PCB Manufacturing Chemical Laboratory

Our laboratory’s responsibility is to ensure that all the materials used in our production lines are reliable in composition and to ensure continuous and streamline production.

The production process of printed circuit boards involves many chemical reactions, therefore the regular chemical analysis on the substances come out during the PCB production process helps to prevent and detect abnormalities in production, facilitating streamlined production.

All the circuit boards produced by WELLER will withstand the rigorous quality and reliability test. And it is our regular quality policy of production that to perform a comprehensive first article inspection process and assures that the products we produced meet customers specification.

PCB Manufacturing Chemcial Laborotary Test Items

PCB Manufacturing Chemcial Laborotary Test Items
Procedures Cylinder Analysis Item Instruments Chemical reagents Method & Criteria
Electroless Copper Plating Bulking Agent Alkalinity Pipette, automatic titration bottle, conical bottle Mixed indicator, 0.2 mol/L HCL standard solution
211 stress Measuring cylinder, electronic balance, glass rod Solid NaOH (AR grade)
Desmear Mn7+ Mn6+ Pipette, automatic titration bottle, conical flask, volumetric flask 15% Ba (OH) 2, 25% H2SO4, KI solid, starch indicator0.2 mol/L Na2S2O3 standard solution
Alkalinity Pipette, automatic titration bottle, beaker, pH meter, stirrer 0.2 mol/L HCL standard solution
Neutralization acidity Pipette, automatic titration bottle, conical bottle Phenolphthalein indicator, 1.0 mol/L NaOH standard solution
216 Pipette, automatic titration bottle, conical bottle, electric furnace, measuring cylinde 15% ammonium ferric sulfate, 10% H3PO4, ferrocene indicator, 0.1 mol/L ammonium cerium sulfate
Degreasing 233 Pipette, automatic titration bottle, conical bottle Toluidine blue, 0.0005N PVSK, pH=2 buffer solution
Microetching SPS Pipette, automatic titration bottle, conical bottle 25% H2SO4, KI solid, 0.5% starch indicator, 0.2 mol/L Na2S2O3 standard solution
H2SO4 Pipette, automatic titration bottle, conical bottle Methyl orange, 1.0mol/L NaOH standard solution
Cu2+ Pipette, automatic titration bottle, conical bottle, measuring cylinder PH=9.5 ammonium buffer solution, 0.2 mol/L EDTA standard solution, 0.1% PAN indicator
Acid cleaning H2SO4 Pipette, automatic titration bottle, conical bottle Methyl orange, 1.0mol/L NaOH standard solution
Preliminary-immerged S.G 1.1-1.2 Pyknometers, measuring cylinders /
Activate stannous chloride(SnCl2) Pipette, automatic titration bottle, conical bottle, measuring cylinder 25% HCL, starch indicator, 0.1 mol/L I2 standard solution
Spectrophotometer, measuring cylinder, pipette, volumetric flask /
1.1-1.2 Pyknometers, measuring cylinders /
Electroless Copper Plating Electroless Copper Plating Cu2+ Pipette, automatic titration bottle, conical bottle, measuring cylinder 25% H2SO4, KI solid, KSCN, 0.2 mol/l Na2S2O3 standard solution, starch indicator
Pipette, automatic titration bottle, conical flask, measuring cylinder, pH meter, stirrer 0.2 mol/l HCL Standard solution、1mol/LNa2SO3
Electroless Copper Plating EDTA Pipette, automatic titration bottle, conical bottle PH=10 buffer solution, PAN indicator, 0.016mol/L CuSO4 standard solution
Electronic balance, oven /
Electroplating Degreasing LP-200 Pipette, automatic titration bottle, conical bottle Methyl orange, 1.0 mol/L NaOH standard solution
Microetching SPS、H2SO4、Cu2+ Analysis method Same as microetching in the electroless Copper Plating
Electroplating Copper cylinder CuSO4˙5H2O Pipette, automatic titration bottle, conical bottle PH=9.5 buffer, PAN, 0.2 mol/L EDTA standard solution
H2SO4 Pipette, automatic titration bottle, conical bottle Methyl orange, 1.0 mol/L NaOH standard solution
Cl- Pipette, automatic titration bottle, conical bottle, measuring cylinder 1:1 HNO3、 0.1 mol/L AgNO3、0.01 mol/L Hg(NO3)2 standard solution
Tin cylinder SnSO4 Pipette, automatic titration bottle, conical bottle, measuring cylinder 25% H2SO4, starch indicator, 0.1 mol/L I2 standard solution
H2SO4 Pipette, automatic titration bottle, conical bottle, measuring cylinder 4% ammonium oxalate, methyl red, 1.0 mol/L NaOH standard solution
