SD40 may refer to:
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Canon PowerShot SD40
The Digital IXUS (IXY Digital in Japan and PowerShot Digital ELPH in US and Canada) is a series of digital cameras released by Canon. It is a line of ultracompact cameras, originally based on the design of Canon's IXUS/IXY/ELPH line of APS came ...
, a digital camera
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EMD SD40
The EMD SD40 is an American 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division between January 1966 and August 1972. 1,268 locomotives were built between 1966 and 1972. In 1972, an improved version with new electroni ...
, a diesel-electric locomotive
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South Dakota Highway 40
South Dakota Highway 40 (SD 40) is a state highway in southwestern part of the US state of South Dakota. The highway is just over long and runs from U.S. Route 16A (US 16A) in Keystone to Bureau of Indian Affairs Highway 41 (BIA&nbs ...
* SD-40 alcohol, ethanol
denatured by adding
denatonium benzoate
Denatonium, usually available as denatonium benzoate (under trade names such as Denatrol, BITTERANT-b, BITTER+PLUS, ''Bitrex'', and ''Aversion'') and as denatonium saccharide (BITTERANT-s), is the most bitter chemical compound known, with bitter ...
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