Contents
Complements workflow

IPC J-STD-003: solderability tests for printed boards in electronics manufacturing, and the room temperature checks before them

IPC J-STD-003 tests whether printed board pads, conductors and plated through holes wet with molten solder, using edge dip (dip and look), wave, surface mount simulation, solder float and wetting balance tests. The Dropometer does not measure solder wetting: it works at 10 to 45 °C and cannot test molten solder. It complements the workflow with room temperature checks before soldering: the surface tension of the test flux by pendant drop, and the water contact angle of the board finish on a sibling coupon, to catch a changed flux or a contaminated finish before you spend a coupon on the solder test.

What brings you here?

Who this is for
Printed board fabricators, electronics assemblers, solderability test labs and suppliers of board finishes and flux.
Compliance tier
Complements workflow: the Dropometer does not measure solder wetting. It adds flux surface tension and finish water contact angle checks at room temperature, before the J-STD-003 test.
Measurement
Pendant drop surface tension up to 75 mN/m, ±0.03 mN/m accuracy; sessile drop contact angle 10° to 175°, ±0.35° accuracy (Dropometer datasheet).
Setup
About 2 minutes. Battery powered, 1 kg, runs on the QA bench next to the solderability lab.
Last updated
October 20, 2026
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Free one page checklist for the room temperature checks that sit next to IPC J-STD-003: flux surface tension, finish contact angle, the settings to lock and what to record. Made for board QA and solderability labs.

Talk to an expert

Book a 15 minute demo on your flux and finish

Tell us your board finish, your test flux and how you run solderability tests today. We will run the flux and finish checks live and tell you plainly where the Dropometer fits next to your solder test and where it does not.

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View the official standard
Gurdeep-Saini-Photo
Written by
Gurdeep Singh Saini
Holds a BASc in Mechanical Engineering from Ryerson University (now Toronto Metropolitan University) and an MASc from York University. He develops the automatic edge and baseline detection behind the Dropometer's analysis.
COO at Droplet Lab
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Droplet-Lab logo
Technical Review by
Droplet Lab Team
Droplet Lab builds precision instruments and software for surface science measurement, specialising in contact angle analysis and surface tension characterisation. Used by researchers across materials science, pharmaceuticals, coatings, and advanced manufacturing, Droplet Lab's Dropometer has contributed to studies published in peer-reviewed journals including Advanced Functional Materials (Impact Factor 19). The team combines instrument engineering with deep domain knowledge in wettability science with a focus on practical accuracy.
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Verified against IPC J-STD-003
Gurdeep-Saini-Photo
Written By

Gurdeep Singh Saini

COO at Droplet Lab

Holds a BASc in Mechanical Engineering from Ryerson University (now Toronto Metropolitan University) and an MASc from York University. He develops the automatic edge and baseline detection behind the Dropometer's analysis.

Droplet-Lab logo
Reviewed By

Droplet Lab Team

Droplet Lab builds precision instruments and software for surface science measurement, specialising in contact angle analysis and surface tension characterisation. Used by researchers across materials science, pharmaceuticals, coatings, and advanced manufacturing, Droplet Lab's Dropometer has contributed to studies published in peer-reviewed journals including Advanced Functional Materials (Impact Factor 19). The team combines instrument engineering with deep domain knowledge in wettability science with a focus on practical accuracy.

Featured Studies & Publications

Research Paper Contact angle measurement with a smartphone
Research Paper Surface tension measurement with a smartphone using a pendant drop

Evidence box: the industry standard for solderability and the Dropometer

Standard

IPC J-STD-003D, Solderability Tests for Printed Boards, October 2022, which supersedes J-STD-003C with Amendments 1 and 2. It covers edge dip, wave solder, surface mount simulation and solder float tests with visual criteria, and a wetting balance test with force criteria. A board maker's guide gives the bath as 235 °C for tin lead solder and 255 °C for SAC305 (source: JLCPCB solderability testing guide); use the values in your edition.

Compliance tier

Complements workflow. The Dropometer measures none of the quantities J-STD-003 reports: solder coverage, hole fill or wetting force. It works at 10 to 45 °C and cannot test molten solder. It adds flux surface tension and finish water contact angle checks before the test.

