Background: Sealing Challenge of Micro Switches Micro Switch is a high-precision mechanical switch commonly used in automotive electronics, home appliance control, power tools, and industrial equipment. Its structure is compact and responsive, but at the same time it is extremely fragile – especially when facing high humidity, dust, oil pollution, thermal shock and other environments, the internal contacts are easily corroded or short circuited, leading to signal failure. Therefore, higher requirements have been placed on the waterproof, moisture-proof, and insulation protection of micro switches during the manufacturing process. Using appropriate potting compound for internal sealing has become a key step in improving product reliability and lifespan. 2、 Requirements for adhesive used for waterproof sealing of micro switches The housing of micro switches is often made of PA66+30% GF or PBT+30% GF materials. These reinforced engineering plastics have excellent mechanical strength and dimensional stability, but have low surface energy and difficult adhesion. When selecting sealing materials, it is important to pay attention to the following indicators: one ️⃣ The viscosity range is moderate (3000~5000 mPa · s), ensuring that the colloid can fully flow into the gap and cover the contacts; two ️⃣ The curing process has low heat release and minimal shrinkage, avoiding deformation of the plastic shell caused by thermal stress; three ️⃣ Good compatibility with fiberglass reinforced nylon and PBT, ensuring long-term adhesion; four ️⃣ Excellent waterproof, moisture-proof, and insulation performance, meeting IPX7 protection requirements; five ️⃣ Good temperature and chemical resistance, suitable for long-term working environments ranging from -40 ℃ to 125 ℃. 3、 Recommended solutions: EP 1702&EP 2003S epoxy sealant ✅ Recommended Product 1: ELAPLUS EP 1702 Universal Micro Switch Waterproof Sealing Adhesive EP 1702 is a cost-effective electronic potting adhesive designed specifically for the sealing and protection of general electronic devices and circuit boards. It can cure at room temperature, is easy to operate, and does not require additional heating equipment. Main performance advantages: Moderate viscosity and good fluidity; Low heat release during solidification, low volume shrinkage rate, and avoidance of stress cracking; After curing, the surface is bright and dense, with outstanding waterproof and moisture-proof effects; Excellent electrical insulation performance ensures stable operation of contacts; Strong universality, reasonable cost, suitable for large-scale production scenarios. Typical applications: Micro switch encapsulation Sensor sealing Motor lead out packaging Small control module waterproof and moisture-proof ✅ Recommended Product 2: ELAPLUS EP 2003S High Adhesion Micro Switch Waterproof Sealing Adhesive EP 2003S provides stronger interfacial bonding for silver plating or metal substrate adhesion challenges. The 2:1 weight ratio mixed curing system can react rapidly at room temperature or under heating conditions to form a tough protective layer. Core features: Excellent adhesion to various substrates such as metals, plastics, ceramics, etc; High shear strength and peel strength, good toughness after curing, and less prone to brittle cracking; Excellent high temperature resistance, suitable for long-term working environments of 80-125 ℃; Excellent impact resistance, oil resistance, acid and alkali resistance; It can effectively improve the oxidation and corrosion resistance of metal parts such as silver plating layers. Applicable fields: Micro switch metal terminal encapsulation Bonding of iron core and motor magnetic steel Packaging of power reactors and sensor modules Soft magnetic components, high-temperature resistant electronic encapsulation Make the switch ‘leak proof’ Although small, micro switches shoulder the mission of sensitive response and safe closing of electronic control systems. Choosing the appropriate epoxy sealant can not only effectively block moisture from entering, but also extend the service life of the switch, allowing the equipment to maintain precision and reliability even in harsh environments. ELAPLUS epoxy encapsulation series provides high-strength, high sealing, and high stability system solutions for your electronic protection. Tags: EP1702 · PBT potting · Micro switch potting adhesive · Micro switch waterproof potting · Epoxy potting adhesive
