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Product Description

Houghto-Prep ZP4 is a cleaner and self-limiting coater using spray to waste wand applications for ferrous, aluminum, and other non-ferrous components in preparation for paint and other organic coatings. Houghto-Prep ZP4 cleans and coats faster for short dwell times. The Houghto-Prep ZP4 displaces surface soils/oils and using an efficient proprietary zirconium phosphate chemistry, producing an amorphous coating that promotes paint adhesion and salt spray resistance.

Houghto-Prep ZP4 is used at 2 to 5% by volume at the nozzle at 85 to 110° F. The high cleaning efficiency of the product ensures effective cleaning of even heavily soiled components. The coating is formed during cleaning giving a single step process. The coating gives equivalent to superior salt spray corrosion protection and excellent adhesion to subsequently applied topcoats as compared to iron phosphates.


Cleaner performance can be affected by extremes of water quality. Hard water (in excess of 300 ppm CaC03) and high levels of sulphates and chlorides can reduce the stability of emulsions and reduce corrosion protection. Your Houghton Representative can advise on local water quality.


Houghto-Prep ZP4 can be controlled by using a simple acid-base titration as follows: 1. Place a 25 ml sample into a clean beaker. 2. Add 3 to 5 drops phenolphthalein indicator. 3. Titrate with 0.1 N NaOH from clear to pink. 4. mis required X 1.0"' % by volume.

Features & Benefits

  • Free Rinsing
  • Low Solids
  • Multiple substrate capability