Corus Hollow Sections and S605

Corus Tubes

Structural & Conveyance Business

Intumescent coatings &Celsius® concrete filled columns

Corus Celsius® hot finished structural

hollow sections have been subjected

to full scale 90 and 120 minute fire tests

when loaded compositely as, concrete

filled columns externally protected by

an intumescent coating. These tests

have confirmed that substantial

reductions can be made to the costs

of providing an extended fire life to

the finished column.

Minimum column size was first

established by designing the columns as

fully utilised, composite, concrete filled

hollow sections, at room temperature.

The columns were then protected with

Nullifire S605 intumescent coating.

Substantial reductions were made in the

instumescent coating dry film thickness

by taking full account of the column’s

improved ability to absorb heat due to

the presence of the concrete core.

The performance of the concrete core

had been quantified by an earlier series

of fire tests performed on a wide ranging

set of indicative SHS specimens.

The table to the right compares the

revised dry thickness in microns (µm)

of Nullifire S605 needed to provide 60

minutes fire resistance to typical sizes of

concrete filled sections with the previous

specified coating thickness, which was

based simply on the Section factor

(Hp/A) of the unfilled hollow section.

Further information on cost competitive

hollow section columns can be found in

Corus Tubes - Multi-Storey, Cost

competitive columns in structural

hollow sections.

The following tables show the reduced

coating dry film thickness that can now

be used in conjunction with Corus Tubes

Celsius® hot finished structural hollow

sections to EN 10210, filled with a

structural grade concrete and designed

as composite structural concrete filled

sections at room temperature, and

protected with Nullifire S605

intumescent coating.

Instumescent coatings &Celsius® concrete filled columns

mm 3.6 - 10.0 12.5 - 16.0 ≥20.0 3.6 - 10.0 12.5 - 16.0 ≥20.0 3.6 - 10.0 12.5 - 16.0 ≥20.0

114.3 1300

139.7 1300

168.3 900 1600

193.7 900 1300 1600 1660

219.1 750 570 610 1450 1250 1430 3250 2850 4450

244.5 750 570 610 1450 1250 1430 3250 2850 4450

273.0 750 570 610 1450 1250 1430 3250 2850 4450

323.9 400 470 570 1040 1110 1250 1930 2070 2390

355.6 400 470 570 1040 1110 1250 1930 2070 2390

406.4 400 470 570 1040 1110 1250 1930 2070 2390

457.0 400 470 570 1040 1110 1250 1930 2070 2390

508.0 400 470 570 1040 1110 1250 1930 2070 2390

610.0 400 470 570 1040 1110 1250 1930 2070 2390

660.0 400 470 570 1040 1110 1250 1930 2070 2390

Coating thickness for Nullifire S605 in microns (µm)

Size Fire resistance time: 60 min Fire resistance time: 90 min Fire resistance time: 120 min

D Thickness range min - max Thickness range min - max Thickness range min - max

168.3 x 8.0 2250 900

193.7 x 10.0 1550 900

244.5 x 6.3 3450 750

323.9 x 8.0 2250 400

Previous Previous

Size coating coating

D thickness thickness

mm µm µm

Hot finished circular hollow sections

mm 3.6 - 10.0 12.5 - 16.0 ≥20.0 3.6 - 10.0 12.5 - 16.0 ≥20.0 3.6 - 10.0 12.5 - 16.0 ≥20.0

100 x 100 1300

120 x 120 1300 1300

140 x 140 1300 1300

150 x 150 900 940 1600 1660

160 x 160 900 940 1600 1660

180 x 180 900 940 1600 1660

200 x 200 670 540 1340 1140 2800 2270

250 x 250 670 540 1340 1140 2800 2270

300 x 300 350 380 920 980 1600 1750

350 x 350 350 380 920 980 1600 1750

400 x 400 350 380 480 920 980 1100 1600 1750 2010



B x B Thickness range min - max Thickness range min - max Thickness range min - max

mm 3.6 - 10.0 12.5 - 16.0 ≥20.0 3.6 - 10.0 12.5 - 16.0 ≥20.0 3.6 - 10.0 12.5 - 16.0 ≥20.0

100 x 150 1130 1300

100 x 180 1130 1300

100 x 200 1130 1300

100 x 250 1130 1300

100 x 300 1130 1300

120 x 200 1130 1300

120 x 400 1130 1300

140 x 260 1130 1300

150 x 200 900 940 1600 1660

150 x 250 900 940 1600 1660

150 x 350 900 940 1600 1660

150 x 400 900 940 1600 1660

200 x 300 670 540 1340 1140 2800 2270

200 x 400 670 540 1340 1140 2800 2270

200 x 500 670 540 1340 1140 2800 2270

250 x 300 670 540 1340 1140 2800 2270

250 x 350 670 540 1340 1140 2800 2270

250 x 450 670 540 1340 1140 2800 2270

300 x 400 350 380 920 980 1600 1750

300 x 500 350 380 480 920 980 1100 1600 1750 2010



B x H Thickness range min - max Thickness range min - max Thickness range min - max

Hot finished square hollow sections

Hot finished rectangular hollow sections

www.corusgroup.com

Corus TubesStructural & Conveyance BusinessSales Enquiries contact:UK Sales officePO Box 6024, Weldon RoadCorby, Northants NN17 5ZNUnited KingdomT +44 (0)1536 402121F +44 (0)1536 [email protected] Helpline (UK Freephone)0500 123133 or +44 (0) 1724 405060

Corus TubesStructural & Conveyance BusinessSales Enquiries contact:Netherlands Sales officePostbus 39 4900 BB OosterhoutThe NetherlandsT +31 (0)162 482300F +31 (0)162 [email protected]

For details of Nullifire S605 contact:Nullifire Ltd.Torrington AvenueCoventryCV4 9TJ T +44 (0)247 68 55000

CT17/4:2000:UK:01/2005

Care has been taken to ensure that thisinformation is accurate, but Corus Group plc,including its subsidiaries, does not acceptresponsibility or liability for errors or informationwhich is found to be misleading

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