Why only MacBook Pro retainer bottom case shows white particles?

Any user have that issue for any Macs .
But I sure that at home three MacBook Pro & Air , retainer display , only retainer shows white particles!
Whole body only bottom case problem .the answer was material problem! Repair job no : R 87983663

Level 1 (0 points)
Michael tim
Re: 15.4"MacBook Pro retainer display bottom case shows white particles ? May material problem?
2013/3/31 下午 6:01 (in response to sig)
Pure aluminum is soft and rich ductility, but the majority of commercial aluminum require greater strength than pure aluminum.
So it is necessary to add other elements to produce a variety of alloys to achieve this requirement.
By rolling with the different levels of the heat treatment process can produce the strength 2kg/mm2 ~ 60kg/mm2 strength level of the product, to apply to the products of various strength requirements.
This solved my questionThis helped me
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