Contents
Partially compliant

ASTM D1417: standard test methods for synthetic rubber latices and latex surface tension

ASTM D1417 groups twelve tests for synthetic rubber latex, from total solids to surface tension. The Dropometer is partially compliant: it measures latex surface tension, the property the surface tension test is after, by pendant drop. Pendant drop is an alternative method, not the ring or plate method the standard specifies; if a contract or customer requires an ASTM D1417 result, run a correlation study on your own samples first. Use lab apparatus for the other eleven tests.

What brings you here?

Who this is for
Latex makers and the coatings, adhesives, carpet backing and paper coating plants that buy synthetic rubber latex.
Compliance tier
Partially compliant: the Dropometer measures latex surface tension by pendant drop, an alternative to the ring or plate method. It does not run the other D1417 tests.
Measurement
Pendant drop surface tension, static and dynamic, up to 75 mN/m, ±0.03 mN/m accuracy (Dropometer datasheet).
Setup
About 2 minutes. Battery powered, 1 kg, runs at the tank or in the lab.
Last updated
October 29, 2026
Book a 15 minute demo Request a quote

Free one page checklist for latex surface tension by pendant drop alongside ASTM D1417: what to prepare, the settings to lock, how to run a correlation with your tensiometer and what to record.

Talk to an expert

Book a 15 minute demo on your latex

Tell us your latex grade, solids and current surface tension check. We will measure it live and tell you plainly which part of your D1417 workflow pendant drop covers and where you still need other apparatus.

Book a 15 minute demo
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
Read More
Stefan Bon Photo
Technical Review by
Prof. dr. ir. Stefan A. F. Bon
Stefan Bon is a professor at the University of Warwick in Polymer and Colloid Chemical Engineering. Originally from the Netherlands, educated at the Eindhoven University of Technology (TU/e), he joined Warwick Chemistry in spring 1998. His research team, BonLab, works at the forefront of polymer and colloid science, by blending chemistry, with soft matter physics, and chemical engineering. The team is working with a variety of multinational industrial players to innovate in science, often using a green and sustainable approach. He was awarded the 2015-2016 Royal Society of Chemistry Materials Division Outreach Lecturer He is a recipient of a 2021 individual Warwick Award for Teaching Excellence (WATE). He has chaired (2021) the future/new education workgroup in the STEM-Grand Challenge. He has been honoured (2025/2026) by McMaster University with the prestigious Les Shemilt lectureship for his achievements in chemical engineering. He has been invited (4 November 2026) to give the Daniell lecture at King's College LondonLink opens in a new window. He is a Fellow of the International Union of Pure and Applied Chemistry (IUPAC), was a member 2020-2025 of the physical Newton international fellowship committee of the Royal Society, and he sits on the advisory board of two of the Royal Society of Chemistry scientific journals, RSC Applied Polymers and Soft Matter.
Professor of Polymer and Colloid Chemical Engineering, University of Warwick
Read More
Verified against ASTM D1417
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.

Stefan Bon Photo
Reviewed By

Prof. dr. ir. Stefan A. F. Bon

Professor of Polymer and Colloid Chemical Engineering, University of Warwick

Stefan Bon is a professor at the University of Warwick in Polymer and Colloid Chemical Engineering. Originally from the Netherlands, educated at the Eindhoven University of Technology (TU/e), he joined Warwick Chemistry in spring 1998.

His research team, BonLab, works at the forefront of polymer and colloid science, by blending chemistry, with soft matter physics, and chemical engineering. The team is working with a variety of multinational industrial players to innovate in science, often using a green and sustainable approach.

He was awarded the 2015-2016 Royal Society of Chemistry Materials Division Outreach Lecturer

He is a recipient of a 2021 individual Warwick Award for Teaching Excellence (WATE).

He has chaired (2021) the future/new education workgroup in the STEM-Grand Challenge.

He has been honoured (2025/2026) by McMaster University with the prestigious Les Shemilt lectureship for his achievements in chemical engineering.

He has been invited (4 November 2026) to give the Daniell lecture at King's College LondonLink opens in a new window.

He is a Fellow of the International Union of Pure and Applied Chemistry (IUPAC), was a member 2020-2025 of the physical Newton international fellowship committee of the Royal Society, and he sits on the advisory board of two of the Royal Society of Chemistry scientific journals, RSC Applied Polymers and Soft Matter.

