This supporting device is a combination of bar and gird. Its main characteristics are: open rate of more than 58%, meet 1.5-2m/s high air speed requirements.
The main technical indicators of porcelain bar beams are:
| Item | Unit | Target | Standard |
| Density | g/cm3 | 2.31-2.53 | ZBG94003-86 |
| Absorption | % | <0.2<> | GB8488-87 |
| Flexural strength | Mpa | ≥45 | GB8488-87 |
| Compression strength | Mpa | ≥128 | ZBG94003-86 |
| Heat stability | 300-20℃ | Three times no crack | GB8488-87 |
Grid:
| Width(mm) | Length(mm) | Highly(mm) | Hole width(mm) |
| 200 | 200 | 120 | 45 |
| 220 | 220 | 150 | 45 |
| 220 | 120 | 120 | 45 |
| 146 | 216 | 80-100 | 35 |
Bar:
| Width(mm) | Length(mm) | Highly(mm) |
| 40.65 | ≤2500 | 150 |
| 75.80 | 180 | |
| 85 | 220 | |
| 230 | ||
| 254 |



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