一. What is high temperature contact angle? Why measure it?

       Contact angle is an important parameter to characterize the wettability of liquid and solid surface. Especially in high

temperature industrial fields (such as metallurgy, ceramics, welding, glass manufacturing, etc.), the wetting behavior of

materials in high temperature molten state directly affects product quality and process optimization. For example, the 

wettability of molten metal and furnace wall in metallurgical process determines the scale formation speed, and the 

wettability of solder in welding process is directly related to welding strength.

      However, high temperature environment has strict requirements on measurement equipment, which needs to take into 

account high temperature stability, vacuum compatibility, precise temperature control and anti-interference imaging 

technology. Traditional contact angle measuring instruments are difficult to meet such requirements, and professional high 

temperature contact angle such as sindin Precision SDC-1500 solves these technical problems through innovative design.

二. Principle of high temperature contact angle measurement technology

1. Core measurement method

High temperature contact angle measurement needs to be carried out in a controlled environment. 

Common methods include:

① Sedimentary drop method: drop molten liquid droplets on the solid surface, record the droplet morphology through the 

optical system and calculate the contact angle.

② Hanging drop method: suitable for synchronous measurement of surface tension of high-temperature melts, and analyzes 

surface tension and contact angle by fitting the droplet profile.

③ Dynamic analysis: Real-time monitoring of the effect of temperature changes on wettability, such as SDC-1500 supports 

dynamic analysis of wetting and video fitting, which can capture rapidly changing wetting processes.

2. High-temperature environment control

High-temperature measurement requires precise temperature control and vacuum/atmosphere adjustment:

① Temperature range: sindin SDC-1500 supports room temperature to 1500℃ under normal pressure, and can reach 

1400℃ under vacuum environment (optional).

② Temperature control accuracy: 30-segment intelligent program temperature control is adopted, the maximum heating rate 

is ≤10℃/min, and the temperature control accuracy is ±0.1℃ below 1000℃ and ±1℃ above 1000℃, ensuring experimental 

repeatability.

③ Vacuum system: Equipped with a combination of mechanical pump and molecular pump (optional), the vacuum degree 

can reach 10⁻⁷Pa, meeting the needs of inert gas or reducing atmosphere.

三. Core advantages of sindin SDC-1500 high temperature contact angle meter

1. Multifunctional analysis software

① Diversity of algorithms: supports 12 fitting methods such as circle method, ellipse/oblique ellipse method, Young-Laplace 

equation, etc., to adapt to different droplet shapes.

② Dynamic analysis: real-time measurement of surface tension changes and static and dynamic contact angles, output of 

EXCEL and Word format reports.

2. High temperature resistant structure and safety design

① Heating module: high-purity alumina heating tube and quartz tube (purity 99.99%) to ensure temperature uniformity.

② Dual cooling system: dual cooling device, 5-35℃ temperature control, flow rate 15L/min cooling system capacity ≥11L, 

cooling capacity 1520W.

③ Safety protection: dual-path protective gas access and vacuum interlock control to avoid high temperature oxidation or 

sample contamination.