# Pendant Drop Surface Tension Measurement > Provides accurate liquid property analysis for surface tension. Source: https://covalent.com/techniques/mechanical-testing/pendant-drop-method-surface-tension-measurement/ Updated: 2026-04-22T23:59:57+00:00 --- ![](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/themes/covalent/assets/images/blog-default-banner.jpg) ![](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/themes/covalent/assets/images/blog-mobile-banner.jpg) [Core Lab](https://covalent.com/covalent-core-lab/) # Pendant Drop Surface Tension Measurement Covalent Metrology offers Pendant Drop Surface Tension Measurement for accurate liquid property analysis. This technique helps understand liquid-surface interactions, crucial for coatings, adhesives, and material development. We provide reliable data for product innovation and performance. [Add to Quote](#) ## What Is Pendant Drop Surface Tension Measurement? Pendant drop surface tension measurement is a technique used to determine the surface or interfacial tension of a liquid by analyzing the shape of a droplet suspended from the end of a syringe or capillary. The shape of the droplet, influenced by the balance between gravity and surface tension, is captured and fitted to the Young–Laplace equation to calculate the surface tension. High Precision Results ### High Precision Results Reliable and consistent surface/interfacial tension measurements, even with very small liquid samples. Rapid and Accessible ### Rapid and Accessible Fast turnaround with secure digital reports, available anytime for easy review and sharing. Non‑Destructive Testing ### Non‑Destructive Testing Preserves valuable or sensitive samples, ensuring accurate analysis without material loss. ## Why Use Pendant Drop Surface Tension Measurement? Pendant drop surface tension measurement is widely applied in research and industry to evaluate fluid behavior, surfactant efficiency, and interfacial interactions in formulations and coatings. ### Surfactant Performance Quantifies surface tension reduction to evaluate surfactant and additive effectiveness. ### Formulation Optimization Critical for developing stable coatings, adhesives, and emulsions by understanding interfacial behavior. ### Quality Control and R&D Supports both rapid [QC](/solutions/quality-control-qc-testing/) and advanced research for product innovation and material development. ## Covalent’s Capabilities Offer Pendant Drop Measurement for Liquid Analysis and Interfacial Characterization [Get a Quote](https://covalent.com/contact-us/) ## Working Principle A pendant drop measurement works by suspending a backlit droplet from the tip of a needle or capillary and capturing its shape using a high-resolution camera. Automated image analysis software is used to extract the droplet’s and mathematically fit it using the Young–Laplace equation, which relates the shape of the drop to the surface or interfacial tension based on the balance between gravity and surface forces. ### Equipment Used for Pendant Drop Surface Tension Measurement: #### Ossila Contact Angle goniometer - Angle range: 5° to 180°. - Max measurement speed: 33 ms (30 fps). - Maximum Camera Resolution 1920 x 1080. Typical liquid droplets are on the order of microliters. [View Spec Sheet](https://www.ossila.com/products/contact-angle-goniometer) ### Key Differentiators #### Strengths - Rapid, inexpensive and sensitive assessment of surface tension. #### Limitations - Highly volatile liquids can be difficult to measure. Two colleagues working together on a laptop, discussing a project in a bright, professional environment. ## Unsure Whether Pendant Drop Measurement Is Right for You? Learn more about using Pendant Drop measurement today. [Talk to an Expert](https://covalent.com/contact-us/) ## Sample Information Example Output Sample Requirements [https://covalent.com/wp-content/uploads/2025/12/pendant-drop-measurement-output.png](https://covalent.com/wp-content/uploads/2025/12/pendant-drop-measurement-output.png) From the droplet shape we calculate the surface tension, for example water has a high surface tension of 72 millidynes per centimeter at room temperature. Sample prep is straightforward, which makes this a fast and efficient testing option. To get the best results, liquid samples need to be clean, bubble and particle free. Covalent Metrology provides clear instructions to help you provide a clear sample, if materials need special handling, our team is ready to step in with expert support and custom solutions. ### What we accept: - Liquid sample. - Hazardous liquids can be handled by moving the instrument