NationMaster - Encyclopedia: Preform

A preform is the rough, incomplete and unused basic form of a stone tool formed by lithic reduction. Typically, a preform is the shaped remnant of a lithic core. Larger and thicker than the intended tool, it lacks the final trimming and refinement that is present in the completed artifact. Sometimes basic features such as stems and notches have been initiated. In most cases, the term refers to incomplete projectile point.

Indium Corporation » Solder Preforms (911 words)
	Preforms are available in a number of traditional shapes such as washers, discs, squares and rectangles.
	Die attach preforms are used to attach a silicon, germanium or III-V compound die to a substrate.
	Preforms are available in more than 220 alloys, with melting temperatures ranging from 47.0¡ to 1063¡.

Stage 9 (948 words)
	This is a proximal fragment of a preform resulting from the Face B channel flake plunging into the body during removal (right image).
	The lateral edges of the preform are not symmetrical and, as a result, the channel flake scars are not symmetrical.
	Preforms similar to this with beveled, serrated edges are very rare in the archaeological record.

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Encyclopedia > Preform

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