Molded FRP grating is manufactured in an open, heated mold system. Continuous roving is laid in the mold in alternating layers and completely wet out with resins. This continuous process produces an integral plate which provides good performance of excellent corrosion resistance and bi-directional strength.
Resin Types
Resin Code |
Description |
Resin Base |
Corrosion Resistance |
Flame Spread ASTM E84 |
Max. Oper. Temp |
MP-5 |
Low Smoke, Superior Fire Resistance |
Phenolic Resin |
Very Good |
Class 1, 05 or Less |
180°C (356°F) |
VE-25 |
Chemical Proof, Extra Fire Retardant |
Vinyl Ester |
Excellent |
Class 1, 25 or Less |
-60°C~120°C |
VE-10 |
Chemical Proof, Extra Fire Retardant |
Vinyl Ester |
Excellent |
Class 1, 10 or Less |
-60°C~120°C |
ISO-25 |
Industrial Grade, Fire Retardant |
Isophthalic |
Very Good |
Class 1, 25 or Less |
-60°C~105°C |
ISO-30 |
Food Grade, Fire Retardant |
Isophthalic |
Very Good |
Class 1, 30 or Less |
-60°C~105°C |
OR-25 |
Architectual Grade, Fire Retardant |
Orthophthalic |
Good |
Class 1, 25 or Less |
-60°C~70°C |
Items |
Line Load Deflection |
Uniform Load Deflection |
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38*38*25 |
38x38x25mm-Mesh Size:38x38mm, Thickness 25mm, Open Rate 68%, Weight 12.3Kg/m2. |
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Deflection Span (mm) |
Kg/m |
Break Point |
Kg/m |
|||||||||||
|
75 |
150 |
300 |
450 |
600 |
750 |
|
240 |
480 |
980 |
1450 |
2450 |
3650 |
4880 |
|
|
450 |
0.559 |
1.146 |
2.159 |
3.075 |
4.115 |
4.749 |
3910 |
0.660 |
1.092 |
1.930 |
2.769 |
4.470 |
6.579 |
---- |
|
600 |
0.864 |
1.702 |
3.505 |
5.156 |
6.706 |
8.179 |
2924 |
1.118 |
2.108 |
4.140 |
6.172 |
10.21 |
15.26 |
---- |
|
750 |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
2.667 |
5.387 |
10.82 |
16.28 |
---- |
---- |
---- |
|
900 |
2.896 |
5.918 |
12.12 |
18.44 |
---- |
---- |
1948 |
5.537 |
11.18 |
21.72 |
---- |
---- |
---- |
---- |
|
1200 |
5.715 |
111.6 |
---- |
---- |
---- |
---- |
1461 |
---- |
---- |
---- |
---- |
---- |
---- |
---- |
38*38*30 |
38x38x30mm-Mesh Size:38x38mm, Thickness 30mm, Open Rate 68%, Weight 14.6Kg/m2. |
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Deflection Span (mm) |
Kg/m | Break Point |
Kg/m |
Break Point |
||||||||||
|
75 |
150 |
300 |
450 |
750 |
1500 |
|
350 |
500 |
750 |
1000 |
1500 |
2500 |
|
|
|
300 |
<.25 |
<.25 |
0.254 |
0.508 |
0.762 |
1.524 |
9923.4 |
<.25 |
<.25 |
<.25 |
<.25 |
0.254 |
0.508 |
32500 |
|
450 |
0.254 |
0.508 |
1.016 |
1.524 |
2.540 |
---- |
4827.6 |
0.254 |
0.508 |
0.762 |
1.016 |
1.524 |
2.286 |
21661 |
|
600 |
0.508 |
1.270 |
2.286 |
3.556 |
5.842 |
---- |
4112.4 |
1.060 |
1.524 |
2.286 |
2.794 |
4.318 |
7.366 |
12980 |
|
750 |
1.270 |
2.540 |
4.826 |
7.366 |
12.45 |
---- |
3173.7 |
2.540 |
3.810 |
5.842 |
7.620 |
11.68 |
---- |
8296 |
|
900 |
1.778 |
3.810 |
7.620 |
11.43 |
---- |
---- |
2637.3 |
4.572 |
7.112 |
10.66 |
---- |
---- |
---- |
5758 |
38*38*38 |
38x38x38mm-Mesh Size:38x38mm, Thickness 38mm, Open Rate 68%, Weight 19.5Kg/m2. |
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Deflection Span (mm) |
Kg/m |
Break Point |
Kg/m |
|||||||||||
|
75 |
150 |
300 |
450 |
600 |
750 |
|
240 |
480 |
980 |
1450 |
2450 |
3650 |
4880 |
|
|
300 |
0.279 |
0.356 |
0.483 |
0.610 |
0.762 |
0.889 |
17116 |
0.254 |
0.305 |
0.381 |
0.457 |
0.635 |
0.838 |
---- |
|
600 |
0.365 |
0.660 |
1.245 |
1.850 |
2.464 |
3.073 |
8718 |
0.432 |
0.813 |
1.549 |
2.311 |
3.835 |
5.740 |
---- |
|
900 |
0.864 |
1.803 |
3.683 |
5.563 |
7.417 |
9.296 |
5817 |
1.702 |
3.454 |
6.959 |
10.46 |
17.47 |
---- |
---- |
|
1200 |
2.261 |
4.749 |
9.677 |
14.63 |
19.58 |
---- |
3755 |
5.969 |
12.16 |
24.51 |
---- |
---- |
---- |
---- |
50*50*50 |
50x50x50mm-Mesh Size:50x50mm, Thickness 50mm, Open Rate 78%, Weight 23.5Kg/m2. |
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Deflection Span (mm) |
Kg/m |
Break Point |
Kg/m |
|||||||||||
|
75 |
150 |
300 |
450 |
600 |
750 |
|
240 |
480 |
980 |
1450 |
2450 |
3650 |
4880 |
|
|
300 |
0.279 |
0.305 |
0.406 |
0.483 |
0.635 |
1.041 |
