Profile strength: the tensile strength of good doors and windows should reach 157 n/m2 and yield strength is required to reach 108 n/m2. When aluminium door sliding of aluminium alloy of storefront choose and buy, owner people can use hand moderate bend profile, after letting go should be able to answer undisturbed state.
Surface chroma: good profile of aluminium alloy door window is same colour and lustre of aluminium alloy profile should be consistent, if chromatic aberration is very obvious, unfavorable choose and buy.
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