Lightly corrosive environment (ORTHO)
Intergrate® ORTHO GRP gratings are produced with a high-quality patented orthophthalic polyester resin combined with a continuously woven fiberglass pattern. There are two types of ORTHO resin:
- ORTHO-NFR
- ORTHO-FR
Types of resin
When choosing the type of resin, you need to determine whether the grating must be fire-resistant. You can choose between:
- ORTHO-NFR
- ORTHO-NFR is a polyester resin that provides good protection from atmospheric corrosion. However, it is not fire-resistant. The abbreviation NFR stands for ‘Non fire-retardant’.
- ORTHO-FR
- ORTHO-FR is a polyester resin that provides good protection from atmospheric corrosion. This type of resin is also fire-resistant (high-quality fire-retardant). This type of polyester resin has a flame propagation index of 25 and a smoke index of 800 in accordance with the ASTM E-84 tunnel test. The abbreviation FR stands for ‘fire-retardant’.
Anti-slip class
As standard, all Fiberstruct GRP gratings are produced with an anti-slip class in accordance with BGR 181 and DIN 51130. The slip-resistance of surfaces is categorised in anti-slip classes. These GRP gratings satisfy anti-slip class R13 (greater than 35°, extremely high coefficient of friction).
| Class | Angle of inclination |
| R 9 | 6° - 10°, low coefficient of friction |
| R 10 | > 10° - 19°, normal coefficient of friction |
| R 11 | > 19° - 27°, good coefficient of friction |
| R 12 | > 27° - 35°, high coefficient of friction |
| R 13 | > 35°, very high coefficient of friction |
Available mesh widths
Fiberstruct GRP gratings are available in the following thicknesses and mesh widths:
|
Grating thickness (in mm) |
Grating mesh width (in mm) centre-to-centre |
Gratins mesh width inside (in mm) |
| 13 | 51 x 51 | 45 x 45 |
| 25/30/38 | 38 x 38 | 32 x 32 |
| 30/38 Micromesh | 19 x 19 | 13 x 13 |
| 51 | 51 x 51 | 43 x 43 |
RAL colours
- As standard, ORTHO-NFR GRP gratings are provided in the colour grey RAL 9006 (other colours on request).
- As standard, ORTHO-FR GRP gratings are provided in the colour grey RAL 7040 (other colours on request).
