Brookfield PBT-5000 Paperboard Burst Strength Tester

Overview

The Brookfield PBT-5000 Paperboard Burst Strength Tester is a precision-engineered hydraulic analog/digital hybrid instrument designed to measure the bursting strength of corrugated fiberboard, solid fiberboard, and related flexible packaging materials. It operates on the Mullen principle—applying uniformly increasing hydraulic pressure via a rubber diaphragm until specimen rupture occurs—yielding a direct reading of burst resistance in kPa or psi. This method provides a robust, standardized assessment of internal structural integrity and inter-fiber bond strength, critical for evaluating the ability of shipping containers to withstand stacking loads, handling impacts, and environmental compression during distribution. Unlike tensile or compression testers, the burst test captures localized failure behavior under isotropic stress, making it indispensable for quality assurance in packaging engineering and regulatory conformance workflows.

Key Features

• Hydraulic pressure system with calibrated Bourdon tube gauge and digital peak-hold display for repeatable rupture point capture
• Standardized 31.7 mm (1.25 in) clamping diameter compliant with ISO 2759, ASTM D2210, and TAPPI T403 geometries
• Automatic pressure ramp control ensuring consistent strain rate (±5% tolerance per ISO 2759 Annex A)
• Interchangeable anvil assemblies supporting both flat-sheet and pre-cut circular specimens (diameter tolerance ±0.1 mm)
• Mechanically stabilized base frame with vibration-dampening feet for high-reproducibility measurements across multi-shift operations
• Manual release valve and emergency pressure dump mechanism meeting CE machinery directive safety requirements

Sample Compatibility & Compliance

The PBT-5000 accommodates paperboard substrates ranging from 0.15 mm to 6.0 mm thickness, including single- and double-wall corrugated board, solid bleached sulfate (SBS), recycled fiberboard, and laminated composites. It is routinely employed for testing synthetic leather, coated textiles, and nonwoven packaging films where puncture resistance correlates with burst performance. The instrument satisfies metrological traceability requirements under ISO/IEC 17025 when operated with certified reference standards (e.g., NIST-traceable burst calibration discs). Its design aligns with Good Laboratory Practice (GLP) documentation needs, supporting audit-ready records for FDA-regulated packaging validation (21 CFR Part 11–compliant data logging optional via RS-232 interface).

Software & Data Management

While the base model features analog-digital dual-readout capability, optional firmware upgrade enables USB-connected PC integration via Brookfield’s proprietary TestLink™ v3.2 software. This platform supports automated test sequencing, statistical process control (SPC) charting (X̄-R, Cp/Cpk), and export to CSV, PDF, or XML formats compatible with LIMS environments. All test logs include timestamp, operator ID, environmental conditions (optional humidity/temperature sensor input), and raw pressure-time curves—enabling full forensic reconstruction per ISO 17025 clause 7.8. Audit trails are immutable and password-protected, fulfilling data integrity requirements for GMP-aligned packaging qualification protocols.

Applications

• Validation of corrugated box performance per ISTA 1A/2A and ASTM D642 compression correlation studies
• Supplier qualification against tier-1 automotive OEM packaging specifications (e.g., Ford WSS-M99P1111-A, GMW14872)
• Process control in paper mill QC labs for linerboard and medium consistency verification
• Regulatory submission support for medical device packaging per ISO 11607-1 Annex B burst resistance criteria
• Comparative analysis of recycled content impact on fiber network cohesion in sustainable packaging R&D
• Failure mode analysis in conjunction with edge crush test (ECT) and flat crush test (FCT) datasets

FAQ

What is the maximum measurable burst strength range of the PBT-5000?
The standard configuration measures up to 2,400 kPa (350 psi); extended-range models (PBT-5000-HR) support up to 6,000 kPa (870 psi) with recalibrated diaphragm and pressure transducer.
Does the instrument require periodic recalibration?
Yes—annual calibration against NIST-traceable burst standards is recommended; internal zero-point verification should be performed daily per ISO 2759 Section 6.2.
Can the PBT-5000 test wet-strength papers?
Yes, provided specimens are conditioned per ISO 187 (23°C ±1°C, 50% RH ±2%) prior to testing; optional humidity-controlled test chamber accessory available.
Is operator training included with purchase?
Brookfield provides complimentary remote operator certification (2 hours) and a bilingual (EN/CN) GLP-compliant SOP manual aligned with ISO/IEC 17025 clause 6.2.3.
How does burst strength correlate with box compression test (BCT) results?
Empirical correlations exist (e.g., McKee equation), but burst strength alone is not predictive of BCT; it serves as a complementary indicator of fiber quality and bonding efficiency within the board structure.