According to Master Bond, it cures without oxygen inhibition upon exposure to 405 nm LED light, followed by a short 30-45 minute heat cure at 90-95°C, making it well-suited for bonding heat sensitive components. LED415DC90Med passes ISO 10993-5 requirements for non-cytotoxicity and resists common medical sterilants, including glutaraldehyde, peracetic acid, ethylene oxide, and gamma radiation.
Unlike conventional dual cure adhesives that limit light penetration to approximately 1 mm, LED415DC90Med can partially cure or fixture sections up to 6 mm deep when exposed to 405 nm LED light at the appropriate intensity and for a sufficient duration. This deeper cure capability enables the fixturing of opaque components by allowing light penetration through the adhesive from the sides. A subsequent cure at 90-100°C for 30-60 minutes is recommended to optimize strength and overall performance.
LED415DC90Med has a thixotropic index of 5.53 at room temperature. It exhibits a tensile strength of 5,500-6,500 psi, a tensile modulus of 450,000-550,000 psi, and a lap shear strength exceeding 1,000 psi (aluminium to aluminium). This rigid system cures to a Shore D hardness of 85-90 with an elongation of 1-3% at 75°F. It is serviceable from -80°F to +350°F, electrically non-conductive (volume resistivity > 1014 ohm-cm), and bonds well to a variety of substrates, including plastics, glass, and metals. LED415DC90Med is available in syringes, ½ pint, pint, and quart containers.
Master Bond Medical Grade Adhesives
Master Bond's medical-grade systems are specifically formulated to comply with USP Class VI and/or ISO 10993-5 standards. Formulations include epoxy, silicone, UV- or LED-curable, epoxy-polyurethane blend, and cyanoacrylate chemistries.
In November, Master Bond launched EP21LSCL-2Med, a two component non-cytotoxic epoxy for bonding, sealing, coating and potting.
While most, if not all, epoxies will yellow over time, especially upon exposure to heat and intense UV light, EP21LSCL-2Med is expected to resist yellowing to a greater extent than conventional systems. This feature makes it ideal for imaging applications or other medical devices where optical clarity is needed.
EP21LSCL-2Med is an optically clear compound with a refractive index of 1.57. It has a high glass transition temperature of 110-120°C and a service temperature range of -60°F to +350°F (-52°C to +177°C). This system has a 100:20 mix ratio by weight and a low mixed viscosity of 600-900 cps at room temperature. It is a moderate heat cured epoxy which features a gel time of six to eight hours at room temperature for a 100-gram batch. EP21LSCL-2Med cures at room temperature followed by a post cure of 3-5 hours at 140-175°F (60-80°C).
