Polysulphide sealant, specifically pour grade polysulphide sealant, is a type of sealant commonly used in construction and civil engineering applications. It is a two-component sealant that cures to form a flexible, durable, and watertight seal. The two components typically consist of a liquid polymer base and a curing agent.

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Here are some key features and properties of polysulphide sealants:

1. Flexibility: Polysulphide sealants exhibit excellent flexibility, allowing them to accommodate joint movements and vibrations without cracking or losing their seal.

2. Chemical Resistance: They have good resistance to various chemicals, including fuels, oils, and some solvents, making them suitable for applications where exposure to such substances is expected.

3. Waterproofing: Polysulphide sealants provide effective waterproofing properties, making them commonly used for sealing joints in concrete structures, such as expansion joints in buildings, bridges, and dams.

4. Adhesion: They have good adhesion to a wide range of substrates, including concrete, metal, glass, and many plastics, ensuring a strong bond between the sealant and the surface.

5. Weather Resistance: Polysulphide sealants exhibit good resistance to weathering, including UV radiation, temperature extremes, and aging, which helps maintain the integrity of the seal over time.

6. Pour Grade: The term "pour grade" refers to the consistency of the sealant, which allows it to be poured or dispensed easily into horizontal joints or cracks. This makes it suitable for filling larger voids or sealing expansion joints in concrete pavements or other flat surfaces.

7. Cure Time: The curing time for polysulphide sealants can vary depending on the specific product and environmental conditions. Generally, they cure through a chemical reaction that takes place over several hours or days, forming a resilient rubber-like material.

It's important to follow the manufacturer's instructions and guidelines when using polysulphide sealants to ensure proper application and achieve the desired results. Additionally, safety precautions, such as wearing protective gloves and ensuring adequate ventilation, should be observed during handling and application.