into a fume hood. - While typically the droplet is suspended in air, the drop can also be suspended in another liquid contained in a cuvette to measure the interfacial energy between 2 liquids. ## Use Cases - Coatings/Paints/Inks - Pharmaceuticals & Biotech - Cosmetics & Personal Care - Food & Beverage - Chemical Manufacturing - Semiconductor & Electronics Cleaning - Polymer & Material Science - Environmental & Wastewater Analysis - ![Coatings/Paints/Inks](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/Paints-and-Coatings-260x300.jpg) ### Coatings/Paints/Inks Measuring surface tension of formulations to optimize wetting, leveling, and substrate adhesion. - ![Pharmaceuticals and Biotech](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/Pharmaceutical-Industry.jpg) ### Pharmaceuticals & Biotech Quantifying protein or surfactant effects on air–liquid and oil–water interfaces in drug formulations. - ![](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/Cosmetics-and-Personal-Care.jpg) ### Cosmetics & Personal Care Determining interfacial tension to design stable emulsions in creams, lotions, and shampoos. - ![Food and Beverage](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/Food-and-beverage.jpg) ### Food & Beverage Optimizing emulsifier concentration for stable emulsions and foams. - ![Chemical Manufacturing](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/uc-chemical-industry.jpg) ### Chemical Manufacturing Characterizing solvent mixtures and surfactants to control blending and separation behavior. - ![Semiconductor and Electronics Cleaning](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/Semiconductor-Battery-and-Materials-Industries.jpg) ### Semiconductor & Electronics Cleaning Measuring surface tension of cleaning and rinsing solutions to control wetting and residue removal. - ![Polymer and Material Science](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/11/Polymers.jpg) ### [Polymer & Material Science](/applications/polymer-and-plastic-analysis-testing-services/) Determining interfacial tension between polymers and liquids for coating, adhesion, or composite design. - ![Environmental and Wastewater Analysis](https://spcdn.shortpixel.ai/spio/ret_img,q_cdnize,to_auto,s_webp:avif/covalent.com/wp-content/uploads/2025/12/uc-Environmental-and-Wastewater-Analysis.jpg) ### Environmental & Wastewater Analysis Assessing surfactant [contamination](/solutions/contamination-analysis/)by monitoring changes in surface tension of aqueous samples. ## Complementary Techniques - **Contact Angle:** Measures surface wettability, complementing pendant drop by showing liquid-solid interaction. - **Gas Chromatography–Mass Spectrometry (GC-MS):** Identifies liquid chemicals, complementing pendant drop by linking interfacial behavior to molecular components. [Gas Chromatography-Mass Spectrometry (GC-MS)](https://covalent.com/techniques/chemical-analysis/gas-chromatography-mass-spectroscopy-gc-ms/) Identifies and quantifies small organic molecules in mixtures. [Explore](https://covalent.com/techniques/chemical-analysis/gas-chromatography-mass-spectroscopy-gc-ms/) [Add to Quote](#) ## Why Choose Covalent for Your Pendant Drop Surface Tension Measurement Needs? Covalent has a range of techniques to characterize liquid chemistry, including gas chromatography. ## Frequently Asked Questions Identifying the right test can be complex, but it doesn’t have to be complicated. Here are some questions we are frequently asked. - ### What types of material can be tested using Pendant Drop? Pendant drop measurements can be performed on a wide range of liquids, including pure fluids, solutions, and emulsions. Even volatile or hazardous liquids can be analyzed with special precautions. - ### How much sample is required for testing? Only a small volume, typically a few tens of microliters, is needed to form the droplet for measurement. - ### What is the difference between surface tension and interfacial tension? Surface tension refers to the force at the interface between a liquid and air, while interfacial tension describes the force at the boundary between two immiscible liquids or a liquid and a solid. - ### What kind of data or report will I receive? The report typically includes measured surface or interfacial tension values, experimental conditions, and any calculated parameters, accompanied by images of the droplet profile. 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Our experts can help you determine if this approach is the best fit for your samples and discuss the next steps. [Talk to a Materials Scientist](https://covalent.com/contact-us/)