Featured Studies & Publications

Research Paper Developing Hydration Maps of Polymer Latex Film Formation Using Terahertz Time-Domain Spectroscopy

Evidence box

Standard

ASTM D1417-16(2026), Standard Test Methods for Rubber Latices, Synthetic, from ASTM Subcommittee D11.23. Its individual test procedures cover sampling, total solids, volatile unsaturates content (residual styrene), pH value, surface tension, viscosity, coagulum, bound styrene, Mooney viscosity, mechanical stability, polystyrene reinforcement and residual acrylonitrile content. The scope names the latex types ABR, BR, CR, IIR, IR, NBR, NCR, NIR, PBR, PSBR, SBR, SCR and SIR, plus grades with carboxylic acid (COOH) groups on the polymer chain.

Compliance tier

Partially compliant. The surface tension test points to the ring or plate methods of ASTM D1331. The Dropometer measures the same property by pendant drop, an alternative method; run a correlation study on your own samples before you report a D1417 result. The other eleven tests need their own apparatus.

Instrument performance

Pendant drop surface tension up to 75 mN/m, accuracy ±0.03 mN/m, resolution 0.01 mN/m, static and dynamic, 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

We have no published client paper or case study on latex surface tension yet. For good bench practice, see reproducible surface tension measurement.

What it does not tell you

Surface tension shows how much surfactant sits at the latex surface. It does not tell you solids, stability, coagulum or the properties of the polymer material. Run those D1417 tests as the standard specifies.

Executive summary

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

ASTM D1417 is a set of standard test methods for synthetic rubber latices, covering total solids, pH, viscosity, mechanical stability, latex surface tension and more. Latex makers use the D1417 standard for lot release and quality checks. Coatings, adhesives, carpet backing and paper coating plants use it to check incoming SBR, NBR, CR and carboxylated latex.

The Dropometer is partially compliant with ASTM D1417. It measures latex surface tension, the same property as the D1417 surface tension test, by the pendant drop method. D1417 references ASTM D1331, the du Noüy ring and Wilhelmy plate standard. Pendant drop is an alternative method, not the ring or plate method the standard specifies. If a contract or customer requires a D1417 result, run a correlation study on your own samples first. The Dropometer does not run the other eleven D1417 tests.

The Dropometer pendant drop tensiometer reads static and dynamic surface tension up to 75 mN/m with ±0.03 mN/m accuracy. It runs on battery, so you can check latex at the reactor, the blend tank or the lab bench. If your customers will only accept ring or plate results, our guide to the best tensiometer for production QC compares the options.

For background, read the chemicals guide and the surface tension measurement guide.

Further reading: reproducible surface tension measurement and surface tension of common liquids, with reference values.

How the Dropometer fits the ASTM D1417 surface tension method

Latex surface tension by pendant drop, step by step, in our own words

From latex sample to a recorded surface tension

These steps cover only the surface tension part of the D1417 test procedures for synthetic rubber latices, and show where the Dropometer differs from the standard. They do not replace ASTM D1417. Buy the current edition and follow its sampling, dilution and temperature rules.

±0.03 mN/m

Surface tension accuracy

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

Static and dynamic

Reading modes

Follow surface tension as the drop ages, or read it at one fixed drop age.

About 2 min

Setup

Base plate, phone holder, LED and syringe. No PC needed.

1

Sample and condition the latex

Take the sample as the standard describes. Mix it gently so you do not trap foam. Bring the latex and syringe to room temperature, and dilute only if your procedure says so.

2

Measure the latex density

Pendant drop needs the density difference between latex and air. Measure density on the same lot, for example with a pycnometer, and enter it in the software.

3

Set up the Dropometer

Level the base plate, mount the phone and LED, and fill a clean syringe with latex without bubbles. Check the setup with deionised water first. Focus on the needle tip.

4

Form the drop and hold a fixed drop age

Form a pendant drop close to its largest stable size. Surfactant keeps moving to the new surface, so the value falls over time. Read at the same drop age every time, or record the dynamic curve.

5

Read and repeat

The software fits the drop profile with the Young-Laplace model. Form several fresh drops per lot. Discard drops that show a skin, a bubble or a speck of coagulum.

6

Record and report the method

Record the mean, spread, drop age, density, solids and room temperature. State that you used pendant drop, an alternative to the ring or plate method in D1417. Flush the needle with water between lots.

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.

Read the validation papers

Customer evidence

We have no published client paper or case study on latex surface tension yet. The surface tension measurement guide explains pendant drop and how it compares with ring and plate methods.

Read the surface tension guide

Set your limits from your own latex

ASTM D1417 · latex surface tension · lot release and incoming QC

We could not confirm a pass or fail surface tension value in ASTM D1417. Latex limits usually come from the supplier's product specification or from your own capability study.

