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TECHNICAL INFORMATION

LOAD DATA as per typical loading applications: Open Mesh Grating

Load Deflections are calculated over distance between Joist centres (i.e. 'Clear Spans' + thickness of joist.) (Refer A1-B1 in diagram - click to enlarge)

  

 

2.5 Kpa = Light Access Platforms & Conveyor Walkways

4.0 Kpa = Standard Australian Platform Loading

5.0 Kpa = Standard British Platform Loading

7.5 Kpa = Boiler House & Power Station Platform Loadings

(1 Kpa is equivalent to a Uniform Load of at least 100 Kgs per Square Metre.)

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NB:     [1] All dimensions in mm.

          [2] Recommended Maximum deflection for Pedestrian Comfort is 5 mm.

          [3] Envirowalk Mini-Mesh, Micro Mesh and Micro6.8 are all based on the same 40x40 main grid pattern, therefore the same load data applies through all thicknesses of H22, H30 & H40 detailed in below tables.

All specifications are based on full panels.

                                                                              FRP MOULDED GRATING 

UNIFORM LOAD TABLE Kpa:                         (Deflection in mm)

 SPAN

  MESH SIZE

HEIGHT

 2.5 Kpa

  4.0 Kpa

  5.0 Kpa

   7.5 Kpa

 

 

610

Mini-Mesh

      22

1.80

2.80

3.20

4.90

38 x 38 Square Mesh

      25

1.27

2.04

2.55

3.83

Rectangular Mesh

      25

0.9

1.35

1.62

2.43

Mini-Mesh

      30

0.65

1.05

1.35

2.15

38 x 38 Square Mesh

      38

0.45

0.57

0.82

1.22

Mini-Mesh

      40

0.39

0.50

0.68

1.14

50.7 x 50.7

      50.8

0.20

0.33

0.41

0.61

  

750

38 x 38 Square Mesh

      25

3.02

4.70

6.07

9.11

Rectangular Mesh

      25

2.10

3.40

4.20

4.90

38 x 38 Square Mesh

      30

1.40

2.60

3.90

4.50

Mini-Mesh

      30

1.34

1.92

3.20

4.15  

38 x 38 Square Mesh

      38

1.00

1.40

2.25

3.00

Mini-Mesh

      40

0.95

1.35

2.12

2.80

50.7 x 50.7

      50.8

0.65

0.90

1.30

1.80

 

914

Mini-Mesh

      30

3.22

 -

  -

  -

38 x 38 Square Mesh

      38

1.75

2.61

3.65

5.28

Mini-Mesh

      40

1.40

2.40

2.80

4.20

50.7 x 50.7

      50.8

0.91

1.45

1.82

2.73

 

1000

38 x 38 Square Mesh

      38

2.45

3.80

4.80

  -

Mini-Mesh

      40

2.02

3.23

4.10

  -

50.7 x 50.7

      50.8

1.37

2.19

2.73

4.10

1219

50.7 x 50.7

      50.8

2.81

4.49

  -

  -

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CONCENTRATED POINT LOAD TABLE Kgs:     (Deflection in mm)

 SPAN

  MESH SIZE

HEIGHT

200

400

600

800

 1000 1500

  

457

 

Mini-Mesh

      22

2.20

4.20

-

-

 - -

38 x 38 Square Mesh

      25

1.75

3.35

5.01

6.70

 8.24 -

Rectangular Mesh

      25

1.45

2.72

3.85

5.15

 6.50 -

Mini-Mesh

      30

1.25

2.70

3.90

5.20

 6.50 -

38 x 38 Square Mesh

      38

0.7

1.20

1.78

2.30

 2.90 4.10

Mini-Mesh

      40

0.65

1.14

1.71

2.25

 2.80 4.15

50.7 x 50.7

      50.8

0.41

0.72

1.02

1.28

 1.70 2.30

  

610

Mini-Mesh

      22

4.50

-

-

-

 - -

38 x 38 Square Mesh

      25

3.63

-

-

-

 - -

Rectangular Mesh

      25

2.94

-

-

-

 - -

Mini-Mesh

      30

2.05

4.07

-

-

 - -

38 x 38 Square Mesh

      38

1.25

2.29

3.05

4.19

 5.00 7.60

Mini-Mesh

      40

0.99

1.88

2.84

3.82

 4.30 6.48

50.7 x 50.7

      50.8

0.58

1.10

1.57

2.08

 2.70 3.95

 

