Single Burning Item Test (SBI)
Classification based on single burning test
| Building material class | designation | ||
| Class A | A1 | Non-combustible materials | |
| A2 | |||
| Class B | PIR | B1 | hard flammable |
| PUR | B2 | NOT easily flammable | |
| B3 | Easily flammable | ||
| Burning Characteristics Of Polyurethane Foam | |||
| Properties | Class A,B1 | Class B2 | Class B3 |
| Exposure time | 60 second | 60 second | 60 second |
| Ignitability | No ignitable | Normally ignitable | Easily ignitable |
| Flammability | Nonflammable | Hard Flammable | Highly flammable |
| Burning rate | 0.1 mm/s | 1.0 mm/s | 2.5 mm/s |
| Flame spread | No flame spread | No flame spread | Fast spread |
| Weight loss | 21 percent | 42 percent | 100 percent |
| Melting | No melting | No melting | melting |
| Dripping | No dripping | No dripping | dripping |
| Burn length | Charred up to 7 mm | Charred up to 15 mm | Burning entire length |
NOTE THAT:
- The mentioned above characteristics is belong to foam only.
- Cladding foam with metal face upgrade the foam class to a higher level of fire classification class starting from B2 Class i.e.; (B2 class react the same characteristics of B1 Class).
- All mechanical and fire behavior properties is directly proportional to the thickness of foam.
FM Approval Standards According to ASTM
FM 4882 approval and test options
| 4471 | Class 1 Panel Roofs |
| 4880 | Class 1 Insulated Wall and Ceiling Panels – Fire |
| 4881 | Class 1 Exterior Wall systems |
| 4882 | Class 1 Interior Wall and ceiling systems – Smoke Sensitive occupancies |
| Cleanrooms | Pharmaceutical, food prep. & others | |
|---|---|---|
| Test Method | ||
| Class1 | 4880 Approval ht | 4880 Approval ht |
| Fire Propagation Index FPI Or 8ft Parallel panel test (60kW) [FM4910] | ≤ 6(m/s1/2)/(kW/m)2/3 or Propagation ≤ 6ft Max heat flux @4ft ≤ 40 kW/m² Chemical heat release rate decay ≥1/2 @1min. & decay ≤ 25% @2min | |
| Smoke Development Index SDI or 8ft Parallel panel test (60kW) [FM4910] | ≤ 0.4 [(m/s1/2)/(kW/m)2/3] [g/g] or Max. smoke generation ≤ 0.23g/s Smoke generation @12min ≤ 0.07g/s Total smoke generation ≤ 60g | |
| Avg Smoke emission rate Gsmoke 16ft parallel panel test (360 kW) | ≤ 120mg/s | ≤ 240mg/s |
| ASTM E84 Flame spread index FSI Smoke Developed Index SDI | ≤ 25 ≤ 450 | ≤ 25 ≤ 450 |