Patent ID: 8168272

Claim:
A storage container for containing a synthetic quartz glass substrate for use as photomask, the glass substrate having front and back surfaces, said storage container comprising: a first inner wall; a second inner wall opposite to the first inner wall; a third inner wall; a fourth inner wall opposite to the third inner wall; a single pair of a first channel on the third inner wall and a second channel on the fourth inner wall, the first channel being facing the second channel each other, an area being formed between the first channel and the second channel, the area facing the first inner wall and the second inner wall, the area being to house the glass substrate; a first reservoir for an absorber on the first inner wall; a second reservoir for the absorber on the second inner wall, the absorber absorbing components outgassing from the container; a lid having a mating line, wherein the mating line achieves hermetic sealing of the container, wherein a ratio A/B is in the range of 1.0 to 120 m 2 /cm 2 provided that A is a product (m 2 ) of the total weight (g) of the absorber multiplied by the BET specific surface area (m 2 /g) of the absorber and B is the total area (cm 2 ) of the front surface or the front and back surfaces of the glass substrate facing the first and second inner walls provided with the first and second reservoirs, wherein at least one of the first and the second reservoirs is disposed at a position that the longest straight distance L (mm) between said at least one of the first and the second reservoirs, and the glass substrate opposed thereto is within 800 mm.