GaAsWafers.com uses a lot of terms and abbreviations that are not familiar to everyone. If you are confused about something that does not appear on this list, please send us an e-mail at sales@GaAsWafers.com.

Term	Explanation
µm	Micrometer - one one-thousandth of a millimeter.
P/E	Front side polished, back side alkaline etched.
P/P	Both sides polished.
Empak	Empak cassettes are the most common cassettes used for shipping silicon wafers. These hold a maximum of 25 wafers each.
Prime	Prime grade - our wafers are high quality and confirm to industry standards.
Ωcm	Ohm*cm, the unit of measure for resistivity.
SEMI	SEMI is the industry association that sets standards for semiconductor wafers.
Flats	Wafers are essentially circular disks. Flats are a method used to convey crystallographic orientation and dopant typing by removing small sections of the wafer along the edge of that disk, which produces a flat boundary in what would normally be the round/circular boundary of the disk. A maximum of 2 flats are used, with the major (primary) flat typically indicating the {110} orientation.