Etching with Citrajet?
Q. My system has the following materials in it: CPVC, stainless steel, cast iron and copper; should I expect an 8% Citrajet solution to etch any of these materials?
A. No etching will occur on CPVC, Stainless Steel, cast iron and copper from 8% Citrajet. Cast iron might rust in the rinse water, especially if you use hot rinse water. Use water below 120 deg F to rinse cast iron and then dry quickly by removing rather than evaporating water if possible. (remove with a solvent, forced air/gas, or wipe).
Cleaning Aged Aluminum
Q. How to clean weathered oxidized or aged aluminum with a dark grey buildup of oxides especial architectural aluminum or decorations on buildings.
A. We do not have a product suitable for this but we do have recommendations. Citranox and Citrajet are well suited to cleaning freshly manufactured aluminum items, but not aged and weathered aluminum items.
Electronics Cleaner – Circuit Boards w/ Alodine
A customer needed to clean an assembly of a printed circuit board which had been sweat soldered to an aluminum plate/heatsink/carrier. The company needed a cleaner that would not attack the Alodine coated aluminum backside or the gold pockets or solder reflowed surface of the circuit board.
Unfortunately, the current cleaner was slightly base ph 9+ and the water slightly alkaline as well coming in at a ph of 8.0. This, along with other factors, caused staining, darkening and spotty discoloration of the 6061 Alodine coated (chemical conversion coating) aluminum parts.
Alconox Cleaners for Mechanical Washers
Q. Which Alconox cleaners are low foaming for use in mechanical washers?
A. Alconox, Inc makes both powder and liquid; acid and alkaline; and phosphate containing and phosphate-free low foaming cleaners. You need a low foaming cleaner for use in mechanical washers that rely on spraying to clean surfaces.
Removing Eudragit from Equipment
Eudragit brand coloring agents from Roehm GmbH & Co for coating tablets can be very difficult to clean from tablet coating equipment. Different Eudragits need different types of cleaning agents. Some require acid cleaners with wetting agents and dispersants, and some require alkaline cleaners with wetting agents and dispersants.