Chemically resistant, non-drip epoxy system 05 November 2021

Master Bond EP41S-5ND Black is a two part, NASA low outgassing rated epoxy, with outstanding chemical resistance to acids, bases, alcohols and fuels. Most significantly it will withstand liquid immersion to harsh chemicals such as methylene chloride, phenol (10%), and nitric acid (30%).

Containing no solvents, this system cures at room temperature or more rapidly at elevated temperatures. It provides a high glass transition temperature of 140°C to 150°C, and exceptional electrical insulation properties, with a volume resistivity greater than 1,014 ohm-cm.

“EP41S-5ND Black is designed for bonding and sealing applications, wherein a non-sag, paste like consistency is required,” says Rohit Ramnath, senior product engineer at Master Bond. “The optimum curing schedule is overnight at 23.8°C followed by 3 – 4 hours at 65.5°C – 93.3°C. In applications where long-term chemical resistance is critical, the importance of post curing with heat cannot be overstated.”

EP41S-5ND Black has a good physical strength profile with a tensile strength measuring between 10,000 psi and 12,000 psi, and a tensile lap shear of 900 psi – 1,100 psi, both at room temperature. It is serviceable over the temperature range of -62.2°C to +232.2°C. This compound adheres well to a variety of substrates such as metals, composites, glass, ceramics and many plastics and rubbers. As indicated by the product name, its colour is black and it is RoHS compliant. Packaging is available in ½ pint kits, pint kits, quart kits and gallon kits.   

Deputy Editor

Claire Aldridge Deputy Editor t: +44 (0) 1727 743 889


Having joined the magazine in 2012, Claire developed her knowledge of the industry through the numerous company visits, exhibitions and conferences she attended both in the UK and abroad.

Claire prides herself on keeping readers well informed and up to date with the latest industry news.