SIKASIL®-WS-305 S WEATHER SEALANT BLACK – 600 ML SAUSAGE | NASIR & SONS | SIKA PAKISTAN

LOW-MODULUS WEATHER SEALANT FOR CURTAIN WALL AND METAL CLADDING FACADES   P R O D U C T B E N E F I T S: ▪ Meets requirements of GB/T 14683 and ASTM C 920 for Type S, Grade NS, Class 35 (movement capability ± 35 %) ▪ Very good UV and weathering resistance Adheres well to many substrates including glass, metals, coated and painted metals, plastics and wood   METHOD OF APPLICATION : S u r f a c e p r e p a r a t i o n Surfaces must be clean, dry and free from grease, oil and dust. Surface treatment depends on the specific nature of the substrates and is crucial for a long lasting bond. Application: The optimum temperature for substrate and sealant is between 15 °C and 25 °C. Sikasil® WS-305 S can be processed with manual, pneumatic or electric driven piston guns. Joints must be properly dimensioned. For optimum performance the joint width needs to be designed according to the movement capability of the sealant based on the actual expected movement. The minimum joint depth is 6 mm and a width / depth ratio of minimum 2 : 1 and maximum 4 : 1 must be respected. Joints deeper than 15 mm must be avoided. For backfilling, it is recommended to use closed cell, sealant compatible foam backer rods e.g. high resilience polyethylene foam rod. If joints are too shallow for backing material to be employed, we recommend using a polyethylene tape. This acts as a release film (bond breaker), allowing the joint to move and the silicone to stretch freely.     AREAS OF APPLICATION: Sikasil® WS-305 S can be used for weatherproofing sealing applications where durability under severe conditions is required. It is particularly suited as a weather seal for structural glazing, curtain walling and windows. This product is suitable for experienced professional users only. Tests with actual substrates and conditions have to be performed to ensure adhesion and material compatibility.   Tooling and finishing : Tooling and finishing must be carried out within the skin time of the sealant. When tooling freshly applied Sikasil® WS-305 S press the sealant to the joint flanks to get a good wetting of the bonding surface. No tooling agents to be used.   Application limits: Most Sikasil® WS, SG, IG and WT, silicones manufactured by Sika are compatible with each other. For specific information regarding compatibility between various Sikasil® products contact the Technical Department of Sika Industry. To exclude materials influencing Sikasil® WS- 305 S, all materials such as gaskets, tapes, setting blocks, sealants, etc., in direct and indirect contact have to be approved by Sika in advance. Where two or more different reactive sealants are used, allow the first to cure completely before applying the next. Sikasil® WS- 305 S may only be used in combination with structural glazing applications after a detailed examination of the corresponding project details. Do not use Sikasil® WS-305 S on PMMA and PC elements as it may cause environmental stress cracking (crazing).   D I S C L A I M E R The information, and, in particular, the recommendations relating to the application and enduse of Sika products, are given in good faith based on Sika’s current knowledge and experience of the products when properly stored, handled and applied under normal conditions in accordance with Sika’s recommendations. In practice, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchantability or of fitness for a particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any written recommendations, or from any other advice offered. The user of the product must test the product’s suitability for the intended application and purpose. Sika reserves the right to change the properties of its products. The proprietary rights of third parties must be observed. All orders are accepted subject to our current terms of sale and delivery. Users must always refer to the most recent issue of the local Product Data Sheet for the product concerned, copies of which will be supplied on request.