Instrument performance

Pendant drop surface tension up to 75 mN/m, accuracy ±0.03 mN/m, resolution 0.01 mN/m. Contact angle 10° to 175°, accuracy ±0.35°. Both from the Dropometer product specification.

Peer reviewed method

The drop shape method is validated against a KRUSS DSA100E in two peer reviewed papers. See our validation publications.

Customer evidence

A plating chemistry maker uses the Dropometer for contact angle and surface tension work. Read the case study. We have no published client study run alongside IPC J-STD-003.

What it does not tell you

A flux surface tension or a finish contact angle does not show whether solder will wet the pad or fill the hole. Only the J-STD-003 test does. Any link between the two comes from your own correlation study.

Executive summary: IPC J-STD-003 solderability test methods

What this standard measures, who uses it and how the Dropometer fits

IPC J-STD-003 sets the solderability tests for printed boards: it checks that board fabrication and storage have not harmed the ability of attachment lands, surface conductors and plated through holes to wet with molten solder. Good solderability is the base of reliable solder joints. Board fabricators, assemblers and surface finish suppliers use it to accept boards before assembly. The Dropometer complements this workflow. It does not measure solder wetting, because the tests run in molten solder far above its 10 to 45 °C operating range. It adds room temperature checks before soldering: flux surface tension by pendant drop and board finish water contact angle.

The current revision, J-STD-003D (October 2022), groups its tests in two families. Edge dip, wave solder, surface mount simulation and solder float tests are judged by eye against accept criteria for coverage, non wetting and dewetting, with defect definitions and illustrations for assessing each result, so many people call them dip and look tests. The wetting balance test records the wetting force on the specimen over time. All of them use an activated rosin test flux and a molten solder bath at the temperature the standard specifies. The Dropometer runs none of these tests.

What it adds comes before the solder bath. Solder only wets a pad the flux has already wet, and good spreading needs a clean surface. The Dropometer pendant drop tensiometer reads the surface tension of the test flux up to 75 mN/m with ±0.03 mN/m accuracy, so you can see when a flux lot or an open flux pot has drifted. On a sibling coupon from the same panel, a water contact angle shows whether the finish has picked up handling residue or organic film since your reference board. The PCB surface prep use case covers the same contact angle check for solder mask, conformal coating and cleanliness. A plating chemistry maker uses the Dropometer for contact angle and surface tension work. For background, read the telecommunications guide and the surface tension measurement guide.

Further reading: reproducible surface tension measurement, surface tension of common liquids, including isopropyl alcohol, choosing a tensiometer for production QC and the coffee ring effect, which explains why drying drops leave residue rings on a surface.

How the Dropometer fits before the solderability test

Room temperature flux and finish checks before an IPC J-STD-003 test, step by step

From a test flux and a sibling coupon to a go or hold decision

These steps describe checks on the Dropometer that sit before an IPC J-STD-003 test. They are not part of the standard and do not replace any of its solder tests. Buy the current edition and follow it for every solderability result you report.

±0.03 mN/m

Flux surface tension accuracy

From the Dropometer product specification. Range up to 75 mN/m, resolution 0.01 mN/m.

±0.35°

Finish contact angle accuracy

From the Dropometer product specification. Range 10° to 175°.

10 to 45 °C

Operating range

Room temperature checks only. The Dropometer does not measure molten solder or run a wetting balance.

1

Plan the checks around the solder test

Pick a sibling coupon or a spare area from the same panel for the contact angle check. Keep water off the specimen you will solder test, because a drying drop can leave residue, as the coffee ring effect shows. Handle coupons by the edges and note the finish, lot and storage time.

2

Set up and check with water

Level the base plate, mount the phone and LED, and fit a clean needle. Hang a drop of pure water and read its surface tension. Compare it with the reference value for your room temperature before you test any flux.

3

Read the test flux surface tension

Rinse the needle with solvent, then hang a pendant drop of the activated rosin test flux and enter its density. The solvent evaporates, so read every drop at the same short drop age. Compare the mean with your reference for a fresh, approved lot. See reproducible surface tension measurement for bench practice.

4

Read the finish water contact angle

Lay the sibling coupon flat on the sessile stage. Place deionised water drops of a fixed volume on a flat finished area larger than the drop, at the same positions each time. Automatic edge and baseline detection gives the same reading from the same image.

