BS EN ISO 4589-2 · ASTM D2863
Oxygen Index — OI
Measures the minimum percentage of oxygen in a test atmosphere required to marginally support combustion.
- Measures:
- Oxygen index (%)
- Markets:
- Plastics · Railway
- Related classification:
- EN 45545-2
UL 94
UL 94 Flammability of Plastic Materials
Measures flammability characteristics of plastic materials, determining 12 flame classifications for specific applications.
Tests for Flammability of Plastic Materials for Parts in Devices and Appliances
Test overview
The UL 94 tests are conducted on plastic materials to measure flammability characteristics, giving a preliminary indication of their suitability for a particular application. The tests determine 12 flame classifications of materials for specific applications.
Six of the classifications relate to materials commonly used in manufacturing enclosures, structural parts and insulators found in consumer electronic products (5VA, 5VB, V-0, V-1, V-2, HB). Three of the remaining six classifications relate to low-density foam materials commonly used in fabricating speaker grills and sound-deadening material (HBF, HF-1 and HF-2). The last three classifications are assigned to very thin films, generally not capable of supporting themselves in a horizontal position (VTM-0, VTM-1, and VTM-2), usually assigned to substrates on flexible printed circuit boards.
These tests determine the material's tendency either to extinguish or to spread the flame once the specimen has been ignited.
Sample requirements
Sample dimensions, quantities, mounting, substrate and conditioning requirements for this test are confirmed with you before testing begins. Contact our technical team for the sample requirements for your product.
Equipment and outputs
- Equipment used
- UL 94 flammability test chamber
- Reported measurements
- Flame classification (5VA, 5VB, V-0, V-1, V-2, HB, HBF, HF-1, HF-2, VTM-0, VTM-1, VTM-2)
Related tests
ASTM D7309
Microscale Combustion Calorimeter — MCC
Determines fundamental thermo-chemical data in seconds from 1–5 mg specimens and predicts fire properties of materials.
- Measures:
- Specific heat release rate (W/g) · Heat of combustion (J/g) · Ignition temperature (°C)
- Markets:
- Plastics · Aviation
Not certain whether this is the correct test for your product?
Send us a datasheet or a short description of your product and we will tell you exactly which tests apply, before any testing is booked.