Is your project close to the coast? If your answer is yes you should be insisting on 316 marine grade stainless steel door hinges.
 
Finish: Satin Stainless
 
Height: 100mm
Width: 75mm
Thickness: 2.5mm
 
Pin: Fixed
 
Material: Solid 316 Marine Grade Stainless Steel
 
Timber Screws: Included
 
Unit: Each (not a pair)
 
Brand: Zanda Architectural