Sonotech developed environmentally benign couplants to minimize NDT's impact on the environment. These couplants contain biodegradable materials safe for leave-on applications and an environmentally benign ferrous corrosion inhibition system for steel. Sonotech's environmentally benign couplants have low skin irritation potential, contain no dye or fragrance and will not stain clothing. All couplants in this category meet nuclear power specifications for Halogens, Sulfur and low melting point metals.