Introduction to the UL 94 Vertical Burning Test

Understanding UL 94 vertical flame ratings: What they mean for polymeric materials

UL 94, the Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, is one of the most widely recognized standards for evaluating the flammability of plastic materials used in electrical, electronic and industrial applications. Through a series of small-scale laboratory tests, materials are assigned a flame classification that indicates how they behave when exposed to a controlled ignition source.

Depending on the test method, specimens are positioned either horizontally or vertically and exposed to a specified test flame under controlled conditions. The resulting classification is determined by observing factors such as burning duration, afterglow time, dripping behavior and whether burning particles ignite materials positioned below the specimen.

Among the most commonly referenced classifications are the vertical burning ratings V-0, V-1 and V-2, which indicate that a material self-extinguishes within a specified time after the ignition source is removed. These ratings also assess whether flaming drips are produced during testing.

Webinar: Introduction to the UL 94 Vertical Burning Test

Join this webinar for a practical introduction to the UL 94 Vertical Burning Test (50 W, 20 mm flame test) and learn how the burning characteristics of polymeric materials are evaluated under standardized laboratory conditions.

Through expert guidance and a live laboratory demonstration, you will gain insight into how UL 94 V classifications are determined and what test results can reveal about material performance.

What you'll learn

During this session, attendees will learn:

• How the UL 94 Vertical Burning Test is prepared and conducted, including specimen conditioning, positioning and flame application
• Which material behaviors are evaluated during testing, including afterflame time, afterglow, dripping behavior, cotton ignition and burning progression
• How test observations are used to determine V-0, V-1 or V-2 classifications and the key differences between these ratings
• Why accurate test execution and interpretation are essential, illustrated through practical examples and live testing demonstrations

Relevant standards

• UL 94, the Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances
• IEC 60695-11-10, Fire Hazard Testing — Part 11-10: Test Flames — 50 W Horizontal and Vertical Flame Test Methods (adopted in Europe as EN 60695-11-10 and nationally as DIN EN 60695-11-10 and BS EN 60695-11-10)

Whether you are involved in material selection, product development, compliance or quality assurance, this webinar will provide valuable insight into one of the most important flammability assessments used across the plastics and electronics industries.

Speakers

Arne Jansen, Engineering Technician, Global Lab Operations

Matteo Paleari, Senior Product/Service Specialist, Engineered Materials