Sikasil Ws-303 Neutral-Curing Silicone Weatherproofing Sealant for Curtain Walling and Windows

• Bonding Function: Instant Adhesive
• Morphology: Solvent
• Application: Automobile, Construction, Woodworking, Footwear & Leather, Fiber & Garment, Packing
• Material: Silicone
• Classification: Room Curing
• Main Agent Composition: Rubber
• Model NO.: Sikasil WS-303
• Characteristic: Weatherability
• Promoter Composition: Curing Agent
• Composition: Organic Material
• Color: White Gray Black
• Transport Package: Carton
• Trademark: Sika
• Production Capacity: 500000/Year

Product Description

Product Description

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

Technical Data

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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