Flammability
  Introduction
  Thermoplastics, like all organic substances, are flammable and therefore, all risks come with it must be taken into account. The materials performance against fire is determined by characteristic parameters, such as flammability, contribution to flame spread and heat evolution, and secondary phenomena of the fire, i.e. smoke density and composition of the combustion gases. These parameters are greatly influenced by factors relating to the material and its environment, such as spatial distribution, condition of the material, thermal history, thermal conductivity, type and intensity of the ignition source, duration of exposure to the ignition source, type of structure, and ventilation. Therefore, the material¡¯s performance against fire does not purely dependant upon its property..
  Standards
  UL 94 : US UL(Underwriters Laboratory)
  Flammability : 5VA > 5VB > V-0 > V-1 > V-2 > HB
  IEC 707
CSA 22.2, No.0.6 (Test A~J) : Canadian flammability requirements on electric and                                      electronic product housings
  Standard Tests
  Measurement of Burning Speed (UL 94, HB Test)
  Measurement of Burning Time (UL 94, Vertical Test)
  Measurement of an Oxygen Index
Test method (UL 94 standard)
  UL 94HB : Horizontal Burning Test
  Specimen : 5 X 1/2 ¡É X thickness (5 specimens)
  Aging conditions of the specimen : 23 ¡É , RH 50%, more than 48 hours.
  Flame is applied to the specimen for 30 seconds
 
  Certification Requirements
 
Specimen Thickness UL 94HB Requirement
3.0 ~ 3.2 mm Burning Rate < 40 mm/min
Up to 3.0 mm Burning Rate < 75 mm/min
  UL 94V : Vertical Burning Test
  Specimen : 5 X 1/2 " X thickness (5 specimens)
Aging conditions of the specimen : Identical with HB Test
  The flame is applied to the center lower edge of the specimen for 10 seconds, as shown
  below.
If burning ceases within 30 seconds, flame is re-applied for an additional 10 seconds, then
  the burning and glowing time are measured.
  Flame : Methane gas, blue, single flame, 3/4 "high
 
Certification Requirement
 
  94 V - 0 94 V - 1 94 V - 2
Burning time after each application ¡Â 10 sec ¡Â 30 sec ¡Â 30 sec
Total burning time per set of specimens (5 specimens) ¡Â 50 sec ¡Â 250 sec ¡Â 250 sec
Glowing time, seconds(individual) ¡Â 30 sec ¡Â 60 sec ¡Â 60 sec
Ignition of the cotton layer by dripping No No Yes
UL 94 5V Test (Bar Test, Plaque Test)
  Bar Test
 
     - Specimen : 5 ¡± X 1/2 ¡° X thickness
   - Aging conditions of the specimen : identical with the HB Test
   - Apply flame 1 to 5 times for 5 seconds at a time
   - Apply flame to the lower end of the specimen at an angle of 20¡£
   - Flame : double flame( inner flame : 1.5 inch / outer flame : 5 inch )
Plaque Test
   - Specimen : 6 " X 6 " X thickness
   - Aging conditions of the specimen : identical with the HB Test
   - Apply flame 1 to 5 times for 5 seconds at a time
   - Apply flame to the panel from below at an angle of 20o
   - Flame : double flame( inner flame : 1.5 inch / outer flame : 5 inch )
Certificate Requirements
 
  94 5VA 94 5VB
Burning and glowing time after the fifth application of the flame ¡Â 60 seconds ¡Â 60 seconds
Holding of plaque after application of the flame No Yes
 
 
 
Oxygen index : Minimum oxygen density required to by the combustion of plastics.
 
Resin
O.I. (%)
Resin
O.I. (%)
¥â -Fiberglass
100
P S
18.1
Teflon
95
P E
17.4
P V C
47
P P
17.4
Nylon
24~29
PMMA
17.4
PC
26~28
Paraffin
16.0