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Mylar coated with a sheet of red photographic Mylar is used for artwork (layout) because,

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in Linear Integrated Circuits by (39.8k points)
Mylar coated with a sheet of red photographic Mylar is used for artwork (layout) because,

(a) It is used to get a colourful layout

(b) It can be easily peeled off from layout

(c) It is recommended colour for layouts

(d) It is used for highlighting layout

The question was posed to me in semester exam.

My doubt is from Basic Planar Process topic in section IC Fabrication of Linear Integrated Circuits

1 Answer

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by (39.8k points)
Accurate answer is (b) It can be easily peeled off from layout

Simplify with an easy explanation: For photographic purpose, artwork should not contain any line drawing but must be of alternate clear and opaque region. The red layer can be easily peeled off thus exposing clear areas with a knife edge from regions where impurities have to be diffused.

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