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Protected Aluminium has a half wave coating of Silicon Oxide. Approx. 85% reflectivity.
Enhanced Aluminium has multi layer coating of dielectrics Approx. 95% reflectivity in a selected band. Both are durable.
The method of depositing the Aluminium also has a bearing on the durability. Some form of ion assist being superior to evaporative. Evaporative is less dense, and can absorb water.
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