The CCSi ASTM D1329 38 mm Specimen Cutting Die produces precision 38 mm circular specimens for thermal conductivity testing of insulating materials in accordance with ASTM D1329.
Every die is manufactured from premium American-made tool steel using CCSi’s fully integrated manufacturing process. Grinding, machining, heat treatment, wire EDM, sharpening, and dimensional verification are completed in-house to ensure exceptional cutting accuracy and long-term durability.
The 38 mm diameter configuration is ideal for laboratories requiring smaller test specimens while maintaining compliance with ASTM D1329 dimensional requirements.
Key benefits include:
- Clean, distortion-free specimen preparation
- Precision-machined cutting edge
- Vertical Wire EDM walls for repeated sharpening
- Certified dimensional accuracy
- Protective foam-lined storage case
Optional accessories and calibration services are available to help laboratories maintain consistent specimen quality over the life of the die.
CCSi manufactures these high quality Specimen Cutting Dies for the determination of the Temperature Retraction (TR) for the evaluation of the effects of crystallization and for the comparison of the viscoelastic properties of rubber and rubber-like materials at low temperatures, as described in ASTM D1329, “Standard Test Method for Evaluating Rubber Property—Retraction at Lower Temperatures (TR Test).”
This test method is carried out by:
- elongating the specimen;
- locking it in the elongated condition;
- “freezing” it to a state of reduced elasticity;
- releasing the specimen and allowing it to retract freely while raising the temperature at a uniform rate;
- measuring the length of the specimen at regular temperature intervals while it is retracting;
- computing the percentage retraction at the temperature intervals.
Three die lengths (the narrow rectangular portion) are specified in the method: 25, 38, and 51 mm, while the end “tabs” are all of the same dimensions. These are used according to the ultimate elongation and the limitations of the specimen racks.
In practice, the temperatures corresponding to 10% (TR10) and 70% (TR70) retraction are of particular importance.
The difference in the temperature between 10% retraction and 70% retraction increases correspondingly to an increase in crystallization. Where TR70 correlates with low-temperature compression set, TR10 correlates with brittleness points in vulcanizates with similar polymers. The retraction rate correlates with low temperature flexibility of both crystallizable and non-crystallizable rubbers.
This test provides for the evaluation of the effect of crystallization and comparing viscoelastic properties of materials at low temperatures. When employed in conjunction with other low temperature tests, it is very useful in selecting materials for low temperature applications.
Options include:
- ISO-17025 Certification
- Arbor Press Adapter (post type, dimensions to be specified at purchase)
- Mallet Handle
- NAEF brackets and ejectors
- Custom brackets and adapters
$845.00
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