, we will analyze the structure of common sealant types (solid, hollow, composite foam, etc.), and provide professional selection advice for different use scenarios, to help you achieve a more durable and efficient sealing protection!
Ⅰ. Classification by structure
1. Solid sealing tape
Characteristics: dense structure, strong sealing, but heavy weight, high cost.
Application: high airtightness requirements of Doors And Windows, curtain walls.
2. hollow sealing tape (foam structure)
Characteristics: light weight, good elasticity, excellent sound and heat insulation, but weak compression resistance.
Application: soundproof doors and windows, automobile doors and windows.
3. Composite sealing tape (multi-material/multi-cavity)
Characteristics: Combining different materials or structural advantages (e.g. EPDM + sponge rubber), strong comprehensive performance.
Applications: high-end construction, automotive industry.
Ⅱ. according to the application scene classification
1. Door and window sealing tape
Emphasize waterproof, sound insulation, wind pressure resistance, commonly used EPDM or TPE material.
2. Curtain wall sealing tape
Need ultraviolet resistance, aging resistance, mostly use EPDM or silicone rubber.
3. automotive sealing tape
High and low temperature resistance, oil resistance, commonly used EPDM or TPV material.
Ⅲ. the core performance characteristics
1. Physical properties
Elastic recovery rate (≥ 70% is qualified), compression permanent deformation rate (low is excellent).
Tensile strength, elongation at break (reflecting tear resistance).
2. Chemical properties
Acid and alkali resistance, oil resistance, solvent resistance, ozone resistance.
3. Environmental adaptability
Resistant to high and low temperature, UV aging, mildew resistance.
4. Environmental friendliness
Low VOC (volatile organic compounds), no heavy metals. 
Ⅳ.Suggestions for selection
High temperature environment: Priority silicone rubber or EPDM.
Cost-effective scene: choose EPDM or PVC.
Sound and heat insulation needs: choose hollow or composite structure of the rubber strip.
Environmental requirements: choose TPE, silicone rubber or halogen-free EPDM.
The structural design of sealant is by no means “one size fits all”, solid adhesive strip is suitable for pressure-bearing parts, hollow structure is good at buffering and shock absorption, while composite foam is outstanding in thermal insulation and soundproofing scenarios. Whether it's a coastal high salt spray region, the northern cold environment, or the harsh requirements of sound insulation bedroom doors and windows, precise matching of the sealant structure in order to maximize its performance advantages.
