Stainless steel :

• Council of europe's policy statements concerning materials and aticles intended to come into contact with foodstuffs
  “guideline on metals and alloys used as food contact materials” (13.02.2002)

Aluminium alloy :

• BS EN 602-2004Aluminium and aluminium alloys. Wrought products. Chemical composition of semi-finished products used for the fabrication of articles for use in contact with foodstuff
• BS EN ISO 8442-2:1998. Materials and articles in contact with foodstuffs. Cutlery and table holloware Requirements for stainless steel and silver-plated cutlery.
• ASTM (2009), A 630-03, Method B (The stannomatic method).
• FDA BAM Online, (2001), Chapter 22A: Examination of Metal Containers for Integrity.
  http://www.fda.gov/Food/FoodScienceResearch/LaboratoryMethods/ucm072663.htm [Online]
• TIS 90-2530 (1987). Metal cans for foods and drinks. [มอก. 90-2530. มาตรฐานผลิตภัณฑ์อุตสาหกรรม: กระป๋องโลหะสำหรับบรรจุอาหาร.]