750

Rectangular Mesh

      25

5.85

-

-

-

 - -

38 x 38 Square Mesh

      30

4.15

-

-

-

 - -

Mini-Mesh

      30

3.92

-

-

-

 - -

38 x 38 Square Mesh

      38

2.15

4.30

6.21

-

 - -

Mini-Mesh

      40

1.91

3.72

5.58

-

 - -

50.7 x 50.7

      50.8

1.31

2.55

3.85

-

 - -

 

914

Mini-Mesh

      30

5.21

-

-

-

 - -

38 x 38 Square Mesh

      38

2.63

5.61

-

-

 - -

Mini-Mesh

      40

2.42

4.83

-

-

 - -

50.7 x 50.7

      50.8

1.41

2.72

4.20

5.82

 6.95 10.42

 

1000

38 x 38 Square Mesh

      38

3.55

-

-

-

 - -

Mini-Mesh

      40

3.35

6.05

-

-

 - -

50.7 x 50.7

      50.8

1.98

3.35

4.98

-

 - -

1219

50.7 x 50.7

      50.8

2.65

5.45

-

-

 - -

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LOAD DATA: Grating with Covered Top

(Deflection in mm)

UNIFORM LOAD TABLE: COVER TOP GRATING

Type

Span

2.5 kpa

4.0 kpa

5.0 kpa

7.5 kpa

H38+3

600

0.16

0.25

0.32

0.48

1000

1.2

2.0

2.5

3.7

1200

2.5

4.1

5.1

-

1400

4.7

7.5

-

-

 

H38+5

600

0.13

0.2

0.25

0.38

1000

1.0

1.6

1.9

2.9

1200

2.0

3.2

4.0

6.0

1400

3.7

6.0

7.4

-

 

H50+3

600

0.09

0.14

0.17

0.26

1000

0.7

1.1

1.3

2.0

1200

1.4

2.2

2.8

4.1

1400

2.6

4.1

5.1

7.7

 

H50+5

600

0.07

0.11

0.14

0.21

1000

0.5

0.9

1.1

1.6

1200

1.1

1.8

2.2

3.3

1400

2.1

3.3

4.1

6.2

NB: PRODUCT CODES FOR COVERED TOP GRATING:

To calculate the Product Code for a specified product please affix the Dimensions as noted in the Height column to EnviroCT: (e.g. A 38+5 mm high Grating read as: EnviroCT38+5)

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CORROSION RESISTANCE DATA

                      Corrosion Resistance Guide for Moulded Grating

RESIN:

