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Surround treated apple with half untreatedSURROUND forms a white barrier coating on crops, which helps to protect them from sunburn and heat stress. The particle barrier is specially designed to allow usable light through while blocking harmful infrared (IR) and ultraviolet (UV) light.

The technology behind Surround crop protectant was co-developed by Engelhard Corporation and the US Department of Agriculture and is referred to as ‘particle film’ technology. Comprised of specially modified particles of kaolin, a naturally occurring material, Surround is mixed in water and sprayed onto crops. Upon drying, a fine white film results. If Surround is applied to an edible part of the plant the film can be washed off at harvest, or spraying can cease early in the season and the deposit weathers off naturally.