Case Study – Use of non-aqueous developers containing propan-2-ol

  •  

July 2016

 

Customer

Our customer manufactures light alloy cast components in aluminium and magnesium, using sand, lost wax and gravity die processes. The components they manufacture range from helicopter gearboxes to small aerospace parts. They carry out inspection of components using our ZYGLO® ZL-60D level 2 water-washable fluorescent penetrant. They then use ZYGLO® ZP-9F as their approved non-aqueous wet developer.

 

Challenge

Our customer had a question regarding updates to the NADCAP audit criteria which was revised in 2013. This criteria stated that ‘where non-aqueous wet developers (NAWDS) are in use, can the supplier provide evidence that the constituent breakdown of the carrier fluid is equal to or less than 50% propan-2-ol (RRP58003 3.1.5.1.2)’.

 

Background

Magnaflux EMEAR non-aqueous (also known as solvent-based) developers utilise fast-drying solvents containing white developer particles. When applied to the surface being inspected, the solvents evaporate quickly to leave a thin fine layer of these particles. In the Magnaflux EMEAR range, we carry two non-aqueous developers: SPOTCHECK® SKD-S2 and ZYGLO® ZP-9F.

Both developers consist of a blend of inert inorganic particles dispersed in a mixture of propan-2-ol (also known as isopropanol, isopropyl alcohol) and acetone.

The concern about using developers which contain more than 50% propan-2-ol is a historic one. Specifically, it relates to the slower rate of evaporation of propan-2-ol versus acetone, which could bring about issues in cold and/or damp conditions. However, in practise, the difference is not significant.

The reason for using a blend of propan-2-ol and acetone in our non-aqueous solvents is to control the evaporation rate from a surface. In aerosol form, both SKD-S2 and ZP-9F have propan-2-ol concentrations less than 50%.

 

Solution

ZP-9F is widely used in aerospace inspection applications, which led to us measuring the precise concentration of the propan-2-ol for each manufactured batch of product. This information is available on our Batch Inspection Certificates which are available to download from this website.

 

Results

A key need for our customer was to have documented evidence regarding the level of propan-2-ol in ZP-9F. Having the level of propan-2-ol for each specific batch of material ensured that they had a robust backup system and could satisfy any auditor raising this as a question.

 

 

 

“Access to the online Batch Inspection Certificates for ZP-9F, where the level of propan-2-ol is recorded, is a real plus here. Documentation like this is excellent for supporting on-site audits.”

Subscribe to Magnaflux News:

Magnaflux

Faraday Road, South Dorcan Industrial Estate
Swindon, Wiltshire, SN3 5HE, UK
Telephone: +44 (0)1793 524566
Fax: +44 (0)1793 490459
Contact Magnaflux Customer Service

Select Your Country North America Mexico Brazil China Europe Russia India New Zealand, Australia, Japan, Southeast Asia
© 2019 Magnaflux - all rights reserved.
top

We have placed cookies on your computer to give you the best possible experience with our website. These cookies are also used to ensure we show you advertising that is relevant to you. If you continue without changing your settings, you are agreeing to our use of cookies to improve your user experience. You can click the cookie settings link on our website to change your cookie settings at any time.