BS EN 4707:2020

What is BS EN 4707 about?  

BS EN 4707 is part of the series of European non-metallic materials standards for aerospace applications. 

BS EN 4707 specifies the acid pickling of aluminium and aluminium alloys free from hexavalent chromium. 

Who is BS EN 4707 for? 

BS EN 4707 on acid pickling of aluminium and aluminium alloys is relevant to: 

• Aerospace and Defense Industries 
• Manufacturers and suppliers of aluminium and aluminium alloys 
• Manufacturers of aerospace parts and components 
• Quality testing teams involved in the inspection of aerospace products 

Why should you use BS EN 4707?  

Pickling is a metal surface treatment used to remove impurities. 

BS EN 4707 covers all the requirements for acid pickling of aluminium and aluminium alloys. Toolings, fixturing, and metal tooling masking must be protected from corrosion and/or be free from corrosion or any deterioration detrimental to the treatment during their use. 

As a result, BS EN 4707 can help with: 

• Avoiding any retention of air or solution on the parts, 
• Allow the neutralisation and the suppression of the solutions during rinsing operations 
• Avoid any accidental contact during treatment between parts and tank equipment, and between various parts 

BS EN 4707 also walks you through the steps of pre-treatment, treatment, rinsing and drying. 

By adopting BS EN 4707, you can assess the reliability of materials thereby avoiding contamination, preventing corrosion due to oxidation and providing a uniform surface for the application. As a result, you could build trust and reliability for your products for use throughout the aerospace supply chain.