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Application Overview
Door and window systems are widely used in residential, commercial, and industrial buildings, where sealing performance directly affects waterproofing, air tightness, and long-term durability.
During installation, various joints are formed between window frames and walls, as well as between glass and profiles. These joints are continuously exposed to temperature fluctuations, wind pressure, rainwater, and UV radiation, placing high demands on adhesion, elasticity, and weather resistance of sealing materials.
Proper selection of sealants and PU foam is essential to ensure long-term performance and leakage prevention in door and window systems.
Common Challenges / Pain Points
Irregular gaps between window frames and walls lead to water leakage and air infiltration
Different thermal expansion rates of metal, glass, and concrete cause joint cracking
Ordinary sealants lack sufficient elasticity to accommodate long-term movement
Deep gaps are difficult to fill with sealant alone, resulting in sagging or cracking
Strong UV exposure outdoors accelerates aging of sealing materials
Our Solution for This Application
Seimeda offers a combined solution of sealants and PU foam tailored for various door and window installation scenarios.
PU foam is used to fill gaps between window frames and walls, providing structural support as well as thermal and acoustic insulation, while silicone sealants are applied on the surface to form a weather-resistant, waterproof, and movement-capable seal.
This integrated system significantly enhances overall sealing performance and service life of door and window installations.
Technical Requirements for This Application
Sealant movement capability ≥ 25%
Excellent weather and UV resistance
Strong adhesion to glass, aluminum, and concrete substrates
PU foam with low shrinkage and stable filling performance
Installation Tips / Application Guide
Ensure substrates are clean, dry, and free of oil or dust before application
Fill deep gaps with PU foam first, trim after initial curing
Apply silicone sealant continuously on the surface to ensure full coverage
Avoid application during rain or extreme low temperatures
Frequently Asked Questions (FAQ)
Can PU Foam and sealant be used separately during window and door installation?
PU Foam is primarily used for filling and support, while sealant is used for waterproofing and movement compensation. The best results are achieved when both are used together.
After PU Foam cures, is it necessary to apply sealant?
Yes. PU Foam does not have long-term weather resistance, so sealant must be used for surface protection.
Can window and door sealant be used outdoors?
It is recommended to use weatherproof or neutral silicone sealant, which is suitable for long-term outdoor exposure.