            Type V

            Type I

            Type O

Chemical Type

Concentration
%

Temperature
F/¡æ

Concentration
%

Temperature
F/¡æ

Concentration
%

Temperature
F/¡æ

Acetic Acid

50

180/82

50

125/52

5

77/25

Aluminium Hydroxide

100

180/82

100

160/71

ALL

-

Ammonium Chloride

ALL

210/99

ALL

170/77

ALL

-

Ammonium Bicarbonate

50

160/70

15

125/52

ALL

-

Methacrylic Acid

99

95/35

-

-

-

-

Ammonium Hydroxide

28

100/38

28

N/R

ALL

N/R

Ammonium Sulphate

ALL

210/99

ALL

170/77

ALL

-

Benzene

100

92/40

ALL

N/R

ALL

N/R

Benzoic Acid

SAT

210/99

SAT

150/66

ALL

77/25

Borax

SAT

210/99

SAT

170/77

SAT

113/45

Calcium Carbide

ALL

180/82

ALL

170/77

ALL

-

Calcium Nitrate

ALL

210/99

ALL

180/82

ALL

-

Carbon Tetrachloride

100

92/40

100

N/R

100

N/R

Chlorine, Dry Gas

-

210/99

-

140/60

-

N/R

Chlorine Water

SAT

200/93

SAT

80/27

SAT

N/R

Chromic Acid

10

150/65

5

70/21

5

N/R

Citric Acid

ALL

210/99

ALL

170/77

ALL

77/25

Calcium Chloride

ALL

210/99

ALL

170/77

ALL

104/40

Copper Cyanide

ALL

210/99

ALL

170/77

ALL

77/25

Copper Nitrate

ALL

210/99

ALL

170/77

ALL

-

Ethanol

10

155/82

50

75/24

10

77/25

Ethylene Glycol

100

200/93

100

90/32

100

104/40

Hydrofluoric Acid

10

149/65

-

-

-

-

Ferric Chloride

ALL

210/99

ALL

170/77

ALL

104/40

Ferrous Chloride

ALL

210/99

ALL

170/77

ALL

86/30

Formaldehyde

37

140/60

50

75/24

25

86/30

Gasoline

100

180/82

100

75/24

100

95/35

Glucose

100

210/99

100

170/77

ALL

-

Glycerine

100

210/99

100

150/66

100

-

Hydrobromic Acid

50

150/65

50

120/49

18

-

Hydrochloric Acid

37

150/65

37

75/24

10

86/30

Hydrogen Peroxide

30

150/65

5

100/38

5

N/R

Lactic Acid

ALL

210/99

ALL

170/77

ALL

77/25

Lithium Chloride

SAT

210/99

SAT

150/66

ALL

-

Magnesium Chloride

ALL

210/99

ALL

170/77

ALL

104/40

Magnesium Nitrate

ALL

210/99

ALL

140/60

ALL

86/30

Magnesium Sulphate

ALL

210/99

ALL

170/77

ALL

104/40

Mercuric Chloride

100

210/99

100

150/66

100

104/40

Mercurous Chloride

ALL

210/99

ALL

140/60

ALL

104/40

Nickel Chloride

ALL

210/99

ALL

170/77

ALL

104/40

Nickel Sulphate

ALL

210/99

ALL

170/77

ALL

104/40

Nitric Acid

20

130/54

20

70/21

20

N/R

Oxalic Acid

ALL

210/99

ALL

75/24

ALL

N/R

Perchloric Acid

30

100/38

10

N/R

10

N/R

Phosphoric Acid

100

210/99

100

120/49

80

N/R

Potassium Chloride

ALL

210/99

ALL

170/77

ALL

104/40

Potassium Dichromate

ALL

210/99

ALL

170/77

ALL

77/25

Potassium Nitrate

ALL

210/99

ALL

170/77

ALL

104/40

Potassium Sulphate

ALL

210/99

ALL

170/77

ALL

104/40

Propylene Glycol

ALL

210/99

ALL

170/77

ALL

104/40

Sodium Acetate

ALL

210/99

ALL

160/71

ALL

104/40

Sodium Bisulphate

ALL

210/99

ALL

170/77

ALL

-

Sodium Bromide

ALL

210/99

ALL

170/77

5

-

Sodium Cyanide

ALL

210/99

ALL

170/77

5

N/R

Sodium Hydroxide

25

180/82

N/R

N/R

N/R

N/R

Sodium Nitrate

ALL

210/99

ALL

170/77

ALL

104/40

Sodium Sulphate

ALL

210/99

ALL

170/77

ALL

104/40

Stannic Chloride

ALL

210/99

ALL

160/71

ALL

104/40

Sulphuric Acid

50

183/80

25

75/24

10

-

Tartaric Acid

ALL

210/99

ALL

170/77

ALL

-

Vinegar

100

210/99

100

170/77

ALL

-

Methanol

10

183/84

N/R

N/R

N/R

N/R

Sea Water

ALL

210/99

ALL

158/70

ALL

113/45

Distilled Water

100

180/82

100

170/77

ALL

86/30

Zine Nitrate

ALL

210/99

ALL

170/77

ALL

104/40

Zine Sulphate

ALL

210/99

ALL

170/77

ALL

104/40

Remarks:

 1.      ALL refers to any concentration, SAT refers to saturated solution, N/R means not recommended and ¨C means no information is available.
2.     Tests from resin manufacturers and experiences indicate that the resin can withstand the corrosion conditions listed above. And the corrosion resistance data listed above is just for reference since the real environments are beyond control.
3. If products are used in other environments not mentioned above, please contact us.

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INSTALLERS

S.A. & L.E. Graham  ABN: 19 779335903

Metal Fabrication and General Construction

Manufacturer of JEKAMS Equipment

Contact:  Stewart Graham

2 ELM Rd, Wagga Wagga, NSW  2650

Phone: (02) 6922 5819         Fax: (02) 69225818

Mobile: 0417 669 375

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Stewart Graham is a Preferred Builder & Installation expert of Envirowalk FRP Grating at the Minnamurra Rainforest Centre near Wollongong in the     Illawarra Region (Please see photos on Home Page of this web site.) Stewart was also responsible for fabrication of the structure for the fabulous lookout at Granite Falls, NSW (See Photos below)
            

Working from the Murray to Wollongong and Beyond!

