Sealing Compounds and Coating
Sealing compounds and coatings insulate electrical systems to prevent leakage and protect the system from oxidation. Sealing improves safety, creating physical barriers that minimise leakage of gasses and electrical current. A drain seal, in places where moisture accumulates, allows water to exit safely without causing shorts. Sealing compounds are made in different types, with different characteristics. Silicone based adhesives, the most common variant, are suitable for metal, rubbers and plastics. Casting compounds are of many sub-variants, such as two-component sealing compounds and transparent resins. Different variants are best suited for different applications, such as sealing assemblies, relays and transformers, sealing objects with a high amount of ambient temperature, and more. Cable joining resins offer excellent adhesion, even on moisture and dust-laden surfaces, and can be removed easily. The best sealing compounds offer a thorough seal, with thermal stability, water-proofing and oil-resistant capabilities. Check for the dielectric strength of the adhesive or the maximum voltage that can be applied without the adhesive melting or giving way, as an indicator of quality. High-quality adhesives comply with standards such as IEC 60243 that deal with the electrical strength of insulating materials. Effective application of sealing compounds may require accessories, such as a painter’s spatula and adherence to the correct procedure.