Jiubin JB-2 Oxygen Index Tester
| Brand | Jiubin |
|---|---|
| Model | JB-2 |
| Origin | Taiwan |
| Compliance | GB/T 2406, GB/T 5454 |
| Oxygen Flow Range | 60–600 L/h |
| Flow Control Accuracy | ±5% |
| O₂ Supply Pressure | >0.25 MPa |
| N₂ Supply Pressure | >0.25 MPa |
| Operating Pressure (O₂/N₂ Mix) | 0.1 MPa |
| Test Gas | High-Purity O₂/N₂ Mixture |
Overview
The Jiubin JB-2 Oxygen Index Tester is a precision benchtop instrument engineered for the quantitative determination of the Limiting Oxygen Index (LOI) — defined as the minimum volume percentage of oxygen in an oxygen–nitrogen mixture required to support candle-like combustion of a vertically oriented specimen under specified laboratory conditions. Based on the fundamental principles of controlled atmospheric combustion and gravimetric flame stability assessment, the JB-2 implements standardized upward-flame propagation methodology per ISO 4589-2, ASTM D2863, GB/T 2406.2, and GB/T 5454. It delivers reproducible LOI values essential for material classification, regulatory documentation (e.g., building code compliance, transportation safety specifications), and comparative flammability screening across R&D, quality assurance, and certification laboratories.
Key Features
- Stable dual-gas mixing system with independent high-pressure O₂ and N₂ inlet paths (>0.25 MPa), enabling precise control over gas composition and delivery pressure (operating at 0.1 MPa regulated output)
- Calibrated mass flow control with ±5% accuracy across the full 60–600 L/h range, ensuring consistent gas velocity and laminar flow profile within the combustion column
- Vertically aligned stainless-steel test chamber with integrated ignition source (standardized flaming wire or match-type igniter), conforming to specimen geometry requirements for rods, sheets, films, and textiles
- Thermally insulated housing with transparent front panel for real-time visual observation of flame behavior, char formation, and afterglow duration
- Modular design compliant with standard laboratory ventilation requirements; compatible with fume hood integration for safe handling of combustion byproducts
- No embedded software or data logging — optimized for manual operation per normative test protocols requiring operator judgment on flame extinction criteria
Sample Compatibility & Compliance
The JB-2 supports standardized specimens per GB/T 2406.2 (plastics), GB/T 5454 (textiles), ISO 4589-2 (generic polymers), and ASTM D2863 (rigid and flexible materials). Compatible sample forms include molded bars (80 × 10 × 4 mm), woven/nonwoven fabrics (150 × 50 mm), foams (150 × 50 × 10 mm), elastomeric strips, paperboard, and thin films (with appropriate backing support). All test procedures adhere to GLP-aligned documentation practices. While the instrument itself does not require FDA 21 CFR Part 11 validation (as it generates no electronic records), test reports generated using external lab notebooks or LIMS systems may be structured to satisfy audit requirements for ISO/IEC 17025-accredited testing laboratories.
Software & Data Management
The JB-2 operates without onboard firmware or digital interface. All measurements are manually recorded in accordance with standard test method requirements: LOI is calculated iteratively through sequential trials, adjusting O₂ concentration until the threshold for self-sustained burning (≥3 s flaming time after ignition removal) is identified. Users maintain traceability via handwritten or LIMS-integrated test logs, including ambient temperature/humidity, specimen conditioning history (per ISO 291 or ASTM D618), batch identifiers, and observer annotations. Optional external digital thermometers and hygrometers may be used to document environmental parameters in compliance with reporting clauses of GB/T 2406.1 and ISO 4589-1.
Applications
- Comparative flammability ranking of polymer formulations during R&D (e.g., halogen-free flame retardant development)
- Quality control release testing for cable jacketing compounds, automotive interior trim, and construction-grade insulation foams
- Regulatory submission support for UL 94 pre-screening, EN 13501-1 fire classification, and FAA AC 20-135 aircraft material approval
- Evaluation of flame-retardant efficacy in natural fibers (cotton, wool blends) and technical textiles (protective clothing, upholstery)
- Teaching and demonstration of combustion kinetics and oxygen-dependent pyrolysis thresholds in university materials science laboratories
FAQ
What standards does the JB-2 comply with?
It is designed and validated for use with GB/T 2406.1–2008, GB/T 2406.2–2009, GB/T 5454–1997, ISO 4589-2:2017, and ASTM D2863–22.
Is calibration certificate included?
The unit ships with factory verification of flowmeter linearity and pressure regulator functionality; users must perform periodic verification using traceable gas flow calibrators per ISO/IEC 17025 clause 6.5.
Can the JB-2 test powders or liquids?
No — it is strictly intended for solid, self-supporting specimens meeting dimensional and structural criteria defined in referenced standards.
What gas purity is required?
Oxygen ≥99.5% (v/v) and nitrogen ≥99.9% (v/v) are recommended to avoid interference from impurities affecting ignition threshold and char morphology.
Does the instrument meet CE or UKCA requirements?
As a non-electronically controlled mechanical test apparatus without active safety circuits, it falls outside CE/UKCA mandatory scope; however, its construction follows general machinery safety principles per ISO 12100.
