# Calculating the Lead (Pb) ppm from the Plating Layer

C

#### cs168

Hi,
We do tested on a plated sample and the Pb result is 110ppm(mg/kg), it is a destructive test conducted by a lab. My question is can we calculate the Pb ppm if we assume that all are coming from the plating?

total weight of the sample is 48.84mg
the weight for plating is = 2.36mg
the weight for metal is = 36.48mg

total sample use for testing is @4000mg

thanks

#### Jim Wynne

Re: Can we calculate the Lead (Pb) ppm from the Plating Layer

What other consituents are there in the plating? Is this a tin/lead deposition, or something similar? If that's the case, just knowing the weight of the plating and the "tare" weight (the pre-plate weight of the substrate) isn't enough. What's the tolerance on the amount of lead present? How do you account for contaminants/inclusions?

A

#### achorste

Re: Can we calculate the Lead (Pb) ppm from the Plating Layer

We recently purchased an XRF 'gun' from Niton - it does analysis of metal composition, one of the limitation it has is that it only analyses the surface of the metal - this may be ideal for your needs.

Something to consider maybe.

(note - I have no connection with Niton )

C

#### cs168

Re: Can we calculate the Lead (Pb) ppm from the Plating Layer

What other consituents are there in the plating? Is this a tin/lead deposition, or something similar? If that's the case, just knowing the weight of the plating and the "tare" weight (the pre-plate weight of the substrate) isn't enough. What's the tolerance on the amount of lead present? How do you account for contaminants/inclusions?
This is a pure tin plating. We just want to find out the Pb content at the plating. Either it is due to contamination or what ever, as of now we are unable to know the Pb content at the plating.

thanks

#### Dr. L. Ramakrishnan

Moderator
Re: Can we calculate the Lead (Pb) ppm from the Plating Layer

HI

Even though I don't understand the numbers that you have quoted, I thought I would answer your question whether you can express the lead concentration in terms of the plating layer; in my opinion you can do it only if you are sure (with evidence) that the base material does not contain lead.

Since you have referred to destructive analysis, I presume that the total product was dissolved in an acid mixture and tested for Lead (e.g. by atomic absorption spectrometry or Electronic absorption spectrometry after colour formation). In this case you will not be able to determine if the lead was present in the plating or the component that had been plated. In many cases where free-cutting brass is plated with solder or tin, the lead content of the brass can show up in the analysis. Normally the free-cutting brass has a lead content of about 2.0 to 3.5 % and this will show up in the analysis if the whole product is dissolved and tested for lead.

With best wishes,

Ramakrishnan

Last edited:
E

#### Eusoof

Re: Can we calculate the Lead (Pb) ppm from the Plating Layer

From my understanding, it's more easy for you to test the chemical of plating instead of finish goods because from the chemical we can detect if have element of Pb. However if the test for finish goods the potential that will contaminate with the base material. Please note that have homogenous material (cannot separate by mechanical method) and heterogeneous (can separate by mechanical method).

B

#### Balu Sharma

Re: Can we calculate the Lead (Pb) ppm from the Plating Layer

The only way to be truely sure is to test a sample of the plating material separately.