21727 |
0.254 |
0.279 |
0.330 |
0.381 |
0.483 |
0.737 |
---- |
|
600 |
0.356 |
0.508 |
0.813 |
1.128 |
1.753 |
3.327 |
11713 |
0.381 |
0.584 |
0.965 |
1.372 |
2.134 |
4.115 |
---- |
|
900 |
0.508 |
1.118 |
2.235 |
3.200 |
5.156 |
10.05 |
7780 |
1.194 |
2.108 |
3.937 |
5.766 |
9.449 |
18.59 |
---- |
|
1200 |
0.914 |
1.930 |
3.937 |
5.918 |
9.957 |
---- |
5834 |
2.413 |
4.928 |
9.957 |
14.96 |
---- |
---- |
---- |
*Smaller sizes can be made by cutting from original gratings.
|
Thickness (mm) |
Grid (mm) |
W x H (mm) |
Load (ton) |
Weight (kg/㎡) |
|
25 |
38×38 40×40 |
1220*2440 |
1 |
12.7 |
|
1220*3660 |
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|
1007*4007 |
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|
30 |
38×38 40×40 |
1220*2440 |
2 |
15.5 |
|
1220*3660 |
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|
1007*4007 |
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|
38 |
38×38 40×40 |
1220*2440 |
3 |
19.5 |
|
1220*3660 |
||||
|
1007*4007 |
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|
50 |
38×38 50×50 |
1220*2440 |
5 |
23.5 |
|
1220*3660 |
||||
|
1007*4007 |
||||
|
65 |
50×50 |
1220*3660 |
8 |
30 |
|
25 |
12×12 19×19 |
1220*2440 |
1 |
16.6 |
|
1220*3660 |
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|
1007*4007 |
||||
|
30 |
12×12 19×19 |
1220*2440 |
3 |
18.6 |
|
1220*3660 |
||||
|
1007*4007 |
||||
|
38 |
12×12 19×19 |
1220*2440 |
6 |
23.7 |
|
1220*3660 |
||||
|
1007*4007 |
||||
|
50 |
19×19 |
1220*2440 |
3 |
22 |
|
1220*3660 |
||||
|
1007*4007 |
FRP grating offers several advantages over traditional materials such as steel or aluminum grating. Let's compare FRP grating with these materials based on various factors:
Corrosion Resistance: While steel or aluminum grating can corrode over time when exposed to moisture or chemicals, FRP grating exhibits exceptional corrosion resistance. It does not rust or corrode, making it suitable for applications in corrosive environments.
Weight: FRP grating is significantly lighter than steel or aluminum grating. This weight reduction makes it easier to handle, transport, and install while reducing the load on supporting structures.
Strength: Steel grating offers high strength but is susceptible to corrosion. Aluminum grating provides moderate strength but may not be suitable for heavy-duty applications. FRP grating offers comparable strength to steel or aluminum grating while being corrosion-resistant.
Slip Resistance: While steel or aluminum grating may become slippery when wet or oily, FRP grating can be made with a gritted surface that provides excellent slip resistance even in such conditions.
Electrical Conductivity: Steel and aluminum are conductive materials, which may pose risks in electrical environments. In contrast, FRP grating is non-conductive, making it suitable for use in areas where electrical conductivity needs to be minimized or eliminated.
Maintenance: Steel or aluminum grating requires regular maintenance to prevent corrosion or degradation. FRP grating requires minimal maintenance due to its corrosion resistance.
Cost: The cost of FRP grating may be higher upfront compared to steel or aluminum grating. However, considering the reduced maintenance requirements and longer lifespan of FRP grating, it can offer cost savings over time.
FRP grating finds applications in various industries due to its unique properties and advantages. Some common applications include:
Industrial Flooring: FRP grating is widely used as flooring in industrial settings such as factories, warehouses, and manufacturing plants. Its slip-resistant surface provides a safe working environment for employees, even in wet or oily conditions. The corrosion resistance of FRP grating makes it suitable for areas where exposure to chemicals or corrosive substances is expected.
Walkways and Platforms: FRP grating is commonly used for walkways and platforms in both industrial and commercial settings. Its lightweight nature makes it easy to install and transport while providing a safe and sturdy surface for pedestrians.
