Anneal & Strain
The annealing and strain points of a glass are widely used production control parameters. Changes in the annealing and strain point temperatures are indications of chemistry changes.
According to ASTM C-336 the annealing point temperature is the temperature at which a uniform fiber of glass (0.65 mm in diameter) elongates under an applied weight at a rate of 0.14 millimeters per minute while cooling in a special furnace at the rate of 4°C per minute. According to ASTM C-336 the strain point temperature is determined by extrapolation of the annealing point data and is the temperature at which the elongation rate is 0.0316 times the elongation rate observed at the annealing point.
This test is performed in an LVDT extensometer system that is manufactured by Orton. The Orton Model ANS Series has been designed to automatically monitor the elongation of the sample fiber and calculate the annealing and strain points according to the ASTM C-336 method.
(Note: If forming a fiber is not desired, is impractical, or impossible, annealing and strain point temperatures can still be determined by the Beam Bending Viscometer method, ASTM C-598.)
Model ANS-800
General
A laboratory bench-top system for automatically determining annealing point temperature and strain point temperature of a glass fiber below 800C.
Operated according to ASTM C-336 Method A or modified version of this procedure.
Includes
- Bench top instrument console
- 800°C furnace
- programmable process controller
- measuring head with LVDT sensor
- type “S” thermocouple
- 1Kg load weight
- computer software
- accessories and instruction manual. (Computer not included.)
Specifications
| Model | ANS-800 |
| Warranty | 12 Months |
| Accuracy | +/-2C |
| Atmosphere | Air |
| Temperature Range | RT to 800°C |
| Furnace Core | Copper |
| Heated Length | 10.75 inches (273 mm) |
| LVDT Displacement Range | ±0.500 inch (±12.7 mm) |
| LVDT Sensitivity | 0.7 mV/V/.001 inch(28 mV/V/mm) |
| Load | 1 Kg |
| Thermocouple | Type “S |
| Sample Size | 508 mm long x 0.65 mm diameter |
| Power Requirements | 120vac/10 amp or 240vac/5amp, 50 or 60hz |
| Computer Requirements | Desktop with available PCI slot |
| Power Control | SSR |
| Temperature Control | Honeywell UDC 3200 Process controller |
| Computer Interface Software | Included |
| SRM Calibration samples | Optional |
| Bench-top Footprint (stand)Length x Depth x Height | 12 x 12 x 33 (31 x 31 x 84 mm) |
| Bench-top Footprint (controller)Length x Depth x Height | 18 x 12 x 5 (46 x 31 x 13 cm) |