PBW will cause pits in certain metal alloys. Saw the one pic of a grinder that took damage.
Its not pitting the metal, it removes the anodized finish. Here is what happened to my SC Ti when I found this out the hard way . . .
Never put anything anodized into a PBW solution. PBW is safe on polycarbonate because it does not affect the elastomers or plasticizers like a solvent will. Thats why ISO ruins some plastics and rubbers. Thanks for taking the time and please keep us updated on your adventures . . .
Found an interesting article on making PBW at home:
http://unluckybrewing.com/homemade-pbw/ However doing this yields a different experience as PBW is formulated to counteract hard water so it has "buffers" in it.
Looks like it is a 30% sodium metasilicate, 70% oxiclean mix. This is the first time I found that ratio published online.
PRODUCT TECH SHEET
P.B.W.
Patent Nos. 5,663,132 & 5,789,361
Environmentally friendly, caustic replacement with
multiple uses.
_____________________________________________________________________________________
BENEFITS
- Replaces Caustic Soda cleaners
- Effective at All Temperatures
- Free Rinsing
- Safe on Polycarbonate surfaces
- Safe to handle
- Generates 4 - 5% Oxygen
- Non-hazardous & Non-corrosive
- Excellent hard water tolerance
- Removes protein soil and staining, baked on carbon, and fatty acids
DESCRIPTION
P.B.W. is a buffered alkaline detergent that has been proven to be more than an
effective substitute for caustic soda cleaners. Because of its unique formulation
of buffers and mild alkalis, it is safe on skin as well as soft metals such as stainless
steel, aluminum, and on plastics. P.B.W. uses active oxygen to penetrate carbon
or protein soils and is not effected by hard water. The oxygen also helps in
reducing B.O.D. and C.O.D. in wastewater, which is an added environmental
benefit.
P.B.W. has been formulated as a C.I.P. cleaner and is very effective in removing
protein soils found on brew kettles, fermenters, conditioning tanks, filters and all
packaging areas. The concentrations to remove these soils are typically in the
1% range. However, due to soil and water conditions this concentration will
vary. To help in hard water areas P.B.W. has been formulated with enough
chelators to tolerate hard water over 17 grains.
P.B.W. is an excellent choice as a soak cleaner because it does not require excessive heat as do most caustic based cleaners. This product has cleaned brass and copper filters, and industrial aluminum surfaces successfully.
PROPERTIES
APPEARANCE. . . . . . . . . . . . . . . . . . . . . . . . . . ……. . . . …... . . . . . . . .WHITE POWDER
RINSING ABILITY . . . . . . . . . . . .. . . . . . . . . . . . . . . . . …………. …... . . . . . . . EXCELLENT
FOAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ….. . . . . ……NONE ABOVE 100 ° F
pH OF 1% SOLUTION . . . . . . . . . . . . . . . . ….. . . . . . . . . . . . . . . .. . …... . . . . . . . .12.0%
GENERAL USE DIRECTIONS
CIRCULATION CLEANING: Use 1 to 3 ounces per gallon depending on soil load.
Heat to 130° to 180° F for 30 minutes.
CARBON REMOVAL: Use 6 to 8 ounces per gallon of water. Heat to 140 ° F for 4 hours or allow to soak cold overnight.
When using P.B.W. in food processing areas the equipment that has been cleaned must be rinsed with potable water. Just prior to use, sanitize the equipment in accordance with public health standards.
SAFETY
DANGER: Can be harmful if swallowed. Can cause eye irritation. Contains sodium metasilicate and sodium carbonate. FIRST AID: For contact with skin and eyes, flush thoroughly with cool running water. For eyes, flush for at least 15 minutes and get medical attention. If swallowed, do not induce vomiting. Drink large amounts of milk or water. Call a physician.