Moulded GRP – Lichtgitter

Moulded GRP- Gratings

Moulded GRP-gratings are produced in a negative mould. Depending on the grating type, height, pitch and bar width the appropriate mould is selected. The glass fibres are woven in a bond into the form. The number and position of the glass fibres is determined for each type. The resin mix is produced in a mixing tool. The mix consist of the following resins: isophthalic resin, colour pigments additives for fire behaviour and UV-inhibitors. The mix is then also poured into the mould, the glass fibres are pressed once more with a comb and the mould gets heated. Heating hardens the material. When the grating has cooled down, it is pressed out of the mould.

Moulded GRP-Grating – Concave

The concave garting type is origin of the moulded gratings. During the heating of the gratings a concave surface is formed on the surface of the bars. This results in a very good slip-resistance. This grating achieve the serration class R13.

GRP-gratings with a concave surface are used in areas where good chemical and weather resistance is required.

Characteristics

• high corrosion and weather resistance
• high chemical resistance
• hygienic and resistant to bacteria
• the gratings are loadbearing in the direction of the supporting rods and the crossbars
• does not conduct electricity
• low thermal diffusivity
• Anti-slip up to R13
• relatively low dead weight
• simple and quick on-site assembly
• high levels of comfort for walking and standing

Mould GRP-Gratings – Gritted

The surface of the gritted gratings is subsequently coated with corundum sand (grating type GRP-BK) or quartz sand (grating type GRP-BQ). The grit is applied subsequently with a resin.
Gratings type BK – with corundum sanding – are particularly suitable for wet areas or for areas where lubricants and oils are used. This type of grating achieves serration class R13.

The quartz sanded gratings are often used in barefoot areas such as swimming pools. This type of grating also achieves serration class R13.

Characteristics

• high corrosion and weather resistance
• high chemical resistance
• hygienic and resistant to bacteria
• the gratings are loadbearing in the direction of the supporting rods and the crossbars
• does not conduct electricity
• low thermal diffusivity
• Anti-slip up to R13
• relatively low unladen weight
• simple and quick on-site assembly
• high levels of comfort for walking and standing

Moulded GRP-Gratings – Polished

After the production process the concave surface is grinded off. After that the bars are sealed with a varnish to protect the glass fibres.
Polished gratings are used where there is a risk of injury due to concave surfaces, e.g. as fence element. This grating type achieves serration class R11.

Characteristics

• high corrosion and weather resistance
• high chemical resistance
• hygienic and resistant to bacteria
• the gratings are loadbearing in the direction of the supporting rods and the crossbars
• does not conduct electricity
• low thermal diffusivity
• Anti-slip up to R13
• relatively low unladen weight
• simple and quick on-site assembly
• high levels of comfort for walking and standing

Moulded GRP-Gratings – Closed

GRP gratings with a closed surface are gratings with a laminated GRP-Plate on top. For this purpose, the concave surface of the grating is grinded away and then the GRP plate is laminated on. The plate is usually 3 mm thick, but can be adjusted according to customer wishes and static requirements.

The plate on top of the grating can be executed with a gritted or a chequer plate surface. We recommend the gritted version, as this has better anti-slip properties than the chequer plate version.

The gratings with a closed surface type GRP-GES achieve serration class 13 and the gratings with tear plate look type GRP-TR achieve class R10.

Characteristics

• high corrosion and weather resistance
• high chemical resistance
• hygienic and resistant to bacteria
• the gratings are loadbearing in the direction of the supporting rods and the crossbars
• does not conduct electricity
• low thermal diffusivity
• Anti-slip up to R13
• relatively low unladen weight
• simple and quick on-site assembly
• high levels of comfort for walking and standing

Moulded GRP-Gratings – Sandwich

These gratings are provided with GRP plate on the surface and the bottom side of the grating. For this purpose the concave surface of the grating is grinded away and the underside is grinded for lamination connection. After that the GRP pates will be laminated to the gratings. The plate is usually 3 mm thick, but it can be adjusted according to customer wishes and statical requirements. The sandwich gratings with closed surface and bottom are better than the gratings with only closed surface when it comes to load bearing.

The gratings can be produced with a gritted plate or with a chequer plate look. We recommend the gritted version, as this has better anti-slip properties than the chequer plate version.

The gratings with a closed gritted surface, type GRP-SAND, achieve serration class 13 and the gratings with the chequer plate look, type GRP-SANDTR, achieve class R10.

Characteristics

• high corrosion and weather resistance
• high chemical resistance
• hygienic and resistant to bacteria
• the gratings are loadbearing in the direction of the supporting rods and the crossbars
• does not conduct electricity
• low thermal diffusivity
• Anti-slip up to R13
• relatively low unladen weight
• simple and quick on-site assembly
• high levels of comfort for walking and standing

Moulded GRP-Gratings – Special Designs

In addition to the known industrial application, there are many other fields of application for GRP gratings. The properties (different resins or additives) can be adapted to the intended use. For example, special resins are used for gratings in the food industry and for conductive gratings additives are added to achieve the conductivity, as GRP gratings are actually electrically insulating. In the architecture translucent and transparent GRP gratings are used. Coloured gratings are also frequently used as railing fillings or façade cladding.

Designs

• translucent and transparent GRP-gratings
• conductive GRP-gratings for explosion proof areas
• Foodgrade GRP-gratings for the food industry
• GRP gratings as fence elements
• GRP gratings for facades

For more detail information of the product, please refer to www.lichtgitter.com