Tech Support: (650) 273-2113

  Alumiprep 33 Aluminum Cleaner #680-115
Alumiprep 33 Aluminum Cleaner
Chemical Name:
Alumiprep 33
Phosphoric Acid

Detailed Product Description:

Alumiprep 33 is a non-flammable phosphoric acid-based cleaner, brightener

and pre-paint conditioner for aluminum. Alumiprep 33 produces a chemically

clean and corrosion-free aluminum surface.

Alumiprep 33 can be used to deep clean and brighten an aluminum surface prior

to welding, painting or to prepare the surface for a subsequent conversion coating.

Application Notes:

Typical treatment time (defined as the time Alumiprep 33 solution is in contact

with the metal surface) is between two and five minutes. It is normally applied at

temperatures between room and 120F. If drying does occur, re-wet the surface

with Alumiprep 33 solution, prior to water rinsing.

Alumiprep 33 solution should not be allowed to dry on the metal surface or

Permitted to re-oxidize prior to a thorough rinse. A thorough rinse with clean

water is necessary to remove both residual Alumiprep 33 solution and oils that

have been lifted from the metal surface.

A clean surface is a "water-break-free surface". The rinse water sheets out over

The aluminum surface, while oil remaining on the surface will cause the water to

bead up. Chemical cleaners will lift and break down oils on the surface and assist

in rinsing them from the surface on the metal.

Alumiprep 33 cleaning and conditioning chemicals will aggressively attack

Aluminum oxidation and corrosion to completely remove them, leaving a bright

clean metal surface. In the case of heavy corrosion, its removal can be aided by

the use of scrubbing. Often a Scotch-Brite pad is used for scrubbing.

Brush Application:

For light oxidation and corrosion removal dilute one part Alumiprep 33 with

five parts water. For heavy oxidation and corrosion removal dilute one part

Alumiprep 33 with two parts water.

Immersion Application:

For each 100 parts of bath, add 25 parts of Alumiprep 33 to 75 parts of water.

Spray Application using 62-G Applicator:

Set dilution control on 3 allowing a mix of one part Alumiprep 33 to three

parts water.


Before handling the chemical products used in the process, the first aid and

handling recommendations on the Material Safety Data Sheet for the product

should be read, understood and followed.

The processing bath is acidic. Do not get in eyes, on skin or on clothing. In

case of contact, follow the recommendations found in the Material Safety

Data Sheet for Alumiprep 33.

Alumiprep 33 should not be used on high copper bearing aluminum alloys

or aluminum castings.

Acid resisting (rubber, stainless steel or plastic) buckets, troughs or other suitable

container should be used to hold the diluted Alumiprep 33 solution. Ordinary

steel pails may be used, but only for a short time. Galvanized containers should

not be used.

Operators should be equipped with rubber gloves, aprons and goggles to avoid

contact with the solution. Adequate ventilation should be provided.

Storage Requirements:

Alumiprep 33 will freeze at 15 Fahrenheit. Freezing is not detrimental to the product.

It is recommended that the product be kept from freezing. However, should the

product freeze, simply thaw it in a warm place and stir it prior to use.

Waste Disposal Information:

Applicable regulations concerning disposal and discharge of chemicals should be

consulted and followed. Disposal information for the chemical products used in

this process is given on the Material Safety Data Sheet for each product.


Packed in 1-quart plastic bottle.


Click here to download pdf copy of MSDS

Click here to download pdf copy of Technical Process Bulletin

  Related products
Phosphoric Acid, 85% Concentration, Semiconductor Grade, 250ml
Phosphoric Acid, 85% Concentration, Semiconductor Grade, 250ml
See details

Price Each: $32.22