The last ten years have seen a dramatic improvement in the aerodynamics
and styling of bus and coach vehicles. The front and rear modules of modern vehicles are two of the most visible indicators of such changes. The use of thermoset composites is now common for such applications, and has enabled dramatic changes in vehicle styling and aerodynamic behaviour to be achieved. In addition to these changes, such applications must comply with ever-tougher durability, impact and ease-of-assembly requirements. Sika has formulated a range of materials to exceed customer requirements for this challenging application. Sikaflex provides high-performance elastic assembly within an easy-to-use one-component formulation. Sikaflex hybrid technology provides the high performance of Sikaflex polyurethane systems combined with reduced substrate preparation and improved ecological benefits. Sikaflex-254 Booster provides the high-performance attributes of Sikaflex, combined with rapid full cure due to the combination with Sika’s proprietary Booster system. SikaFast two-component methyl methacrylate structural adhesives provide high strength and excellent impact resistance with low surface preparation.
| |  Transportation Industry
Bus & Coach
Body Structure
Floor, Side Panels & Luggage...
Roof Bonding
Front & Rear Module
Direct Glazing
Interior Trim
Acoustic Management
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Bonding of glass fi bre reinforced plastic (GRP) masks provides
tremendous benefi ts compared to other fi xation methods | | |
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| Technological Benefits | | |
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Improved moisture and water sealing |
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Enhanced sound and vibration damping |
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Rapid assembly |
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High-performance adhesion |
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Excellent impact resistance |
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Ability to withstand different CLTE (Coefficient of Linear Thermal Expansion) between thermoset composites and metals |
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| Why Bond Front & Rear Mask Applications? | | |
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Bonded assemblies enable weight reduction versus mechanically fastened systems enabling better fuel economy and emissions |
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Use of adhesives and sealants does not damage the vehicle corrosion protection layer, therefore reducing the likelihood of repair |
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Adhesive systems absorb vibration, improving interior and exterior vehicle noise levels |
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Bonded and sealed systems provide enhanced water leakage resistance to minimise vehicle repair frequency and time |
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| Future Trends for Front & Rear Mask Applications | | |
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Greater use of advanced composites |
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Possible use of thermoplastic composites such as GMT (Glass mat reinforced Thermoplastic Composite) and LFI (Long Fibre Injection) |
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Best Recommended Sika Products
Features & Benefits | | |
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SikaFast-3000 Series |
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High tensile properties, elasticity and impact resistance; excellent adhesion profile; gap-filling capability |
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Sikaflex-254 |
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Extremely easy to use; long open time with fast curing time; multi-purpose system; widely OEM approved |
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Sikaflex-552 |
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UV-stable assembly adhesive for sealing and bonding, excellent adhesion properties, ecology friendly; suitablealso for exterior joints
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PDS MSDS |
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Sikaflex-254 Booster |
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Fast curing; ‘fail-safe’ systems cures even in the absence of Sika Booster Paste; good mechanicalproperties and adhesion
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PDS MSDS |
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