Pendant drop is an alternative method, not the ring or plate method the standard specifies. Results are not interchangeable without a correlation study on your own latex. Measure the same lots on your ring or plate tensiometer and on the Dropometer, at the same temperature and surface age. Set your limits from that data.

Temperature matters. ISO 1409 tests latex at 23 ± 1 °C and notes that surface tension falls by about 0.1 mN/m per °C between 20 and 30 °C (source: ISO 1409:2020 preview). The Dropometer has no temperature control, so condition the latex and record room temperature.

Check the setup with deionised water before each session. Expect about 72.7 mN/m at 20 °C and 72.0 mN/m at 25 °C (source: IAPWS R1-76(2014)).

Example output

Example data for illustration only. These are not measured results. Your own latex, test conditions and limits decide the numbers.

Example: carboxylated SBR latex, four lots, pendant drop at a 60 s drop age

Lot Drops (n) Mean surface tension (mN/m) Std dev (mN/m) Room temp (°C) Decision
Lot A541.60.2122.8Accept
Lot B540.90.1823.1Accept
Lot C546.30.2523.4Above limit: hold, check emulsifier dosing
Lot D544.60.2222.9Near limit: confirm on the tensiometer

How to read this table

Each row is the mean of five pendant drops read at a 60 s drop age. The decision column uses an example specification of 38.0 to 45.0 mN/m, set from a correlation study against a ring tensiometer.

Example output chart

The same example data as the table, plotted against the example specification limits.

Bar chart of example latex surface tension for four lots by pendant drop, with Lot C above an example upper limit of 45 mN/m

Example data, not measured results.

Business impact

What changes when surface tension can be checked at the tank

Metric Before Dropometer With Dropometer Results
Where the check runs Tensiometer on a lab bench At the reactor or blend tank, on battery for up to 8 h Dropometer product specification
Sample needed A glass vessel of at least 50 cm³ for the ring One syringe fill of latex ISO 1409:2020 apparatus section
Surface age One reading per ring pull Static reading or a dynamic curve as the drop ages Dropometer product specification
Record Operator note of the dial or display value Drop image and value saved per measurement No published benchmark
Reporting to ASTM D1417 Ring or plate tensiometer Correlation study on your own latex first, or the tensiometer ASTM D1417 references ASTM D1331

See the measurement on your own latex

Bring two lots: one that ran well and one that foamed or wet poorly. We will measure both live by pendant drop.

Book a 15 minute demo Request a quote
ROI estimate

Estimate the cost of the latex lot failures this check can catch

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 and equipment settings

Lock these before you compare results between lots, shifts or sites

Parameter Recommended Setting Technical Rationale
Method Pendant drop; an alternative to ring or plate The standard uses a ring or plate tensiometer. Run a correlation study before you report or compare results.
Latex density Measured on the same lot The Young-Laplace fit needs the density difference. A wrong density shifts every result.
Drop age Fixed, for example 60 s, set in your SOP Surfactant keeps adsorbing, so surface tension falls as the drop ages.
Drop size Close to the largest stable drop A well deformed drop gives a more reliable fit than a small round one.
Fit model Young-Laplace The pendant drop shape follows the Young-Laplace equation, which the Dropometer software fits.
Replicates Several fresh drops per lot Skins, bubbles and coagulum can spoil single drops. The mean and spread show it.
Solids and dilution As the standard specifies; record solids Solids change viscosity and how fast the drop settles to its shape.
Temperature Condition latex; record room temperature The Dropometer has no temperature control. It runs at 10 to 45 °C.

Is ASTM D1417 the right test?

Pick the method by the question you need answered

Start: What do you need to know about your latex?

Latex surface tension per lot

Signals:

You want a surface tension value per lot at the reactor, blend tank or incoming dock, for QC, R&D or trend checks.

Rule-out:

Use pendant drop on the Dropometer. This is the part of ASTM D1417 it covers, by an alternative method to the ring or plate.

Surface tension reported to the standard

Signals:

A customer or specification asks for the surface tension result to ASTM D1417 or ISO 1409.

Rule-out:

Pendant drop is an alternative method, not the ring or plate method the standard specifies. Run a correlation study on your own samples first, or use a ring or plate tensiometer as in ASTM D1331 and ISO 1409.

Solids, pH, viscosity or stability

Signals:

You need total solids, pH, viscosity, coagulum, mechanical stability or polymer properties.

Rule-out:

Run those ASTM D1417 test procedures, such as determining total solids or Mooney viscosity, with the equipment the standard specifies. The Dropometer does not measure them.

Surface tension of a liquid coating

Signals:

You formulate a latex paint or coating and want a published pendant drop method.

Rule-out:

Use EN ISO 19403-3, the pendant drop method for liquid coatings.