5

Compare with your bands

Compare the flux and finish means with the bands from your correlation study. A finish angle above its band points to handling residue, organic film or an ageing finish. Hold the panel, clean or investigate, then decide whether to test it.

6

Run the J-STD-003 test and log both

Send the specimen to the edge dip, wave, surface mount simulation, float or wetting balance test your customer names, run as the standard specifies. Log the flux and finish readings next to each solder result. Over time, that log is the correlation study that sets your bands.

7

Watch the full measurement

This video shows a complete Dropometer pendant drop surface tension measurement, from setup to result. It covers the steps above in one run.

Dropometer pendant drop surface tension, start to finish.

Validated measurement approach

Independent benchmarking and publication-based validation references.

Peer reviewed method

The Dropometer drop shape method is validated against a KRUSS DSA100E in two peer reviewed papers, one in Review of Scientific Instruments and one in Colloids and Surfaces A. Published accuracy is ±0.03 mN/m for surface tension and ±0.35° for contact angle (Dropometer product specification).

Read the validation papers

Customer evidence

A plating chemistry maker uses the Dropometer for contact angle and surface tension work. We have no published client study run alongside IPC J-STD-003, and no published data linking these checks to J-STD-003 results.

Read the case study

Set your bands from your own PCBs and flux

IPC J-STD-003 · flux and finish checks · board QA

IPC J-STD-003 sets accept criteria for its own solder tests: visual coverage for the edge dip, wave, surface mount simulation and float tests, and force criteria for the wetting balance. It publishes no water contact angle or flux surface tension limit. So any band you use on the Dropometer comes from your own correlation study.

Check the pendant drop setup with pure water before each session. The reference value is 72.74 mN/m at 20 °C and 71.97 mN/m at 25 °C (source: IAPWS R1-76(2014)). Then record the surface tension of a fresh, approved lot of test flux at the same drop age as your reference. Keep the flux maintenance checks the standard specifies; surface tension is an extra trend, not a substitute.

For the finish, measure the water contact angle on sibling coupons from panels that passed and panels that failed the J-STD-003 test you use. Set your hold band from that data, for each finish and supplier. Repeat the study when you change finish chemistry, storage, packaging or the test flux. Without that data, a contact angle shift tells you the surface changed, not that the board will fail.

Example output

Example data for illustration only. These are not measured results. Your own finish, storage and correlation data decide the numbers.

Example: water contact angle on ENIG sibling coupons from four panels, before J-STD-003 testing

Coupon Drops (n) Mean angle (°) Std dev (°) Change vs reference (°) Next step
Reference panel (passed J-STD-003)568.41.20.0Reference
Panel B570.11.5+1.7Inside example band: run the solder test
Panel C572.81.8+4.4Near band edge: run the solder test, note the reading
Panel D582.62.1+14.2Above example band: hold, check handling and storage first

How to read this table

Each row is the mean of five drops of deionised water on a sibling coupon, read at the same time after placement. The example hold band is the reference reading plus 5°, set from a correlation study against past J-STD-003 results. The Dropometer readings decide which panels to clean or investigate first; the solder test still decides solderability.

Example output chart

The same example data as the table, with the reference reading and the example hold band marked.

Bar chart of example water contact angles on four ENIG sibling coupons, with three panels near the 68.4 degree reference and one panel at 82.6 degrees above an example hold band of 73.4 degrees

Example data, not measured results.

Business impact

What changes when flux and finish checks sit before your solder test

Metric Before Dropometer With Dropometer Results
When a finish problem shows up At the solder test, after the coupon is used Before the test, from a water contact angle on a sibling coupon No published benchmark
Test flux consistency Flux maintenance checks as the standard specifies Plus a surface tension value per lot, ±0.03 mN/m accuracy Dropometer product specification
Solderability result J-STD-003 edge dip, wave, surface mount simulation, float or wetting balance Unchanged: still the J-STD-003 test IPC J-STD-003D scope
Record Pass or fail, or a wetting curve Plus drop images and readings logged against each panel No published benchmark

See the checks on your own flux and boards

Bring a test flux lot and coupons from a panel that passed and one that failed. We will measure both live at room temperature.

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ROI estimate

Estimate the cost of the solderability failures found too late

Enter your own numbers. The defaults are examples, not Droplet Lab results.

