UL94 Horizontal Vertical Test Apparatus

UL 94 Vertical & Horizontal Flammability Test Apparatus – Manufacturer Overview

This apparatus evaluates the burning behavior of plastics and polymer components in both vertical and horizontal orientations. It is built for repeatability, operator safety, and alignment with recognized methods. Typical uses include materials and parts for electronics, wire and cable, automotive interiors, appliance housings, rubber items, and packaging. Also known as a UL 94 flammability tester, the chamber can be customized to fit specific lab workflows.

Core Features of the UL 94 Flammability Tester

Precise Combustion Control

Stable 50 W and optional 500 W burners provide repeatable ignition conditions for vertical and horizontal tests. Adjustable flame height, accurate flowmeters, and electronic ignition help maintain consistent gas composition and flame size. Developed with reference to IEC 60695-11-10 and IEC 60695-11-20.

Versatile Fixtures

Quick-change jigs support vertical and horizontal procedures with calibrated distance guides. Tool-less clamps accommodate rigid parts, thin sheets, and cellular plastics; drip collection supports 5VA/5VB assessments.

Intelligent Timing and Recording

Digital timers capture flame application, afterflame, afterglow, and total combustion time. Optional high-speed camera and data export streamline documentation and traceability.

Safety and Build Quality

An SUS304 stainless steel chamber resists heat and corrosion. A tempered glass window, internal lighting, safety interlocks, gas cut-off, and an exhaust interface support safe and stable operation.

Standards Alignment

Designed for UL 94 vertical and horizontal methods and related practices: IEC 60695-11-10/-20, ISO 9772/9773, ASTM D3801 (vertical), and ASTM D635 (horizontal). Fixtures, flame heights, and timing functions follow method requirements.

Technical Specifications

Burners and Gas

A 50 W Bunsen burner with fine-adjust valve and flowmeter supports a 20 mm flame. The optional 500 W system provides a 125 mm flame as required for severe ratings. Compatible with methane or propane/butane, with stable control to minimize drift.

Fixtures and Motion

Interchangeable vertical and horizontal fixtures ensure accurate flame impingement distances. Heat-resistant clamps handle a range of thicknesses; a drip tray aids 5VA/5VB evaluations.

Measurement and Control

Microprocessor control sets flame application times and cycles. Auto-timing for afterflame/afterglow offers 0.1 s resolution. Optional data export supports recordkeeping.

Chamber and Exhaust

SUS304 chamber with a gasketed door, LED lighting, rear exhaust port, and removable debris tray. Heat-resistant coating supports easy cleaning and long service life.

Variant Summary

• 50 W model: Covers V-0/V-1/V-2 and HB ratings with rapid fixture change.


• 500 W add-on: Burner assembly and accessories for 5VA/5VB classification.

Models and Customization

50 W Vertical/Horizontal Model

A compact system for UL 94 V and HB methods. Suitable for compounding labs, component checks, and routine quality verification.

500 W 5VA/5VB Kit

Add a 500 W burner and accessories to evaluate severe classifications. Swap-over is straightforward while maintaining control accuracy and safety.

Custom Fixtures and Integration

Custom clamps for thin films, foams, or irregular parts, plus larger chambers for oversized samples. Optional camera, barcode, and LIMS integration support traceability.

Applications and Materials

Use this chamber for formulation screening, incoming material checks, and finished product evaluations. Outputs include V-0/V-1/V-2, HB, and 5VA/5VB classifications used in product qualification.

• Electronics and electrical: connectors, enclosures, PCBs


• Automotive and transport: interior trims, wire harness components


• Packaging and materials: films, foams, cartons

Why Choose Our Manufacturer for UL 94 Test Chambers

Our processes are ISO 9001–certified, and we participate in issuing national standards. With 17+ years of experience, 20+ utility model patents, over 3000 units delivered, and supply to 50+ countries, we provide dependable equipment and method expertise.

Engineering and Quality Control

In-house CNC machining ensures precise burner geometry and fixtures. Dedicated inspection and calibration labs verify flame stability, timing accuracy, and durability before shipment.

Service and Support

Receive one-on-one technical guidance, onsite installation and training, and lifetime support. Distributor partnerships are welcome.

Installation, Operation, and Maintenance

The unit connects via standard gas fittings and uses clear fixture guides for quick setup. Routine tasks include chamber cleaning, flame-height verification, and periodic timer checks to maintain measurement integrity.

FAQs: UL 94 Vertical/Horizontal Testing

Q: Which ratings require the 500 W burner?

A: 5VA and 5VB classifications require the 500 W burner and associated accessories.

Q: What gases can the system use?

A: Methane is typical; propane/butane may be used where applicable per the method.

Q: Can I record tests for audits?

A: Optional camera and data export features support documentation and traceability.

Resources and Downloads

Request datasheets, method cross-reference guides, and quick-start materials.

Contact UL 94 Test Apparatus Manufacturer

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