berita perusahaan tentang ASTM D724: Contact Angle Tester

ASTM D724: Contact Angle Tester

Preface

As is known to all, nanomaterials science and engineering have become the world's research hotspots. When studying the surface modification of nanomaterials, the concept of wetting contact Angle is often involved.Contact Angle refers to the level of a solid plane drops of a droplet and solid on the surface of the solid - liquid - gas three-phase junction, the gas-liquid interface and the solid-liquid interface two tangent to clamp the liquid phase in the Angle.

Ⅰ. Understanding ASTM D724

ASTM D724 is a widely recognized standard test method that specifies the procedure for determining the contact angle of liquids on solid surfaces using the sessile drop technique. It provides a uniform and repeatable way to measure surface wettability, hydrophobicity, and surface energy characteristics of nonporous solid materials. This standard is essential for material research, quality control, and performance verification in plastics, coatings, metals, glass, and composite industries.

Ⅱ. The Contact Angle Tester: Core Instrument for Surface Wettability Measurement

The Contact Angle Tester is a precision optical instrument developed to fully comply with the requirements of ASTM D724. It integrates an optical imaging system, precision liquid dosing module, highresolution camera, and professional analysis software to capture and calculate the contact angle between liquid droplets and solid surfaces. The instrument ensures stable lighting, accurate droplet volume control, and automatic edge detection to deliver reliable and repeatable test results.

Ⅲ. Working Principle of the Contact Angle Tester

Based on the sessile drop method defined in ASTM D724, the tester forms a microliquid droplet of controlled volume onto a flat, clean solid surface. The camera captures the side profile of the droplet, and the builtin software analyzes the droplet shape to compute the contact angle at the threephase boundary of liquid, solid, and gas. Common calculation methods include the tangent method, circle fitting method, and elliptical fitting method, which support static contact angle, dynamic contact angle, and surface energy measurement.

Ⅳ. Key Functions and Features

l Measures static contact angle, advancing angle, and receding angle in full compliance with ASTM D724

l Supports automatic or manual liquid dispensing with high precision

l Provides highspeed image capture and oneclick contact angle calculation

l Calculates surface free energy and its polar and dispersive components

l Stores test data, generates reports, and supports data export for quality traceability

l Compatible with various liquids such as pure water, diiodomethane, and formamide

V. Application Field of Contact Angle Measurement Instrument 

1. TFT - LCD panel industry: glass panel and the coating quality of cleanliness measurement;TFT printing circuit, color filter, ITO conductor film and other pre-coating quality measurement

2. Printing, plastic industry, surface cleaning and the adhesion quality measurement;Measurement of ink adhesion;Compatibility measurement of glue colloidal properties;The fastness of the dye

3. Semiconductor industry: a wafer cleanliness measurement;Control of HMDS;Research of CMP research and measurement, photoresist and imaging agents

4. Chemical materials research: waterproof and hydrophilic materials research;The surface activity and detergent's tension and humidity;Adhesion enhancement and adhesion surface can be measured

5. IC encapsulation: substrate surface cleanliness;Identification of atomic synthesis;BGA welding surface;The adhesion of epoxide is measured.

Ⅵ. The Value of ASTM D724 Compliance

Adopting the ASTM D724 standard ensures that contact angle measurements are globally consistent, comparable, and credible. It eliminates deviations caused by different operating methods and equipment parameters, making test results acceptable for international trade, product certification, and technical communication. As surface performance becomes more critical for advanced materials, the demand for standardcompliant contact angle testing instruments will continue to grow steadily.