Performance characteristics of materials.
Technical principles
3.1.2 / 01
Papers and boards
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Polymer sheet and film
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Woods
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Metals
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Polymers
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Elastomers
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Biodegradable polymers
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Composites
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Smart materials
Exam practice from my notes
11 Give two reasons why photochromic lenses are used in glasses. [2]
Photochromic lenses automatically darken in bright UV light, reducing glare and improving visibility.
They help protect the eyes from harmful UV radiation by blocking UV rays.
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Modern materials
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