Ứng dụng
Construction & Automotive MS Sealants
For construction facade and automotive MS sealants, focusing on long-term non-yellowing performance, compatibility and bond durability.
Ứng dụng
Construction & Automotive MS Sealants
The appearance stability of a sealant depends on how well the plasticizer resists oxidation under ultraviolet and heat, and on its compatibility with the polymer, fillers and adhesion promoters. DB77 is designed for MS sealant systems with good resin compatibility and a long-term non-yellowing direction, which suits construction and automotive sealing where weathering and appearance matter.
Key performance requirements
| Item | Direction and notes |
|---|---|
| Non-yellowing | Small colour shift after accelerated and outdoor exposure |
| Compatibility | Compatible with the polymer, calcium carbonate fillers and promoters |
| Bond durability | Retains elongation and bond strength after ageing |
| Appearance | Automotive interior directions target low fogging and odour |
Dosage and processing direction
The addition level follows the compatibility of the sealant system and filler; evaluate with the measured colour difference after accelerated weathering.
Control mixing temperature and vacuum deaeration time so that the production heat history does not affect appearance stability.
Frequently asked questions
Can non-yellowing performance be guaranteed?
No. DB77 is designed with a long-term non-yellowing direction; the result depends on the full formulation and exposure conditions and is assessed by weathering tests with colour measurement.
Do construction and automotive sealants need different grades?
The same grade can serve both, but the evaluation focus differs: construction emphasises weathering and appearance, while automotive also requires low fogging, low odour and non-staining behaviour.
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