In October, 2015, Longcheng Hightech established a production line for 3000 M/Tons high-viscosity PVB per year. Its high-viscosity PVB resins are widely applied in the fields of construction laminated glass, automobile safety glass, solar photovoltaic components encapsulation film, etc.
Till now, Longcheng Hightech’s PVB resins have covered all grades from low viscosity to high viscosity.
High viscosity PVB: SD-74
| indicator | unit | SD-74 | |
| 1 | Appearance | White powder | |
| 2 | Volatile content | ％ | ≤2 |
| 3 | Acid value | mgKOH/g | ≤0.08 |
| 4 | Hydroxy content | ％ | 18-22 |
| 5 | Butyral content | ％ | 76-81 |
| 6 | Bulk density | g/m³ | 0.2-0.3 |
| 7 | Melting value | g/10min | 0.8-2.0 |
| 8 | Haze | ％ | ≤0.4 |
| 9 | Viscosity,20℃,10% | mpa.s | 700-1200 |
| 10 | Viscosity,20℃,10% | s | 80-130 |
| 11 | Yellowing test | Not turning yellow |