Regulatory change prompted a replacement search for n-propyl bromide
In the past, we cleaned the processed parts with n-propyl bromide (nPB) in an open machine. The components were cleaned in dip tanks and every single part had to be hand wiped after the cleaning process which was time-consuming. In 2017, nPB had been registered as a substance of very high concern (SVHC) under REACH (Registration, Evaluation, Authorization, and Restriction of Chemicals), which regulates the supply and use of chemicals in Europe. For nPB, a sunset date for July 4, 2020 was set, after which its use would be banned. Thus, there was a need for us to find soon an alternative cleaning setup that would offer reliable parts cleaning, while being environmentally compliant and safe for their workforce.
Safety, reliability and customer acceptance – Key criteria for finding a new cleaning solution
The alternative solution must comply with very specific criteria, as Ron Orchard, Production Manager at Wheelabrator Impact, explained: “The safety of our working staff is absolutely paramount. We wanted to make sure that their exposure to solvent was going to be minimal. At the same time, the solution should be one that is cost-efficient, reliable and fulfils highest cleanliness requirements and very importantly, would be approved and accepted by our customer base that includes Airbus and Boeing, amongst others.”
At the beginning of 2020, we started discussions with SAFECHEM and D&S Ultra-Clean Ltd., the UK distributor for the metal cleaning equipment manufacturer Union S.p.a. We decided on a Union closed cleaning system (MDMV2 PX) under vacuum. “Considering that the phase-out of nPB was approaching fast, one big advantage that Union offered to us was the relatively short build time of the machine. And having D&S Ultra-Clean Ltd. based in the UK with their servicing and installation for the machine was a huge benefit for us too”, added Ron Orchard. The Union machine would be running on DOWPER™* MC, virgin-grade and highly stabilized perchloroethylene supplied by SAFECHEM. The cleaning solvent caught our attention as it is already widely accepted and in use within the aerospace industry. There was no need to gain permission for using the product which saved time. “All the educational work SAFECHEM has done around the safe usage of perchloroethylene in closed cleaning machines, in combination with the SAFE-TAINER™ System, has given us additional confidence that DOWPER™* MC is the right product to go for!” noted Ron Orchard. The use of the SAFE-TAINER™ System developed by SAFECHEM – a closed-loop state-of-the-art solvent management system for the safe transport, storage and handling of solvents – in combination with closed cleaning equipment is considered to be the Best Available Technique (BAT) in the market.
Reduced solvent consumption & environmentally compliant parts cleaning
The machine was installed in October 2020 and since then we have received great service and support from D&S Ultra-Clean Ltd. The vast majority of the parts that we clean fits perfectly into the machine, which is equipped with an automated basket system. Parts are now 100% degreased in fully controlled and enclosed conditions. We have also signed up to SAFECHEM’s COMPLEASE™ Chemical Leasing, a tailor-made leasing package aiming to increase efficiency of the parts cleaning process with less resources. The offering covers supply of new solvent in the SAFE-TAINER™ System, waste handling, service elements to safely extend the working life of the solvent, along with staff training in process management to ensure a safe and efficient parts cleaning process – all for a monthly fixed fee.
“We used to spend a huge amount on replacing solvents. Now, thanks to the built-in distillation unit in the Union closed cleaning machine, used solvent can be constantly reused and recycled. This routine recycling means there are very low solvent replacement volumes necessary. This has allowed us to reduce our spend considerably, which in itself is a solid financial a argument to justify the investment of the machine.” On the question whether we would make the same choice again, Ron Orchard answered: “In a heartbeat. The impact on the environment that we have now is a fraction of what it was. We are clearly satisfied and SAFECHEM and D&S Ultra-Clean Ltd. have been reliable partners to us throughout the process. With the Union machine in combination with DOWPER™* MC, we have gained process control, plus improved health and safety for our operators.”
