CARDITE #4PR
Rinse Additive for Pickled Steel

Promotes free rinsing and rapid drying. Prevents spots, stains and discoloration.

Inject into rinse water used after acid pickling. If multi-stage cascade rinsing is used, inject into next-to-last rinse stage. Since Cardite #4PR is a low-viscosity liquid, the feed rate can be accurately controlled by feeding into the rinse water through a metering pump or a venture injector. At usage levels, foam is not problem.

Recommended Use Dilution

0.5% solution
Equivalent to 0.64 oz/gal water = 1:199 water

Example: If rinse water inflow is 10 gallons per minute = 600 gallons per hour, inject Cardite #4PR at any of the following equivalent rates:

at.	3 gallons per hour,
or.	384 fluid ounces per hour,
or.	6.4 fluid ounces per minute,
or.	189 milliliters per minute.

Properties - Hazard Classes - Precautions

Physical form	liquid
Appearance	clear, pale amber
Odor	none
Specific Gravity	1.095
pH undiluted	4
Foam, 0.5% solution, agitated	15 mm maximum
Flash Point	none
Freeze Point	28F
Viscosity @ 65°F	low, 2 cp
Evaporation Rate (water = 1)	0.96
Solubility in water	infinite
Solubility in common petroleum distillates	zero
Manufacturing Chemists Association class	nonflammable
DOT hazard label required	none

Avoid contact with skin and eyes. Do not take internally. Keep out of reach of children. No unusual hazard is known. Mildly acidic as shipped.