Calculating Risk Estimation ISO 14971 - Medical Device Risk Management 28
Calculating Ppk for Design Verification - Variable Sampling Design and Development of Products and Processes 15
Help needed in choosing the method of calculating the minimum sample size Internal Auditing 12
True position, calculating theoretical distances General Measurement Device and Calibration Topics 0
Lean: Conducting Capacity Study, calculating Cycle times on laser cutting machines Lean in Manufacturing and Service Industries 2
Calculating Carbon Footprint in the Organization Miscellaneous Environmental Standards and EMS Related Discussions 2
Calculating your KPIs ISO 13485:2016 - Medical Device Quality Management Systems 7
Calculating Heat Dissipation Manufacturing and Related Processes 1
Calculating Defect Rates ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 4
Formula for Calculating NoGo Major Diameter for UN gages Inspection, Prints (Drawings), Testing, Sampling and Related Topics 4
Calculating a weight for a machine for the CE label CE Marking (Conformité Européene) / CB Scheme 0
Remote Support - Calculating Number of Employees IATF 16949 - Automotive Quality Systems Standard 2
Calculating Tolerance of a Panel Meter with a 2 degrees of an Arc General Measurement Device and Calibration Topics 0
Calculating LCL, UCL, Cp, and Cpk in an Excel Spreadsheet Statistical Analysis Tools, Techniques and SPC 3
Product Development - When to start calculating Process Capability Capability, Accuracy and Stability - Processes, Machines, etc. 3
Calculating Reliability for Subsystems in Series Reliability Analysis - Predictions, Testing and Standards 15
Calculating (3rd Party) Audit Days for Company with Seasonal Employees General Auditing Discussions 3
T Formulas for Calculating Coefficients for RTD / PRTD Calibration According to ITS-90 General Measurement Device and Calibration Topics 5
J Calculating part variation from historic data for GRR study Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
P Purpose of calculating Ta, Tb & R Square in Linearity Study Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 1
P Purpose of calculating Uncertainty value in calibration study Measurement Uncertainty (MU) 5
M Calculating MTBF for plug-in PCI cards Reliability Analysis - Predictions, Testing and Standards 2
J Calculating impact force, expressed in lbs, of a 5 lb weight dropped 48 inches Inspection, Prints (Drawings), Testing, Sampling and Related Topics 1
M Calculating Cpk when sample size equals to 1 Capability, Accuracy and Stability - Processes, Machines, etc. 12
D Calculating Cpk on Non-Normal Data Distribution Capability, Accuracy and Stability - Processes, Machines, etc. 10
K Calculating Capability of a process when data is skewed in the upper range Capability, Accuracy and Stability - Processes, Machines, etc. 4
A Calculating Accuracy for a Multimeter General Measurement Device and Calibration Topics 1
M Calculating Coefficients for an RTD (Resistance Temperature Detector) Probe General Measurement Device and Calibration Topics 3
T Calculating Plating/Coating Weight for IMDS RoHS, REACH, ELV, IMDS and Restricted Substances 3
D Calculating Lower and Upper 3 Sigma Control Limits Statistical Analysis Tools, Techniques and SPC 2
M Calculating Adequate Receiving Inspection Sample Size Statistical Analysis Tools, Techniques and SPC 2
M Calculating Capability of Delivery Performance Capability, Accuracy and Stability - Processes, Machines, etc. 5
K Advice on Calculating Control Chart Control Limits Statistical Analysis Tools, Techniques and SPC 13
B Calculating Combined DPMO and Sigma Level for Two or More Different Work Areas Six Sigma 3
G Calculating the Fraction Defective Confidence Interval for a Lot Statistical Analysis Tools, Techniques and SPC 2
A Calculating Combined Measurement Uncertainty - VDA 5 Measurement Uncertainty (MU) 1
B Calculating Precision to Tolerance Ratio Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 9
D DPPM - Calculating the Defect Rate of a Software Test Statistical Analysis Tools, Techniques and SPC 9
L FMEA - Calculating RPN = S*O*D FMEA and Control Plans 3
I Shewhart Constants vs Central Limit Theorem in calculating Control Limits Statistical Analysis Tools, Techniques and SPC 18
B Please share a template for calculating Cp Cpk Document Control Systems, Procedures, Forms and Templates 3
S Is a Stable Process (within Control Limits) required for Calculating Pp, Ppk? Capability, Accuracy and Stability - Processes, Machines, etc. 6
Calculating the IATF TS 16949 Recertification Audit Man Days - Clarification ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 6
IEC60825 - Laser Safety - Calculating Maximum Permissible Exposure Correctly Other ISO and International Standards and European Regulations 1
P Calculating Process Capability from Data of attached spreadsheet Statistical Analysis Tools, Techniques and SPC 4
I AQL Formula in Excel - Calculating Sample Size based on an AQL Chart AQL - Acceptable Quality Level 8
D Formula for Calculating Warp Measurement of Corrugated Boxes General Measurement Device and Calibration Topics 1
S Need Help Calculating and Implementing Cs - Wright's Index Statistical Analysis Tools, Techniques and SPC 11
S Calculating an Uncertainty Budget for an Optical Comparator General Measurement Device and Calibration Topics 4
D One-Two-Three Sigma Control Limits - Calculating Control Limits for X-bar Charts Statistical Analysis Tools, Techniques and SPC 3