STR Holdings, Inc., together with its subsidiaries, operates as a plastic and industrial materials research and development company in the United States, Spain, India, and China. The company designs, develops, and manufactures encapsulants that protect the embedded semiconductor circuits of solar panels for sale to solar module manufacturers; and multi-layer films for packaging applications, such as meat, fish, cheese, yogurt, fruit, cereals, snack foods, etc. Its encapsulants can be used in crystalline silicon and thin-film solar modules. STR Holdings, Inc. was founded in 1944 and is headquartered in Enfield, Connecticut. STR Holdings, Inc. is a subsidiary of Zhen Fa New Energy (U.S.) Co., Ltd.