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).