Master Bond‘s Supreme 70CN is a two-part epoxy adhesive that’s formulated using a natural, renewable, and sustainable ingredient. This moderate viscosity unfilled epoxy is black in color and can be used for bonding, sealing, coating, and potting. As a toughened system, it resists thermal cycling and is ideal for bonding dissimilar substrates.
“As part of Master Bond’s sustainability drive, this product offers the advantage of lowering the carbon footprint. At the same time, it does not compromise performance and features a high-tensile strength of over 10,000 psi and a glass-transition temperature of 125 to 130° C,” says Rohit Ramnath, senior product engineer.
Supreme 70CN bonds well to a wide variety of substrates including metals, ceramics, many rubbers, plastic materials, and composites, with low shrinkage upon cure. It passes NASA’s low-outgassing specifications, offers excellent chemical resistance, and is serviceable from -100° to 400° F.
This system also offers high-volume resistivity exceeding 1014 ohm-cm and has a relatively low exotherm. The product has a Shore D hardness of 75-85 at room temperature.
The formulation exhibits very good flow properties with a mixed viscosity of 2,500 to 5,000 cps and a convenient working life of 60 to 90 minutes. The optimal cure schedule is overnight at room temperature, followed by four to five hours at 140° to 170° F.
The Supreme 70CN can be used in aerospace, electric vehicle, electronic, opto-electronic, battery, and OEM applications — particularly those involving composites and fibers. In addition to specialty packaging in the form of premixed and frozen syringes and syringe kits, it’s available in standard packaging of one-half-pint, pint, quart and gallon kits.