Patent ID: 8381493

Claim:
A compound semiconductor substrate packaging method comprising: a first step of inserting a compound semiconductor substrate into a gas-permeable, rigid container, placing the rigid container into a heat-sealable inner-packing pouch having an oxygen transmission rate of 1 to 100 ml·m −2 ·day −1 ·atm −1 , and a moisture transmission rate of 1 to 15 g·m −2 ·day −1 , replacing the air inside the inner-packing pouch with an inert gas, and heat-sealing the inner-packing pouch containing the inert gas to thereby hermetically seal the inert gas into the pouch; and a second step of placing the sealed inner-packing pouch, and a deoxygenating/dehydrating agent that absorbs or adsorbs at least either oxygen gas or moisture, into an outer-packing pouch that has an oxygen transmission rate that is 5 ml·m −2 ·day −1 ·atm −1 or less and is lower than that of the inner-packing pouch, and a moisture transmission rate that is 3 g·m −2 ·day −1 or less and is lower than that of the inner-packing pouch, and hermetically sealing the outer-packing pouch.