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       Material Testing Instruments
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Flammability Test as per UL 94 (Semi Automatic)

Model Number: SSI 549 ULML

Standard Number: UL 94, ASTM D 635, ASTM D 408, ASTM D 3801, ASTM D 5048, IEC 60707, IEC 60695-11-10, ISO 1210, ISO 10351

The UL test serves as a preliminary indication of a plastics material acceptability for use as part of a device or appliance with respect to its flammability. The instrument is designed for both Vertical and Horizontal burning. 


Salent Feature  
Model : SSI 549 ULML (Flammability as per UL 94 with Motorized Burner Movement and LCD Display)
Chamber Size :  1 m x 1m x 1m (LBH)
Chamber Construction :  Double Walled, Inner Chamber made of Stainless Steel, Outer MS / GI
Burner :  Bunsen Burner, with adjustable flame length
Burner Position Adjustable form 0 to 90 deg (useful for  both Vertical and Horizontal Burning)
Burner Movement Automatic Controlled by Microprocessor
Sample Holder :  Provided for both Vertical and Horizontal Test
Packing : One Wooden Box
Delivery : 6 to 8 Weeks
Alternate Model : SSI 549 ULMM (Flammability Test per  UL 94 (Motorized Model))
: SSI 549 ULMH (Flammability as per UL 94 (automatic model with HMI display))


Instrument Principle

UL 94:  Test for Flammability of Plastic Materials for Parts in Devices and Appliances

This test uses specimen which is held at one end in the vertical or Horizontal  position . A burner flame is applied to the free end of the specimen for two intervals separated by the time it takes for flaming combustion to cease after the first application. Two sets of 5 specimens are tested. The following are recorded for each specimen:

  • Duration of flaming combustion after the first burner flame application.
  • Duration of flaming combustion after second burner flame application.
  • Duration of glowing combustion after second burner flame application.
  • Whether or not flaming drips ignite cotton placed below specimen.
  • Whether or not specimen burns up to holding clamp. 


The instrument is designed to conforms to various international standards 

     Horizontal Burning Test : HB (ASTM D 635, D 4804, IEC 707, or ISO 1210)

     20mm Vertical Burning Test: V-0, V-1, or V-2 (ASTM D 3801, IEC 707, or ISo 1210)

     500w (125mm) Vertical Burning: 5VA or 5VB (ASTM D 5048 or ISO 10351)


The Instrument consist of the following

     A Double Walled Chamber for sample burning with front glass door

      A Burner settable at anywhere between 0- 90o angle and precise gas control system including gas regulator

      Microprocessor  control Burner Moving system

      Sample Holding System (adjustable both vertically and horizontally)

      Digital Timer for flame application (can be preset for 1 to 99 sec)

      Digital timer for flame observation after flame is removed. 

      Digit timer for Glow observation after the flame is extinguished

      Exhaust Fan / Light in the chamber

Basic Design

      As per UL 94

      Inner Chamber Stainless Steel  1m x 1m x 1m (LBH), Volume 1 m3

      Burner  100 mm length 9.5 mm ID

      Burner Movement through a motor driven worm 

      Manual Movement to adjust the burner position with respect to sample

Microprocessor Control:

      Flame Application Time  : Pre settable from 1 to 99 Seconds

      Flame Away time : Pre Settable from  form 1 to 99 Seconds

      Cycles : Pres Settable from 1 to 9


      Adjust the burner position with respect to sample using manual burner movement.

      Manually Ignite the burner

      Set the test parameters

      Start the process. The Burner will automatically move to start point and start the flame application time.

      After Flame application time, the burner is moved back and again brought forward within the Flame away time

      After required no of cycles, the burner is automatically shut off

      The Timer for After Flame is switched On automatically. After user Hold this timer, Glow timer is switched On.