Tin strippingcylinder HNO3 Pipette, automatic titration bottle, conical bottle Phenolphthalein indicator, 1mol/L NaOH
Alkaline etching Bulking film removing JK-604 Pipette, automatic titration bottle, conical bottle Mixed indicator, 0.2 mol/L HCL standard solution
Palladium stripping Acid equivalent Pipette, automatic titration bottle, conical bottle Methyl orange indicator, 1.0mol/L NaOH standard solution
Tin stripping HNO3 1.2-1.3 Pyknometers, measuring cylinders /
Etching cylinder Electroless Copper Plating Pipette, automatic titration bottle, conical bottle PAN indicator, 0.2mol/L EDTA standard solution
Cl- Pipette, automatic titration bottle, conical flask, volumetric flask Acetic acid, 4% K2CrO4, 0.1 mol/L AgNO3 standard solution
PH value PH meter PH=9.18 standard solution
Proportion 1.1-1.2 Pyknometers, measuring cylinders /
Outlayer acid etching Etching cylinder Cu2+ Pipette, automatic titration bottle, conical flask, volumetric flask Ammonia, potassium iodide, 1% starch indicator, 0.2mol/l sodium thiosulfate, glacial acetic acid
HCl Pipette, automatic titration bottle, beaker, pH meter PH=6.86 buffer solution pH=4.0 buffer solution 1.0mol/L sodium hydroxide standard solution
Acid dip H2SO4 Pipette, automatic titration bottle, conical bottle Methyl orange indicator, 1.0mol/L NaOH standard solution
film stripping NaOH Pipette, automatic titration bottle, conical bottle Phenolphthalein indicator, 0.2 mol/L HCL standard solution
Dry film pre-treatment Acid dip H2SO4 Same as the Analytical methods H2SO4 in Microetching of PTH
Dry fim Developing / K2CO3 Pipette, automatic titration bottle, conical bottle Methyl orange indicator, 0.2 mol/L HCL standard solution
PH计 PH meter PH=9.18 standard solution
Soldermask Scrubbing Acid dip 1、2 H2SO4 Same as the Analytical methods H2SO4 in Microetching of PTH
Cinerite Concentration 100ml measuring cylinder /
Soldermask Supper Roughening Acid dip H2SO4 Same as the Analytical methods H2SO4 in Microetching of PTH
Supper Roughening CU2+ Same as the Analytical methods CU2+ in Microetching of PTH
Hydrochloric acid HCL Pipette, automatic titration bottle, conical bottle Bromocresol green methyl red indicator, 1.0mol/L NaOH solution
CU2+ Same as the Analytical methods CU2+ in Microetching of PTH
Soldermask development / K2CO3 Pipette, automatic titration bottle, conical bottle Methyl orange indicator, 0.2 mol/L HCL standard solution
PH PH=9.18 standard solution
HASL leadfree Acid dip H2SO4 Same as analytical methods ofacid dip in Dry film pre-treatment process
Microetching SPS、H2SO4、Cu2+ Same as the analytical methods of microetching in PTH
Flux Proportion 1.0-1.2 Pycnometer, graduated cylinder /
Brown oxidation Alkaline dip 231C Pipette, automatic titration bottle, conical bottle 0.2 mol/L HCI standard solution, phenolphthalein indicator
Acid dip SPS、H2SO4、Cu2+ Same as the analytical methods of microetching in PTH
Pre-dip 232C Spectrophotometer, volumetric flask, pipette, 1cm quartz glass colorimetric dish /
PH value PH meter PH=9.18 standard solution
Brown oxidation H2O2 Pipette, automatic titration bottle, conical bottle, measuring cylinder Test ferrous Ling, 0.1mol/L cerium ammonium sulfate standard solution
H2SO4 Pipette, automatic titration bottle, conical bottle 1mol/lNaOH, methyl orange reagent
230C Spectrophotometer, volumetric flask, pipette, 1cm quartz glass colorimetric dish
Cu2+ Pipette, automatic titration bottle, conical bottle PH=9.5 buffer, PAN, 0.2 mol/L EDTA standard solution
Inner pre-treatment line Degreasing 105C Pipette, automatic titration bottle, conical bottle 0.1N NaOH standard solution, methyl orange indicator
Microetching SkyEco 190% Spectrophotometer, volumetric flask, pipette, 1cm quartz glass colorimetric dish
Cu2+ Pipette, automatic titration bottle, conical bottle PH=9.5 buffer, PAN, 0.2 mol/L EDTA standard solution
H2SO4 Pipette, automatic titration bottle, conical bottle 1mol/lNaOH, methyl orange reagent
Microetching rate / /
Acid dip H2SO4 / /
Immersion gold line Degreasing FS-10 Pipette, automatic titration bottle, conical bottle 1.0mol/l sodium hydroxide solution, 0.1% PP indicator
Microetching SPS Same as the analytical methods of microetching in PTH
Cu2+
H2SO4
Microetching rate
Pre-dip H2SO4 Same as the analytical methods of acid dip in PTH microetching
