What material is used for sealing waterproof casing?Generally speaking, we can use materials such as asbestos cement, asphalt, polystyrene board for sealing. Next, we will detail the pros and cons of each material to help you make a better choice.
What material is the waterproof sleeve sealed with.
a. Asbestos cement.
Asbestos cement, also known as asbestos expanded cement, is mainly used for pipe joints. The ratio is water:asbestos:cement = 1:3:7 (mass ratio). Asbestos is grade 4 or 5 asbestos and cement is 425 or higher Portland cement mixed with 10 to 20 percent total volume of water. The asbestos cement filler should be used up within an hour, otherwise the interface effect will be affected. After the initial setting time of cement is exceeded, the asbestos cement should be cured for more than 24 hours before the water can be tested.
Advantages: high strength, impact resistance, good water tightness, good adhesion.
Disadvantages: high labor intensity.
b.Oilseeds. Flaxseed is made by melting bitumen into a twisted shape and then filling the gaps with **.
Advantages: 1) waterproof, 2) heat insulation, 3) good elasticity, 4) constant strength, corrosion resistance, not easy to damage.
c. Polystyrene board.
Polystyrene board, also known as foam board or EPS board, is a white object made of polystyrene beads containing a volatile liquid blowing agent. It is molded in a mold and has the structural characteristics of a small closed cell.
d.PVC foam board.
PVC foam board is made of polyvinyl chloride as raw material. PVC is a material with good properties, such as water resistance, flame retardant, acid and alkali resistance, etc., available in a variety of colors (3 mm), and has the special advantage of uniform thickness.
Features: sound insulation, heat insulation, sound absorption, heat preservation, anti-corrosion, flame retardant, self-extinguishing, moisture-proof, mildew-proof.
e.Polysulfide sealant.
Polysulfide sealing paste is formulated with liquid polysulfide rubber as the base material. Self-curing and cross-linking at room temperature. It has good adhesion to metal and concrete and is resistant to expansion. It maintains good airtightness and water resistance during vibration and temperature changes, and has excellent oil, solvent and durability resistance.
How to use polysulfide sealant (adhesive) for application.
Before installation, polysulfide sealant (adhesive) should be used to remove oil, glue, dust and other debris on the adhesive surface, and ensure that the adhesive surface is dry to prevent bonding failure.
Fill the backing material: Fill the seams with the backing material according to the design conditions.
Application of primer: For projects that require primer, or to seal areas that have been permanently flooded, primer should be applied to the surface to be bonded and allowed to dry to form a film.
Preparation of sealant: Before use, the two components must be mixed evenly according to the ratio of the instructions. When mixing, the seal is pressed and filled so that no air bubbles are mixed when the adhesive is applied.
Waterproof enclosure and sealing practices.
Practice: In the 02S404 and 91SB atlases, asbestos cement and flaxseed are used for the installation and sealing of flexible and rigid waterproof casings. Its composition is as follows:
Asbestos cement: The ratio (mass ratio) of asbestos cement is water:asbestos:cement = 1:3:7. It is mainly used for pipe joints, also known as asbestos expanded cement. Asbestos cement is grade 4 or grade 5 asbestos. The cement must be made of Portland cement No. 425 or above, and then 10% to 20% of the total water is added for mixing. The asbestos cement filler should be used within 1 hour, otherwise the interface effect will be affected. Compared with the initial setting time of cement, the curing time of asbestos cement should be more than 24 hours before the water test.
Flaxseed: The main function of flaxseed is to act as a waterproof sealant on construction sites. Flaxseed is generally used for socket drainage cast iron pipes. The lead cleaning interface of the cast iron pipe of the water supply socket is marked with flaxseed to prevent lead cleaning. If it drip into the pipe, clear lead should be poured at the cement joint of the cast iron pipe at the drain outlet. Regenerate flaxseed first, then cement to prevent cement from entering the pipes. Flaxseed is highly resistant to corrosion and is not easy to rot.
Method: The gap between the waterproof casing and the pipe should be filled with asbestos rope fireproof material. Use pockmarks: Twist the hemp into a diameter of 15 times the hemp rope braided interface filling. Each loop of twine is woven and connected to each other. 0. per meter1 to 05。The twister should be tapped carefully and forcefully, and the depth of the twister should not exceed the inner edge of the triangular groove.