This standard outlines the fundamental criteria for one-component, gun-grade polysulphide joint sealants primarily utilized in building and structural glazing. It details essential properties, packaging, storage, curing, adhesion, and durability requirements to guarantee dependable sealing performance. The specification is targeted at manufacturers, quality assurance personnel, and engineers selecting and applying these sealants in construction.
Overview
This standard outlines the fundamental criteria for one-component, gun-grade polysulphide joint sealants primarily utilized in building and structural glazing. It details essential properties, packaging, storage, curing, adhesion, and durability requirements to guarantee dependable sealing performance. The specification is targeted at manufacturers, quality assurance personnel, and engineers selecting and applying these sealants in construction.
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Frequently Asked
The polysulphide sealant must be a one-component, gun-grade material with a moisture-activated curing mechanism that forms a rubber-like solid upon curing. It should be suitable for sealing joints in buildings and structural glazing, exhibiting elasticity and durability to accommodate movement. The sealant’s composition and performance are based on the principles of British Standard BS 5215:1975. All performance and quality attributes must comply with the specified requirements, and test results should be rounded off according to IS 2-1960 guidelines.
Adhesion tests cover substrates such as aluminium, stainless steel, cement mortar, and glass (the latter tested after exposure to simulated sunlight through glass). The sealant must achieve an average peel strength of at least 25 N and limit adhesion failure to no more than 25% of the test surface area for aluminium, stainless steel, and cement mortar. For glass, similar peel strength and failure limits apply after sunlamp exposure. Additionally, cyclic adhesion tests restrict failure areas to 100 mm² or less after three cycles to verify durability.
Sealants must be packaged in containers that adequately protect the product’s integrity. Each package should clearly display the manufacturer's name or trademark, the quantity of sealant, and detailed instructions for use and storage. The packaging must also indicate the declared expiry date, ensuring the product is traceable and its shelf life is known. These labeling requirements guarantee proper handling and quality maintenance in accordance with the standard.
Sealants should be stored following the manufacturer's explicit instructions noted on the packaging, which typically address temperature, humidity, and protection from direct sunlight or freezing conditions. The sealant must satisfy all performance standards up to the declared expiration date. Proper storage ensures that after the shelf life, the product remains free from defects such as cracking or bubbling, and mass loss does not exceed 10% after heat aging tests.
Key tests include the recovery test, where the sealant must demonstrate at least 75% recovery after elongation with tensile forces between 25 and 300 N, and no significant material transfer upon cutting. Adhesion after heat aging requires the sealant to maintain at least the recovery test force and have adhesion or cohesion failure areas not exceeding 100 mm². Additionally, the sealant must meet all specifications until its expiry date under the recommended storage conditions. Curing should occur at ambient temperature and humidity, with primer application reported if recommended.
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