Decision tree at a glance

Start from the question you need answered. Blue boxes are measurements the Dropometer runs.

Decision tree for latex questions: pendant drop on the Dropometer, a correlation study or ring or plate tensiometer for D1417 results, the other ASTM D1417 tests and EN ISO 19403-3

Is ASTM D1417 the right test?

Interpreting results

What latex surface tension tells you, and what it does not

Lower value, more free surfactant: A lower surface tension usually means more surfactant at the surface. That helps wetting and can raise foaming.
Drop age changes the number: Surfactant keeps moving to a fresh surface, so the value falls with time. Compare readings at the same drop age.
A jump between lots points to the recipe: A shift in surface tension often follows a change in emulsifier level or post added surfactant. Check the batch record.
Ring and pendant values can differ: Pendant drop is an alternative to the ring or plate. The methods age and stretch the surface differently, so use your correlation study before you compare them.
Expert perspective

Why method and surface age matter for latex surface tension

Surface tension versus concentration is one of the few measurements that lets you watch a surfactant reorganise an interface in real time: read the curve, not just the endpoint.

Dr. Alidad Amirfazli

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

Common pitfalls and limits

Honest limits of the method and of the Dropometer

Pendant drop is an alternative method, not the ring or plate method ASTM D1417 specifies. Run a correlation study before you report D1417 results.
Latex can dry and skin at the needle tip. Flush the needle with water between lots and discard skinned drops.
Latex with poor mechanical stability can coagulate when pushed through a fine needle. Dispense slowly.
High solids latex settles to its final drop shape slowly. Hold a fixed drop age before you read.
The Dropometer has no temperature control. Condition the latex and record room temperature with every result.
FAQ

Frequently asked questions

What does ASTM D1417 cover?

It is a set of test methods for synthetic rubber latices such as SBR, NBR, CR and carboxylated grades, which carry acid groups on the polymer chain. It covers sampling, total solids, residual styrene, pH, surface tension, viscosity, coagulum, bound styrene, Mooney viscosity, mechanical stability, polystyrene reinforcement and residual acrylonitrile.

Can the Dropometer run ASTM D1417?

Partly. The Dropometer measures latex surface tension by pendant drop with ±0.03 mN/m accuracy, so it covers the surface tension part of D1417. Pendant drop is an alternative method, not the ring or plate method the standard specifies; if a contract or customer requires a D1417 result, run a correlation study on your own samples first. It does not run the other eleven tests.

Which surface tension method does ASTM D1417 use?

D1417 references ASTM D1331, which measures surface tension with a du Noüy ring or a Wilhelmy plate. Check the current edition of D1417 for the exact method, test temperature and any dilution step before you write your SOP. Pendant drop is not one of the D1331 methods, so treat it as an alternative method.

Do pendant drop and ring results on latex match?

Not automatically. The methods age and stretch the surface differently, and latex surfactants are sensitive to that. Measure the same lots on both instruments at the same temperature and surface age, then set your limits from that correlation study.

How is ASTM D1417 different from ISO 1409?

The D1417 standard test methods cover twelve tests for synthetic latex. ISO 1409 covers only surface tension, for natural and synthetic latex and polymer dispersions, by ring (Method A) or plate (Method B). In a dispute, ISO 1409 prefers the ring method.

Does temperature affect latex surface tension?

Yes. ISO 1409 notes a fall of about 0.1 mN/m per °C between 20 and 30 °C and tests at 23 ± 1 °C. The Dropometer has no temperature control, so condition the latex and record room temperature with each result.

Legal note

This page summarises ASTM D1417 in our own words and does not reproduce the standard. Buy the current edition from ASTM before you write a procedure. The Dropometer is partially compliant: it measures latex surface tension by pendant drop, an alternative to the ring or plate method, and does not run the other D1417 tests. 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

ASTM D1417-16(2026) listing; ANSI webstore, ASTM D1417-16 listing and history; GlobalSpec ASTM D1417 document history and references (D1331, D1076, D1418, D1646); ASTM D1331-20(2024) listing, 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

Report a correction

Spotted an issue in this summary? Send a correction request and our team will review it.

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.

Contact us to report a correction

References

1. ASTM D1417-16(2026). store.astm.org/d1417-16r26.html
2. ANSI webstore, ASTM D1417-16 listing and history. webstore.ansi.org/Standards/ASTM/ASTMD141716
3. GlobalSpec ASTM D1417 document history and references (D1331, D1076, D1418, D1646). standards.globalspec.com/std/14479852/d1417
4. ASTM D1331-20(2024) listing. store.astm.org/d1331-20r24.html
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/