MAR MN-63 is designed to desmear and increase resin surface activity promoting reliable electroless copper interconnection, coverage and adhesion. It can be used on a variety of resin systems including polyimide.
MAR MN-63 can also be used as a secondary method of hole preparation subsequent to sulfuric acid, chromic acid or plasma desmear\etchback.
Advantages of the MAR MN-63 process include
- Removes drill smear and debris
- Consistent etch rate
- Process can be regenerated
When the solids in the MAR MN-63 solution has reached 25% by weight as determined by the % solids analysis, the bath should be replaced.
||55 – 65 grams/litre
||5 - 8% BV
||70 - 80ºC
||Subject to resin
||Subject to resin
ANALYSIS OF MAR MN-63A
- Reagents Required
- Saturated barium hydroxide
Add 80 grams of barium hydroxide per liter of DI water. Stir for 15 minutes. Allow undissolved material to settle, then decant the solution and store in a tightly closed plastic bottle.
pH – 12.9 barium hydroxide solution. Standardize pH meter to 10, read above barium solution and adjust pH to 12.9 with barium hydroxide.
- 20% by volume nitric acid solution
- 10% by weight potassium iodide solution
- 0.10N sodium thiosulfate solution
- 2% starch indicator solution
- Vacuum filter a hot (120ºF) 50 ml sample of the working bath through a glass fiber filter. Glass fiber filter paper must be used. Paper filter papers will result in erroneous results.
- Pipette 2 ml of the filtrate prepared in Step 1 into a beaker containing 10 ml of saturated barium hydroxide solution. Swirl gently to mix.
- Vacuum filter the contents of the beaker through glass fiber filter. Wash the filter funnel and beaker down with pH 12.9 barium hydroxide solution. Filter all washings. Continue to wash the glass filter with pH 12.9 barium hydroxide solution until the filtrate leaving the bottom of the filter stem is clear. Label the filtrate in the suction flask as Sample A.
- Place the filter disc into a 250 ml Erlenmeyer flask and label it as Sample B.
- Add 20 ml of 20% by volume Nitric solution to both Sample A and B. Swirl gently to mix.
- Add 20 ml of 10% by weight Potassium Iodide solution to both Sample A and B. Swirl gently to mix.
- Titrate Sample A and B with 0.10N Sodium Thiosulfate solution to a straw yellow color. At this point add 5ml of a 2% starch solution to both samples. Swirl to mix. Continue titrating with 0.10N Sodium Thiosulfate solution to a colorless endpoint.
- Record the number of mls of 0.10N sodium thiosulfate used for each sample.
g/l MAR MN-63A = ml 0.10N sodium thiosulfate x 15.8 (sample A)
g/l by-product = ml 0.10N sodium thiosulfate x 24.6 (sample B)
Maintain the MAR MN-63A concentration as specified in the operating parameters of the data sheet. Maintain the by-product at < 20g/l.
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