Marine and Offshore: FRP grating is extensively used in marine and offshore applications due to its corrosion resistance and durability in harsh saltwater environments. It can be found on docks, piers, decks, and offshore platforms.
Water and Wastewater Treatment: FRP grating is an ideal choice for water and wastewater treatment facilities due to its corrosion resistance and ability to withstand exposure to chemicals and moisture. It is used in areas such as walkways, catwalks, stair treads, and trench covers.
Chemical Processing: The chemical resistance of FRP grating makes it suitable for use in chemical processing plants where exposure to corrosive chemicals is prevalent. It can be found in areas such as chemical storage areas, processing floors, and tank platforms.
Food and Beverage Industry: FRP grating is used in the food and beverage industry due to its hygienic properties and resistance to chemicals commonly used in food processing facilities. It can be found in areas such as production floors, walk-in freezers, and washdown areas.
Transportation Infrastructure: FRP grating is increasingly being used in transportation infrastructure projects such as bridges, tunnels, and railway platforms. Its lightweight nature reduces the load on the structure while providing a durable and non-slip surface for pedestrians or vehicles.
A. Selection of raw materials
The raw materials used for FRP gratin are resin, FRP fiber wire, and calcium powder as filler in a ratio of 1:1:1. High-quality FRP gratings are made of high-quality resin: unsaturated phthalic resin 196, colorless and transparent . Low viscosity, low exotherm, low shrinkage, high speed curing, high speed compatibility, bright gloss. The produced FRP grating is flat and smooth, with good gloss, high strength and certain toughness. If you use inferior resin, it will be completely opposite. The inferior resin is cloudy, high viscosity, high exotherm, high shrinkage, relatively slow curing, and poor compatibility. Toughness is not good.
In the FRP grating, the toughness of the grating can be enhanced by the FRP fiber wire. High-quality fiberglass fiber such as alkali-free fiberglass fiber has a certain toughness, chemical stability, good weather resistance, almost no water absorption and no fire, and its high strength can also be used as tire cord.
The filler of FRP grating is calcium powder or aluminum powder. The high-quality filler is fine and white, has flame retardancy, and is completely integrated with the resin. The produced board has a beautiful color, good transparency and high toughness. On the contrary, the inferior filler is rough and dull in quality, not flame retardant, and the produced board has no gloss and is relatively brittle and inflexible.
B. Comparison of finished products
High-quality FRP grating products have no obvious cracks in appearance, fewer pores, bright and pure colors, good transparency, certain toughness, high strength, good surface finish, and long service life; while inferior FRP grating products have cracks in appearance, There are many pores, and the color is not pure and the gloss is not enough. Its service life is also shorter.
Although FRP grating can not completely replace steel grating, it completely makes up for the conditions or fields that steel grating cannot meet. It fully reduces the non-capacity burden of steel grating, and also provides another solution for people to solve the problem. Its appearance has become a powerful complement to steel grating.
The selection of suitable FRP grating should be considered from the purpose of use, application environment, size and other aspects.
1. It is necessary to determine what the FRP grating is used for, that is, to clarify its purpose of use. For example, the manufacturer of the car wash buys FRP gratings as the carrier plate for car washing purposes.
2. After determining the purpose of the FRP grating, it is time to determine the size and specification of the grating used. Through the relevant introduction of the manufacturer, you can have a general understanding of the grille. For example, in the car wash, you can choose a 2.5cm thick grille or a 3.8cm thick grille. In the electroplating equipment factory, the commonly used grid plate is 2.5cm thick. In sewage treatment plants and chemical plants, grid plates with a thickness of 3.8 cm are often used.
3. After selecting the appropriate thickness of the FRP grating, it is necessary to calculate the size of the grating in use. Like in a car wash. The size of a car wash space is mostly 1.220m*2.440m, while the size of the FRP grille is 1.220*3.660, which needs to be cut before it can be put into use.
4. Select suitable raw materials to make FRP gratings that meet the requirements. For example, gratings used in chemical plants or sewage treatment plants, it is necessary to select resins with higher corrosion resistance for production.
The following should be noted in the process of using FRP grating.
1. Due to the low density and light material, the installation of FRP grid grids is easy to float in areas with high groundwater levels, and anti-floating measures such as piers or rainwater runoff must be considered.
2. In the construction of opening tee on the installed FRP grating, repairing pipeline cracks, etc., it requires completely dry conditions similar to those in the workshop, and the resin and fiber cloth used in the construction need to be cured for 7-8 hours. Patching is generally difficult to meet this requirement.
3. The existing underground pipeline detection equipment mainly detects metal pipelines, and the non-metal pipeline detection instruments are expensive, so the FRP grille cannot be detected after being buried in the ground, and other subsequent construction units are very easy to dig and damage the pipeline during construction.
4. The anti-ultraviolet ability of FRP grille is poor. The surface-mounted FRP grating delays the aging time by making a 0.5mm thick resin-rich layer and UV absorber (processed in the factory) on its surface. Over time, the resin-rich layer and UV absorber are damaged and their service life is affected