Quality cost snapshot

Estimate what wetting related failures cost you.

Example only. Use what you see in a trial on your own samples.
Your own figure.
Your own estimate.

Result

~0
Estimated annual cost today
~0
Estimated annual cost avoided
~0
Payback period

Annual exposure combines audit/CAPA cost, customer rejections, and recall probability; avoided exposure applies the risk reduction percentage.

Method settings

Lock these before you compare flux and finish readings between lots, shifts or sites

Parameter Recommended Setting Technical Rationale
Role of the check Before the J-STD-003 test, never in place of it The Dropometer works at 10 to 45 °C and does not measure solder wetting.
Contact angle specimen Sibling coupon or spare area from the same panel Water left on the solder test specimen could change its result.
Contact angle liquid Deionised water, fixed drop volume A changing volume or water quality adds spread that is not about the finish.
Reading time Fixed for every drop Drops can spread or evaporate on the finish, so the time must not vary.
Positions The same mapped flat areas on every coupon Finish and residue vary across a panel; the drop needs a flat area larger than itself.
Flux reading Pendant drop, density entered, fixed short drop age The Young-Laplace fit needs density, and the solvent evaporates as the drop hangs.
Fit model Young-Laplace for pendant drop; Young-Laplace or polynomial for contact angle, the same every run Both models are in the Dropometer software. Do not mix them within one study.
Environment Record room temperature and humidity The Dropometer has no temperature control. Flux surface tension shifts with temperature.

Is IPC J-STD-003 or J-STD-002 the right test?

Pick the method by the question you need answered

Start: What do you need to know about the board or the flux?

Will the pads and holes take solder?

Signals:

You need to accept printed boards for solderability before assembly.

Rule-out:

Use IPC J-STD-003, this page, in a solderability lab with a solder bath or wetting balance. The Dropometer does not run these tests.

Component leads, not boards

Signals:

You need the solderability of component leads, terminations or wires.

Rule-out:

Use J-STD-002, the matching IPC and JEDEC standard for components. The Dropometer does not run it either.

Has the finish changed since the reference?

Signals:

You want to catch handling residue, organic film or ageing on the finish before a solder test.

Rule-out:

Use a water contact angle on a sibling coupon with the Dropometer, and set bands from your own correlation. For coating and cleanliness checks on boards, see the IPC TM-650 page.

Is the test flux the same lot to lot?

Signals:

You want a number to trend for each test flux lot or open flux pot.

Rule-out:

Use pendant drop surface tension on the Dropometer, next to the flux maintenance the standard specifies.

Decision tree at a glance

Start from the question you need answered. Blue boxes are measurements the Dropometer runs. The solder tests themselves are not.

Decision tree showing that solder wetting of boards and components needs IPC J-STD-003 or J-STD-002 solder tests, while finish change and test flux consistency can be checked on the Dropometer at room temperature

Is IPC J-STD-003 the right test?

Interpreting surface changes that can affect solderability

What flux and finish readings tell you, and what they do not

A higher finish angle flags a changed surface: Residue, organic film or ageing usually raise the water angle. Compare with your reference on the same finish.
A flux shift flags a changed flux: A surface tension change from your reference lot points to solvent loss, contamination or a different lot.
Readings point, the solder test decides: An in band reading does not prove solderability. Only the J-STD-003 test does.
Compare like with like: Bands hold for one finish, one supplier and one flux. Do not compare an ENIG angle with an OSP or HASL angle.
Expert perspective

Why solder wetting starts with a clean, well fluxed surface

Plot surface tension against surfactant concentration and the interface tells you when it is saturated: the curve bends at the point where the surface can hold no more.

Dr. Alidad Amirfazli

Department of Mechanical Engineering, York University, Co-founder and Scientific Advisor, Droplet Lab

Common pitfalls and limits of these checks

Honest limits of the checks and of the Dropometer

The Dropometer works at 10 to 45 °C and cannot measure molten solder, wetting force or hole fill. It complements the J-STD-003 test and never replaces it.
Water on the specimen you will solder test can leave residue. Measure a sibling coupon or a spare area instead.
Test flux spreads on clean metal to angles below the 10° lower limit. Read flux surface tension by pendant drop, not flux contact angle.
Small pads may be smaller than a drop. Use a flat finished area or a coupon larger than the drop footprint.
Flux solvent evaporates from a hanging drop. Read at a fixed short drop age and use fresh drops.
No published table links contact angle or flux surface tension to J-STD-003 results. Set bands from your own correlation study.
The Dropometer has no temperature control. Record room temperature and keep it steady between flux readings.
FAQ

Frequently asked questions

What does IPC J-STD-003 test?

