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Composition
AS35 insulated panels consist of a core of polyisocyanurate (PIR) insulation sandwiched between a heavily profiled external weather sheet and an internal shallow profiled liner. The PIR insulation bonds to the steel sheets during the manufacturing process, together the insulation and steel form strong, rigid panels with good thermal performance.

On one side of the panel (the ‘female’ side) the weather sheet extends beyond the insulation to permit lapping and is sealed with factory applied anti-condensation tape. Panels can be supplied with the insulation cut back at one end to enable the formation of end laps on wide span roofs.

Steel profiles
The standard external weather sheet is 0.5mm thick and the internal liner 0.4mm thick: other thickness can be supplied for special orders. The steel is either hot-dip galvanised to BS EN 10327:2004 or BS EN 10326:2004 or Aluzinc coated, then finished with one of the coatings listed in Table 03 or one of an equivalent quality.

In order to maintain our high standards of customer service we may replace the steel listed here with that of similar quality from different suppliers.

PIR insulation
AS35 panels are formed with PIR insulation which is laid down between the weather sheet and liner on the production line.

The PIR expands to a high performance insulation core and bonds to the steel facings forming a strong rigid panel. The PIR is produced with a non-ozone depleting blowing agent.

PIR has a low thermal conductivity: for a given U-value panels with PIR cores will be thinner than those with mineral wool or EPS cores. PIR can withstand higher temperature than PUR and when in contact with fire forms a surface char which limits the spread of flame.

Table 01: AS35 panel dimensions
Cover	1m
Standard lengths	1.8 – 12m (others on request)
Thickness	40, 60, 80, 100mm
Standard cutbacks	25 – 250mm (also available without cutbacks)

Table 02: AS35 panel manufacturing tolerances
Cut to length L < 3m L > 3m	+/- 5mm +/- 10mm
Cover width	-0mm / +3mm
Thickness	-2mm / +2mm
End square	-3mm / +3mm

Table 03: AS35 panel steel coatings
Weather sheet	Dobel 200XT 200 micron PVC Plastisol	A high performance pre-painted steel system on a hot dipped galvanised substrate. The outer face is finished with a leather-grain embossed PVC while the inner face is finished with a heat cured epoxy paint system.
	Dobel Nova	A 50 micron thick acrylic polymer coating which has high wear resistance, excellent colourfastness and good flexibility. The coating contains no PVC or Isocyanates and the material is wholly recyclable.
	Polyester	A polyester coating with a medium term life.
	Corus HPS200	A durable organic coating with Scintilla finish on a substrate treated with hot-dipped zinc-aluminium alloy.
	Corus and Dobel PVDF	A 27 micron thick stoved flurocarbon coating: excellent colour stability at temperatures as high as 120ºC.
Liner Sheet	White lining enamel	Single coat, 18 micron thick finish offers an easy to clean surface. Standard colour ‘bright white’.
	Dobel 200XT Plastisol	200 micron thick coating for areas with high internal humidity or a corrosive environment.
	Dobel Foodsafe	150 micron coating, suitable for the interiors of cold stores, food processing buildings and other hygiene applications.