North Guang Precision Instrument CZF-5 Horizontal & Vertical Plastic Combustion Tester

Overview

The North Guang Precision Instrument CZF-5 Horizontal & Vertical Plastic Combustion Tester is a fully compliant benchtop apparatus engineered for standardized flammability evaluation of polymeric materials and electrical enclosures under controlled flame exposure conditions. It operates on the principle of calibrated Bunsen burner ignition—applying a defined methane- or propane-fueled flame at precise height, angle, and duration—to assess critical fire response parameters including afterflame time, afterglow time, flaming droplet formation, and substrate ignition. The system conforms to the core test methodologies specified in UL 94 (V-0, V-1, V-2, HB, 5V, HF-1, HF-2, HBF), IEC 60695-11-10, IEC 60695-11-20, ASTM D635, ASTM D5048, and GB/T 2408–2008. Its design ensures repeatable thermal flux delivery and spatially stable flame geometry, enabling reproducible classification of material behavior under horizontal (HB) and vertical (V-rating) configurations. The tester supports both single-cycle and multi-cycle ignition protocols, accommodating sequential testing of multiple specimens without manual intervention.

Key Features

• Adjustable Bunsen burner assembly with precision-machined tip (9.5 mm ± 0.3 mm inner diameter) and calibrated 0°–45° angular positioning mechanism, equipped with engraved stainless steel scale for traceable orientation control.
• Dual-mode combustion chamber (0.75 m³ standard volume) constructed from powder-coated structural steel, featuring integrated φ100 mm exhaust ducting and sealed ventilation fan to maintain atmospheric isolation during test execution—meeting mandatory enclosure integrity requirements per UL 94 Section 7.2.
• Automated ignition sequence via high-reliability piezoelectric spark generator, eliminating operator-dependent flame initiation variability.
• Modular fixture system comprising UL-compliant horizontal, vertical, and flexible specimen holders—each with three-axis (X/Y/Z) micrometer-adjustable positioning, replicating ATLAS-certified kinematic alignment standards.
• Imported differential pressure gauge (Dwyer U-tube manometer) mounted directly on front panel for real-time gas flow verification; paired with Japanese-sourced digital pressure transducer and IR remote interface for non-contact parameter setting.
• Embedded timing architecture using YOTO time relays and Autonics programmable counters, synchronized with Omron industrial-grade relay logic for sub-second event resolution and cycle repeatability.
• Integrated safety interlocks including door-position sensors, overtemperature cutoff, and flame-out detection—ensuring compliance with IEC 61000-4-2 ESD immunity and Class II electrical protection requirements.

Sample Compatibility & Compliance

The CZF-5 accommodates rigid and semi-rigid plastic specimens up to 130 mm × 13 mm × 12.5 mm (vertical) or 125 mm × 13 mm × 12.5 mm (horizontal), as well as foam materials meeting HF-1/HF-2 dimensional criteria. It supports evaluation of complete enclosures—including mobile equipment housings (>18 kg and ≤18 kg), stationary appliance casings, internal insulating components, and PCB substrate laminates. Test outcomes satisfy regulatory submission requirements for CE marking (EN 60335-1 Annex P), RoHS-compliant material declarations, and UL Component Recognition. All operational sequences are documented with GLP-aligned audit trails when interfaced with optional data logging modules. The system’s flame calibration protocol—validated using NIST-traceable K-type thermocouples (0.5 mm armored, insulated) and certified copper reference masses—is aligned with ISO/IEC 17025 laboratory accreditation prerequisites for fire testing laboratories.

Software & Data Management

While the base CZF-5 operates via embedded digital controls, an optional RS-485/USB data acquisition module enables connection to Windows-based analysis software (compatible with Windows 10/11, .NET Framework 4.8). This software provides synchronized timestamping of ignition events, automatic calculation of UL 94 pass/fail thresholds (e.g., total afterflame ≤ 50 s across 10 applications for V-0), exportable CSV reports with metadata (operator ID, ambient T/RH, calibration date), and electronic signature support compliant with FDA 21 CFR Part 11 Annex 11 principles. Audit logs record all parameter modifications, test start/stop triggers, and hardware fault codes—retained for ≥36 months per GMP documentation retention guidelines.

Applications

• Flammability grading of engineering thermoplastics (PC, ABS, PP, PA6/66) and thermosets (epoxy, phenolic) used in consumer electronics housings.
• Qualification of flame-retardant additives (e.g., brominated, phosphorus-based, or mineral-filled formulations) per UL 746C comparative tracking index (CTI) correlation studies.
• Pre-certification screening for lighting fixtures (IEC 60598-1 Clause 13), power supply enclosures (UL 62368-1 Annex G), and industrial control panels (UL 508A).
• Material selection support for automotive interior components subject to FMVSS 302 and ISO 3795.
• Internal R&D validation of halogen-free cable jacketing compounds (LSZH) against IEC 60332-1-2 vertical tray flame propagation limits.

FAQ

What flame gases are compatible with the CZF-5, and how is calorific value verified?
Valid fuels include 98% pure methane, natural gas with nominal heating value of 37 MJ/m³ ± 1 MJ/m³, or propane. Calorific value must be confirmed via certified gas chromatography report or supplier certificate of analysis prior to test execution.

Is temperature ramp calibration mandatory before each test series?
Per UL 94 Section 5.2.2 and IEC 60695-11-10 Clause 8.3, flame temperature profile verification is required at least once per shift or upon any gas supply change, using the optional copper mass and K-type thermocouple calibration kit.

Can the CZF-5 perform simultaneous horizontal and vertical tests without reconfiguration?
No—fixture orientation requires manual swapping between horizontal and vertical holders. However, both fixtures are pre-aligned to common datum points, reducing setup time to <90 seconds per configuration change.

Does the system meet CE Machinery Directive requirements for built-in safety functions?
Yes. The enclosure integrates EN ISO 13857-compliant access guarding, emergency stop circuitry per EN 60204-1, and flame failure shutdown per EN 61508 SIL-2 functional safety architecture.

What maintenance intervals are recommended for long-term measurement stability?
Burner tip inspection every 200 cycles; thermocouple recalibration annually or after 500 ignition events; pressure gauge zero-check before each daily use; full mechanical alignment verification every 6 months by authorized service technician.