ASTM D774 Bursting Strength Testing for Paper & Paperboard
ASTM D774/D774M test method applies to single or laminated flat sheets. This test method should not be used to evaluate corrugated boxboard, liner board, or hardboards, as these materials have a tendency to cut the thin rubber diaphragm. The final results of this method are displayed as per the international standards.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM D774 / D774M describes the test method for determining the bursting strength of paper and paperboard — the hydraulic pressure required to rupture a paper specimen when force is applied through a rubber diaphragm. Bursting strength is a key packaging paper quality parameter that reflects the combined tensile and extensional properties of the sheet.
This test is widely used in the paper, packaging, and corrugated board industries to control product quality, qualify materials for specific packaging applications, and ensure compliance with paper and board specifications.
Scope, Applications, and Benefits
Scope
ASTM D774 evaluates:
- Bursting strength of paper and paperboard (kPa or psi)
- Burst index (bursting strength/grammage)
- Comparative burst performance of different paper grades
- Effect of moisture content on bursting strength
Applications
- Kraft paper and multi-wall sack paper qualification
- Corrugated board linerboard quality control
- Packaging paper specification compliance
- Tissue and specialty paper characterization
- Paper mill process control and grading
Benefits
- Simple, rapid, and reproducible single-specimen test
- Widely specified in paper and packaging standards
- Burst index enables basis weight-independent comparison
- Suitable for a wide range of paper and board weights
- Complies with TAPPI T403 and ISO 2758 aligned methods
Test Process
Specimen Conditioning
Paper specimens are conditioned at 23 °C and 50% RH for a minimum of 4 hours before testing per ASTM D685.
1Specimen Clamping
A circular specimen is clamped between the annular clamping rings of the Mullen burst tester, holding it flat without wrinkling.
2Hydraulic Pressure Application
Hydraulic pressure is increased at a defined rate by expanding the rubber diaphragm beneath the specimen until it ruptures; the peak pressure is recorded.
3Burst Index Calculation
The bursting strength (kPa or psi) is recorded; burst index is calculated by dividing bursting strength by the paper's grammage (g/m²).
4Technical Specifications
| Parameter | Details |
|---|---|
| Test Principle | Hydraulic diaphragm pressure to rupture |
| Applicable Materials | Paper, paperboard, multi-wall sack, linerboard |
| Pressure Range | 70–1400 kPa (instrument dependent) |
| Clamping Area | 30.5 cm² (standard) |
| Rate of Pressurization | Rupture in 15–30 seconds |
Instrumentation Used for Testing
- Mullen burst tester (hydraulic diaphragm type)
- Calibration standard burst discs
- Environmental conditioning chamber
- Precision scale for grammage determination
- Data recording system
Results and Deliverables
- Bursting strength (kPa or psi) — mean and standard deviation
- Burst index (kPa·m²/g)
- Individual specimen test data
- Specification compliance statement
- Full test report per ASTM D774
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Frequently Asked Questions
Burst index normalizes bursting strength by paper grammage (basis weight), allowing meaningful comparison of papers of different weights. A heavier paper will naturally have higher bursting strength; burst index reveals whether the inherent fiber network quality is equivalent.
Higher moisture content generally reduces bursting strength by plasticizing fiber bonds and reducing inter-fiber bonding strength. Standardized conditioning at 23 °C/50% RH before testing is therefore mandatory for reproducible results.
ASTM D774, ISO 2758, and TAPPI T403 are based on the same Mullen hydraulic diaphragm principle. Minor differences exist in conditioning requirements and reporting units. Results are broadly comparable but not always numerically identical due to procedural differences.
Requirements vary by application. Typical kraft paper for bags and multi-wall sacks requires burst strengths of 400–700 kPa or higher. Corrugated linerboard may require 200–400 kPa depending on grade and end-use specification.
ASTM D774 recommends testing a minimum of 10 specimens to obtain a statistically reliable mean and standard deviation. Both machine direction (MD) and cross direction (CD) sampling are recommended for anisotropic papers.
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