Activate Pd2+ AA machine, measuring cylinder, pipette, volumetric flask /
Cu2+ AA machine, measuring cylinder, pipette, volumetric flask /
PH pH meter PH=6.86 and pH=9.18 standard solution
Post-dip treatment H2SO4 Same as the analytical methods of acid dip in PTH microetching
Nickel bath Ni2+ Pipette, automatic titration bottle, conical bottle 2N ammonia aqueous solution (150ml/l), 1% cyanuric acid amine indicator, 0.2mol/l EDTA standard solution
NaH2PO2 AA machine, measuring cylinder, pipette, volumetric flask 6mol/l hydrochloric acid, 0.1mol/l iodine standard solution, 0.2mol/l sodium thiosulfate standard solution, 0.1% starch indicator
PH pH meter PH=6.86 and pH=9.18 standard solution
Immersion gold line Gold tank Au AA machine, measuring cylinder, pipette, volumetric flask /
PH pH meter PH=6.86 and pH=9.18 standard solution
Cu2+ AA machine, measuring cylinder, pipette, volumetric flask /
Ni2+ AA machine, measuring cylinder, pipette, volumetric flask /
FS-60 Pipette, automatic titration bottle, conical bottle   NiSO4 0.01mol/l, EDTA 0.01mol/l, 28% ammonia water, 1% purple urea amine indicator
Immersion Tin Line Degreasing 906C Pipette, automatic titration bottle, conical bottle 0.1% PP indicator, 0.2mol/l hydrochloric acid solution
Microetching SPS Same as the analytical methods of PTH microetching
Cu2+
H2SO4
Activate Citric acid Pipette, automatic titration bottle, conical bottle Methyl orange indicator, 1.0mol/l sodium hydroxide solution
Pre-dip Tin ion Pipette, automatic titration bottle, conical bottle Thiourea (75g/l), PH4.7 buffer, methylthymol blue, 0.2M EDTA
Thiourea Spectrophotometer, volumetric flask, pipette, 1cm quartz glass colorimetric dish /
Titratable acid Pipette, automatic titration bottle, conical bottle      M-cresol violet indicator, 1.0N sodium hydroxide
Immersion Tin Line Chemical tin Tin ion Same as the analytical methods of pre-dip
Thiourea
Titratable acid
Immersion Tin Line Post-dip treatment Tin ion Same as the analytical methods of pre-dip
Thiourea
Titratable acid
Thiourea cleaning Thiourea Spectrophotometer, volumetric flask, pipette, 1cm quartz glass colorimetric dish /
H2SO4 Pipette, automatic titration bottle, conical bottle Methyl orange, 1.0mol/L NaOH standard solution
Ionic strippling clean 985C Pipette, automatic titration bottle, conical bottle Phenolphthalein indicator, 0.2N hydrochloric acid
Anti-oxidation 959C Pipette, automatic titration bottle, conical bottle Methyl orange indicator, 0.1 sodium hydroxide
Electroplated nickel gold Electroplated nickel gold SPS Same as the analytical methods of PTH
Cu2+
H2SO4
Activate 1 H2SO4 Pipette, automatic titration bottle, conical bottle Methyl orange reagent, 1mol/lNaOH
Nickel plating bath NiCL2 Pipette, automatic titration bottle, conical bottle Potassium chromate, 0.1N silver nitrate
NiCL3 Pipette, automatic titration bottle, conical bottle Potassium chromate, 0.2N silver nitrate
NI2+ Pipette, automatic titration bottle, conical bottle Ammonia water, uric acid amine, 0.2M EDTA
Cu2+ AA machine, measuring cylinder, pipette, volumetric flask /
Proportion Hydrometer /
PH PH meter /
Activate 2 Citric acid AA machine, measuring cylinder, pipette, volumetric flask Methyl orange indicator, 1.0mol/l sodium hydroxide solution
Gold plating Au AA machine, measuring cylinder, pipette, volumetric flask /
Cu2+ AA machine, measuring cylinder, pipette, volumetric flask /
Ni2+ AA machine, measuring cylinder, pipette, volumetric flask /
PH PH meter /
Pb AA machine, measuring cylinder, pipette, volumetric flask /
Proportion Density hydrometer /
Recycling cylinder Au AA machine, measuring cylinder, pipette, volumetric flask /
Gold cylinder exhaust port Au AA machine, measuring cylinder, pipette, volumetric flask /
Platinum Gold plating Acid dip H2SO4 Pipette, automatic titration bottle, conical bottle Methyl red, 1.0mol/L NaOH standard solution
Platinum Gold Tank Pt AA machine, measuring cylinder, pipette, volumetric flask /
H2SO4 Pipette, automatic titration bottle, conical bottle Methyl red, 1.0mol/L NaOH standard solution

Each PCS of printed circuit board you ordered from Weller would be rigorously manufactured through our standard production process to ensure the best performance and reliability.

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