Glass Surface Tension Tester by Fiber-Shrinkage Method
The BML-II measures glass surface tension in the softening-temperature range by the fiber-shrinkage method. It suspends a glass fiber in a controlled tubular furnace and calculates surface tension from the equilibrium between the softened neck and the lower fiber weight.
- Model
- BML-II
- Category
- Glass Testing
Product Description
A glass fiber is heated locally while the furnace temperature rises and holds. The softened high-temperature section contracts under surface tension and forms an olive-shaped node; the lower fiber weight is measured after the node reaches equilibrium.
The test setup comprises a vertical furnace and thermocouple with programmed PID heating and holding; glass-fiber preparation uses a round, uniform fiber.
Technical Specifications
| Parameter | Specification |
|---|---|
| Method | Fiber-shrinkage method |
| Furnace tube | Ø30 × 300 mm |
| Maximum temperature | 1,200 °C |
| Operating temperature | 1,000 °C |
| Temperature sensor | K-type thermocouple |
| Uniform-temperature-zone length | 100 mm |
| Fiber preparation | Glass rod drawn to a round, uniform fiber |
| Fiber-diameter error | ≤0.05 mm |
| Control | Silicon-controlled-rectifier voltage regulation; intelligent PID controller; programmable heating and holding |
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