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LOCTITE EA M-21HP Medical Device Epoxy Adhesive for Glass Plastic and Metal Bonding
LOCTITE EA M-21HP Medical Device Epoxy Adhesive for Precision Device Assembly
LOCTITE EA M-21HP Medical Device Epoxy Adhesive is a two-part, medium-viscosity structural bonding system developed for disposable medical device assembly and precision multi-material applications. After the resin and hardener are mixed, the off-white adhesive cures at room temperature to form a tough bond line with strong peel resistance and high shear strength. It bonds a wide variety of substrates, including glass, metals, and selected plastics, making it suitable for manufacturers that need dependable adhesion across dissimilar components.
The product is designed around a 2:1 resin-to-hardener ratio by volume, or 100:55 by weight. Its approximately 20-minute working life gives operators enough time for dispensing, positioning, and fixture adjustment, while a typical tack-free time of about 40 minutes supports efficient production planning. When fully cured, LOCTITE EA M-21HP Medical Device Epoxy Adhesive provides useful resistance to chemicals and solvents and also functions as an effective electrical insulator.
Key Benefits of LOCTITE EA M-21HP Medical Device Epoxy Adhesive
LOCTITE EA M-21HP Medical Device Epoxy Adhesive combines practical processing with durable mechanical performance. The medium-viscosity consistency supports controlled bead placement without excessive running, and the cured material offers high peel resistance for joints exposed to handling, impact, vibration, or thermal movement. Henkel’s published data also shows strong adhesion to materials such as steel, aluminum, stainless steel, polycarbonate, PVC, ABS, glass, and epoxy-glass under specified test conditions.
The adhesive has been tested under Henkel protocols based on ISO 10993 biocompatibility standards to assist material selection for the medical device industry. This testing can support initial product evaluation, but it does not replace validation of the completed medical device. Manufacturers must confirm compatibility with the final substrates, production process, cleaning method, sterilization method, exposure conditions, and applicable regulatory requirements.
Applications for LOCTITE EA M-21HP Medical Device Epoxy Adhesive
Typical uses include disposable medical devices, diagnostic components, filters, connectors, housings, tubing assemblies, sensors, and plastic-to-metal or glass-to-metal joints. LOCTITE EA M-21HP Medical Device Epoxy Adhesive can also be considered for precision industrial parts where a tough, electrically insulating bond is required.
Henkel notes that products similar in composition have shown excellent bond-strength retention after ethylene oxide and gamma-radiation sterilization. LOCTITE EA M-21HP also maintains bond strength after one steam-autoclave cycle. Manufacturers should test completed parts using their intended sterilization process and consult Henkel when devices may experience multiple sterilization cycles.
How to Apply LOCTITE EA M-21HP Medical Device Epoxy Adhesive
For maximum performance, remove paint, oxide films, oil, dust, mold-release agents, moisture, and other contaminants from both surfaces. When using a dual cartridge, first confirm that both components flow evenly, then attach the correct static mixing nozzle. For hand mixing, combine the required quantity thoroughly and continue mixing for approximately 15 seconds after a uniform color is reached.
Apply the mixed adhesive evenly to both surfaces and complete assembly within the available working time. Keep the components correctly aligned and prevent movement during curing. A bond-line thickness of approximately 0.1 to 0.2 mm is recommended for maximum shear strength. Allow the assembly to cure at approximately 25°C for 24 hours to develop high strength. Controlled heating up to 93°C can accelerate curing when the components and manufacturing process permit it.
Storage and Safety of LOCTITE EA M-21HP Medical Device Epoxy Adhesive
Store LOCTITE EA M-21HP Medical Device Epoxy Adhesive in its unopened original container in a dry area. The recommended storage range is 8°C to 21°C, and prolonged storage below 8°C or above 28°C may affect product properties. Wear suitable gloves, avoid direct contact with skin and eyes, and follow the current safety data sheet. Do not use the product in pure oxygen, oxygen-rich systems, or with chlorine and other strong oxidizing materials.
For medical device manufacturers seeking a reliable two-part epoxy for glass, plastic, and metal bonding, LOCTITE EA M-21HP Medical Device Epoxy Adhesive offers controlled dispensing, room-temperature curing, and durable bond performance. Explore our medical device structural adhesives for additional solutions suited to disposable devices, diagnostic equipment, filtration components, and precision healthcare manufacturing.
