| Customization: | Available |
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| Bonding Function: | Instant Adhesive |
| Morphology: | Solvent |
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Sikasil® WS-303 is a neutral-curing silicone sealant with a high movement capability and excellent adhesion to a wide range of substrates.
Features & Benefits
- Meets requirements of GB/T14683-2017,
- Outstanding UV and weathering resistance
- Adheres well to many substrates including glass, metals, coated and painted metals, plastics and wood
| Chemical base | 1-C silicone |
| Cure mechanism | Moisture-curing |
| Cure type | Neutral |
| Density (uncured) (CQP 006-4) | 1.4 kg/l |
| Non-sag properties (CQP 061-4 / ISO 7390) | ≤ 2mm |
| Application temperature | 5 - 40 °C |
| Skin time3(CQP 019-2) | 30 min. |
| Elastic recovery(GB/T 14683/ISO 7389) | 80% |
| Elongation at break (CQP 036-1 / ISO 37) | 600 % |
| Tear propagation resistance (CQP 045-1 ) | 4 N/mm |
| 100% modulus (CQP 555-1 / GB/T 14683) | 0.3 N/mm2 |
| Thermal resistance (CQP 513-1) 4 hours
short term 1 hour |
200 °C
220 °C |
| Service temperature | -40°C - 150 °C |
| Shelf life (storage below 25 °C) (CQP 016-1) | 15 months |
Areas of Application
Sikasil® WS-303 can be used for weatherproofing and sealing applications where durability under severe conditions is required.
Sikasil® WS-303 is particularly suited as a weather seal for curtain walling and windows.
This product is suitable for professional experienced users only.
Tests with actual substrates and conditions have to be performed to ensure adhesion and material compatibility.
Cure Mechanism
Sikasil® WS-303 cures by reaction with atmospheric moisture. The reaction thus starts at the surface and proceeds to the core of the joint. The curing speed depends on the relative humidity and the temperature (see diagram 1). Heating above 50 °C to speed-up the vulcanization is not advisable as it may lead to bubble formation. At low temperatures the water content of the air is lower and the curing reaction proceeds more slowly.
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