Introduction to ASTM D828 Test Standard
ASTM D828 is a crucial standard for evaluating the tensile properties of paper and paperboard. Established by ASTM International, this test determines tensile strength, elongation, and energy absorption using constant-rate-of-elongation testing equipment.
Key Properties Measured
- Tensile Strength at Rupture: Maximum force before breakage.
- Elongation at Rupture: Degree of stretch before failure.
- Tensile Energy Absorption: Energy absorbed before rupture.
Grips for ASTM D828 Testing
- Mechanical Vise Grips: Affordable, manual screw-action clamps with adjustable jaws.
- Pneumatic Grips: Offer consistent pressure and alignment, ideal for precise testing.
Recommended Universal Testing Machines (UTM)
For ASTM D828, 50N to 2kN UTMs are ideal. The VEW 260E UTM, a single-column desktop machine, offers accurate tensile, compression, and bending tests for various materials.
Test Procedure
- Specimen Preparation: Cut and condition specimens per ASTM D828 guidelines.
- Insertion & Alignment: Use jigs for proper specimen placement.
- Grip Pressure Optimization: Adjust grip pressure for accurate results.
- Load Application: Apply force at the specified rate.
- Test Completion: Ensure failure occurs away from grip points.
Conclusion
ASTM D828 provides standardized, reliable testing for paper and packaging industries, ensuring compliance with quality control standards in Malaysia and beyond.