ANTIOX PC-L

Description:

ANTIOX PC-L is a copper surface treatment designed to enhance the adhesion of aqueous dry film photopolymers, retard oxidation during processing, and aid in rinsing and drying.

Properties:

Form:                              Clear, amberliquid
pH (as supplied):          3 to 4
Specific gravity:           1.02
Weight/Gallon              8.5 lbs
Solubility, water:          Infinite
Flash point:                   >200°F
Odor:                              Mild, characteristic
Yield:                             5000 sq ft/gallon

Applications:

ANTIOX PC-L is an adhesion promoter and process aid for use with all dry film resists, but works especially well with some of the newer resists that are generally not compatible with oxidation inhibitors. ANTIOX PC-L should be evaluated whenever resists are subject to unusually aggressive plating baths.

Directions For Use:

ANTIOX PC-L is designed for use only in dilute sulfuric acid solutions.

Electroless Copper: A dedicated tank must be used for this bath. Do not use the post-electroless neutralizing bath for the ANTIOX PC-L in this application.
Sulfuric acid make-up: Add sulfuric acid to water to make a 2 - 3% by volume solution (ALWAYS add acid to water, NEVER add water to concentrated acid).

ANTIOX PC-L addition:
Concentration:                             Add 5 - 10%** PC-L by volume to the acid bath. Mix well.
Temperature:                                  85°F ± 5° F
Time:                                              1 to 5 minutes
Agitation:                                      None required
Filtration:                                       Recommended
Drier temperature:                          150° ± 10° F
Operation:                                     Immersion or spray

**5% make-up is normal. Higher levels may be needed to compensate for abbreviated contact times or low bath temperatures.

Equipment:

TANKS: polypropylene, polyethylene, PVC, PVDC

RACKS: 316 Stainless Steel

HEATERS: Titanium

PUMPS: polypropylene, polyethylene, PVC, PVDC

FILTER HOUSING: PVC, polypropylene

FILTER ELEMENT: polyproplyene, 20 micron

PLUMBING: PVC, polypropylene

Maintenance:

Acid Content: maintain sulfuric acid between 2% and 3%. Higher acid levels can be used provided that rinsing is adequate to prevent staining.

Bath Strength: Maintain PC-L at not lower than 3%, and preferably at 4 -5% or higher if necessary for optimum results

Control:

SQUARE FOOTAGE: keeping track of the square feet of copper processed through the Antiox bath can greatly reduce titration frequency. Calculate as follows: theoretical bath yield is 500 sq. ft. per gallon working bath including allowance for drag-out. Thus, 200 sq. ft. per gallon will reduce a fresh bath to 60%. A 100 gallon bath will therefore process 20,000 sq. ft of copper (200 sq. ft. X 100 gals.) before requiring replenishment. When using square footage count to monitor the bath, titration analysis should be done every fourth replenishment. Do not operate the Antiox bath below the minimum strength of 60% or below a minimum temperature of 70°F.

Titration Procedure:

Titration procedure for Sulfuric Acid:

1. REAGENTS
   1. 0.1 normal sodium hydroxide
   2. Phenolphthalein indicator solution
2. APPARATUS
   1. One 5 ml pipet
   2. One 50 ml buret
   3. One 250 ml beaker
3. PROCEDURE
   1. Pipet 5 ml of working bath into 250 ml beaker
   2. Add 150 ml distilled water
   3. Add 3 drops indicator solution
   4. Titrate with 1.0 normal NaOH to a pale pink end point
4. CALCULATIONS
   1. ml of titrate X 9.8 / 1.8354 = ml/liter
   2. Divide milliliters by 1000 to get % by volume

    

Titration procedure for ANTIOX PC-L:

1. REAGENTS:
   1. Silver nitrate, 0.1 normal
   2. Amm Hydroxide AR Grd (30%)
   3. Nitric Acid, AR Grd (70%)
   4. Ferric ammonium sulfate, AR Grd. (crystals)
   5. Ammonium thiocyanate, 0.1 normal
   6. Distilled water (chloride free)
2. APPARATUS:
   1. 500 ml beaker
   2. One 5 ml pipet
   3. Two 10 ml pipets
   4. One 50 ml buret
   5. A 50 ml & 100 ml measuring cylinder
   6. A 500 ml Buchner funnel & vacuum flask
   7. No 5 Whatman filter paper (5.5 cm for 6 cm funnel)
   8. Whatman cellulose powder, type CF-1
   9. Vacuum pump (Nalgene #6130-0200)
3. INDICATOR SOLUTION
   1. To 80 grams of AR Grade Ferric Ammonium Sulfate, add 10 ml of concentrate (70%) Nitric Acid
   2. Add distilled water to 200 ml
   3. Stir with mild heat
   4. Bottle and label
4. PROCEDURE:
   1. Pipe 10 ml sample from working bath into 500 ml beaker and add 125 ml distilled water
   2. Add 5 ml conc Ammonium Hydroxide and 10 ml of 0.1 Normal Silver Nitrate. Stir well and let stand for 5 minutes to allow coagulation of precipitate.
   3. Add 3 gms of cellulose powder to aid filtration. Mix well and vacuum filter through the Buchner funnel using #5 Whatman paper. Be sure to transfer all the solution and precipitate.
   4. Wash beaker with 3 X 50 ml portions of distilled water. Pour each increment through the filter allowing the vacuum to dry the filter cake between each flushing return clear, filtered solution to the 500 ml beaker.
   5. Slowly stir 10 ml conc. Nitric acid into clear filtrate.
   6. Add one (1) ml of indicator (#3)
   7. Titrate to a pale orange end point with 0.1 normal Ammonium Thiocyanate.
5. CALCULATIONS
   1. Percent bath strength = [(10 X 0.1) - (B X 0.1)] X 11.91
   2. Where B = ml of Ammonium Thiocyanate used.
6. REPLENISHMENT:
   1. Determine bath strength in percent
   2. Subtract % bath strength in gallons from original make-up and add the difference to replenish the bath
   3. Example: a 60 gallon bath @ 5% make-up = 3 gallons. A 3.5% titration = 2.1 gallons (.035 X 60) Subtract 2.1 from the original 3 gallon make-up - 0.9 gallons of concentrate (add 1 gallon).

Removal:

The ANITOX PC-L oxidation inhibitor treatment must be removed prior to pattern plate. It is easily removed with normal preplate cleaning methods.

Safety:

Do not use ANTIOX PC-L with NITRIC ACID, FLUOBORIC ACID, CHROMIC ACID, MURIATIC ACID, HYDROFLUORIC ACID, or with any OXIDIZERS or ETCHANTS.

ANTIOX PC-L should be used in accordance with good safety practices. Wear a face shield, apron, gloves, and any other appropriate safety equipment when mixing or handling this product. In case of skin contact, flush with copious quantities of fresh, cool water. In case of eye contact, flush immediately with cool fresh water for at least 15 minutes and consult a physician. In case of accidental ingestion consult a physician immediately.

Disposal:

Should there be drag-in of copper from the electroless copper bath, do not attempt removal through an EDTA resin bed as the PC-L competes with the chelater for the copper.

Storage:

Keep containers sealed. Keep partial containers closed at all times. Store product away from sources of direct heat. Keep away from oxidizing agents.

Shelf Life:

Anitox is guaranteed for (1) year from date of receipt in unopened containers.

Containers:

Five gallon pails and 55 gallon nonreturnable plastic drums.

Classification:

National Motor Freight Classification NO. 44425
DOT Hazardous Material Description: Water-based glycol solution

The information contained herein is based on our experience and is believed to be reliable. However, since methods and conditions of use of our products as described are beyond our control, both the product and instructions for its use are offered without warranty, expressed or implied. No information on this data should be construed as a recommendation by DURATECH INDUSTRIES, INC., to use any product in contravention of any patent right.