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CUTTING AND INSTALLATION

 

Cutting FRP grating is so much easier than cutting steel or alloys. It can be performed on site with ease provided you have the facilities to use power tools - Even a hand held hacksaw can be used if necessary!

Although the dust from FRP grating is low toxic, as with any cutting situation that may create a dust problem, it is important to wear dust protective clothing and equipment such as dust masks.

bullet Some of the tools commonly used to cut and smooth FRP Grating.
 
bullet

Dust Protection:    Even though it has a very low toxic content, cutting FRP products creates a very fine dust and it is recommended to use full face dust protection similar to that shown here.

 
bullet

Diamond Tip cutting blade:    To suit a circular saw and/or an angle grinder as shown in the images  below. Although a segmented blade is shown and may be used, Envirowalk prefers to recommend the continuous turbo rim cutting blade.

 

bullet Circular Saw:    A saw requiring a 184mm blade should service most requirements. Best to use a wet saw where possible to minimize dust cloud.
 
bulletReciprocating Saw with Masonry blade or Jigsaw with ceramic blade (The latter for mesh less than 30mm thick)
 
bullet

Angle Grinder:    It is advisable to have two: a small (115mm) and a larger (180mm)                        

 
bulletStraight Edge Guide:    This is important when cutting diagonally across panels: It will help prevent the saw or grinder 'kicking' off line.
 
bulletSmall sanding grinder:    With a 40 grit Metal Flap disc, this can be used to clean off cut edges.
 
bullet

Small Paint Roller:    Using disposable roller sleeves. In areas of high corrosion it is advisable to apply a thin coating of resin/Gelcoat to the exposed edges as added protection. The resin/sealer may also be brushed on if preferred.

 

NB:     A coarse bladed hacksaw can also be useful to trim off any undesired protrusions of load bars.

 

EnviroTread  EnviroTread  HELPFUL HINTS  EnviroTread  EnviroTread

When placing panels over a slight hump or change in angle in gradient that requires the panel to bend downward, it may be possible to take advantage of the flexibility of FRP by cutting a wedge groove on the underside of the panel to allow the panel to conform to the required shape without excessive resistance. This reduces the number of joining gaps.

The following pictures illustrate the cutting for corners and cut-outs.

             

When panels are cut evenly through the axis of change in direction Mini-Mesh is ideal as the load bars match up and the resulting odd shape apertures do not detract from it's aesthetic appearance.

NB: Although edge bars can be bonded to the cut edges of panels it is not recommended as they do tend to come loose in a relatively short period of time: Bonding FRP edge bars does not have same strength as welding steel to steel.

  

Another means of changing direction is to use cover (solid) top panels of equal thickness cut to wedge shapes: The Lake Thetis walkway used 30mm thick (H30) 38x38 grid mesh in conjunction with 25+5 cover top (i.e. H25 Mesh with 5mm flat plate bonded to the surface and with grit anti-slip surface.)

 

Cut outs around trees, rocks, or other obstacles is best performed by using a reciprocating saw with masonry blade for panels more than 25mm thick or a jig saw with ceramic blade for panels up to 25mm thickness.

 

 

Round off cut edges to aid against injuries. To do this we recommend using a 40 grit metal flap disc in a 127mm diametre grinder. Only light pressure should be used when doing this.

 

 

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When kickboards are required along the top edges of walkways it is possible to insert a Standard Mesh Type M Clip from the underside as shown in photo illustration. The fastener Bolt/Screw would then be secured in a cavity that would reduce the risk of tampering. (In the case of Mini-Mesh Grating it would be necessary to either pre-drill the infill bars or use a suitable self-tapping fastener.)

The hole diameter in the Standard Mesh Clip is 8.5 mm

.

 

 CONTACT US

 

 
Envirowalk Pty Ltd   ABN: 29 141844671
13 Katrina St
Lake Heights
NSW   2502
Phone:      61 (0)2 42 741 563  or  61 (0)2 42 749 888
Mobile:     Lee: 0412 534 204    Grahame: 0407 778 940               EnviroTread  EnviroTread EnviroTread  EnviroTread
Direct initial enquiries to:  envirowalk@optusnet.com.au
 
NB:  Envirowalk supplies direct throughout Australia from our Campbelltown and Wollongong locations.
Last modified: 23-07-2022

While Envirowalk Pty Ltd has taken all reasonable care in the preparation of this Website, it takes no responsibility for any loss that may result from relying on its contents. Customers are advised to make their own enquiries as to whether any products described within this website are suitable for their intended use. Information contained in this Website may vary without notice.

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