It tests whether printed board pads, surface conductors and plated through holes wet with molten solder, to show that fabrication and storage have not harmed solderability. The edge dip, wave solder, surface mount simulation and solder float tests are judged by eye. The wetting balance test measures wetting force over time. The current revision is J-STD-003D, from October 2022.

Can the Dropometer run IPC J-STD-003?

No. Every J-STD-003 test dips the board in molten solder, and the Dropometer works at 10 to 45 °C. It measures none of the standard's quantities: solder coverage, hole fill or wetting force. It complements the workflow with room temperature checks before the test: flux surface tension by pendant drop and finish water contact angle on a sibling coupon.

Can a water contact angle predict IPC J-STD-003 results?

Not on its own. A higher angle than your reference shows the finish has changed, often from residue, organic film or ageing. Whether that change leads to a J-STD-003 failure depends on your finish and process. Log contact angles next to your solder results, and set a hold band from that correlation study.

Why measure the surface tension of the solderability test flux?

Solder can only wet a pad the flux has already wet. A change in flux surface tension from your reference lot points to solvent loss or contamination. The Dropometer reads it by pendant drop with ±0.03 mN/m accuracy. Keep the flux maintenance checks the standard specifies; this is an extra trend. See surface tension of common liquids.

What is the difference between J-STD-002 and IPC J-STD-003?

J-STD-002 covers the solderability of component leads, terminations and wires. IPC J-STD-003 covers printed boards: pads, surface conductors and plated through holes. Both use an activated rosin test flux and molten solder, so the Dropometer runs neither test.

What solder temperature does IPC J-STD-003 use?

The bath temperature depends on the solder alloy and is set in the standard. A board maker's guide gives 235 °C for tin lead and 255 °C for lead free SAC305 (source: JLCPCB solderability testing guide). Use the values in your edition. These are far above the Dropometer operating range of 10 to 45 °C.

Legal note

This page summarises IPC J-STD-003 in our own words and does not reproduce the standard. Buy the current edition from IPC before you write a procedure. The Dropometer complements the workflow: it measures flux surface tension and finish contact angle at room temperature and does not measure solder wetting. Droplet Lab does not certify compliance. Your own method validation does.

View the official standard Book a 15 minute demo

How this page was created

Sources, review and tools

Transparency 4 checklist items
01

Sources

DIN Media listing: IPC J-STD-003D, Solderability Tests for Printed Boards (2022-10-01); IPC J-STD-003D table of contents; ANSI webstore: IPC J-STD-003D-2023; ANSI preview: IPC J-STD-003C with Amendments 1 and 2 (scope and purpose), the Dropometer product specification and Droplet Lab validation papers.

02

Drafting assistance

Drafted with Claude (Anthropic) from the sources listed, then reviewed by Droplet Lab.

03

What we did not do

We did not copy text from the standard. Buy the current edition for the full procedure.

04

Last checked

October 2026

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Correction Request

We work hard to keep this page accurate and up to date. If you spot an error (wrong revision/year, missing requirement, incorrect interpretation, or broken link), tell us and we'll review it.

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References

1. IPC J-STD-003D (2022). dinmedia.de/en/standard/ipc-j-std-003d/365185951
2. IPC J-STD-003D table of contents. electronics.org/TOC/J-STD-003D_TOC.pdf
3. ANSI webstore: IPC J-STD-003D-2023. webstore.ansi.org/standards/ipc/ipcstd003d2023
4. ANSI preview: IPC J-STD-003C with Amendments 1 and 2 (scope and purpose). webstore.ansi.org/preview-pages/IPC/preview_J-STD-003C-WAM1-2.pdf
5. Droplet Lab. Peer reviewed validation papers in Review of Scientific Instruments and Colloids and Surfaces A. dropletlab.com/validation/publications/
6. Droplet Lab. Dropometer product specification, 2026. dropletlab.com/products/dropometer/