Composite Cables
Recognising the ever-increasing needs of the discerning user, the company has invested heavily in the expansion of its Plastics Extrusion Department so that it can now offer an extrusion service on a range of cables from 0.5mm to 89mm diameter. Extrusion may take the form of impregnation or complete coating, or both, and can be effected through the use of various materials - PVC, nylon, polypropylene, polyethylene, urethane, etc. The plant is capable of extrusions on core materials other than steel wire rope and strand-synthetic fibres, copper, aluminium, in fact, virtually anything which can be received in coils or on reels.

NORSELAY
'Norselay' is a composite solid section of 'herringbone' construction, either 7x7 or 7x19 galvanised high tensile carbon steel wire rope and black ultra-violet inhibited polypropylene.

The 'herringbone' construction has long been known to the wire rope industry and the effect of the opposite helix of the wires in the adjacent strands creates channels of space through to the inside of the rope enabling the polypropylene to impregnate deeply between the strands.

This produces a strong web of polypropylene locking the covering through the interstices of the rope. This feature prevents the covering from stripping off the rope in the event of damage. It also prevents capillary action and creep-corrosion from water entering the rope if damage to the covering penetrates through to the steel wires.

'Norselay' has been in use for many years as stays supporting radio antenna towers in tropical marine conditions, such as the Arabian Gulf, and was chosen to give an expected life in excess of stainless steel and other materials. It has been used by BBC, BICC, Cable & Wireless, Decca, Marconi, MOD etc. When used as yacht rigging it can also be insulated to provide an excellent aerial for transmitting and receiving.

Main advantages of Norselay

• 'Norselay is impregnated with a waterproof plastic that effectively withstands abrasion and corrosive treatment.
• It is highly resistant to acids, alkalies, and salts.
• Each individual strand in 'Norselay' is protected by a controlled thickness of plastic. There is no friction between the strands as the rope bends and flexes in use; thus the internal wear, found in other ropes is eliminated.
• As the cross-section of 'Norselay' is a dense mixture of wire and plastic, it is impossible for dirt or corrosive elements to enter or travel along the line should the outer plastic coating be cut or abraded.
• 'Norselay' never needs external greasing thereby considerably reducing maintenance costs.
• 'Norselay' marine ropes are unaffected by great depths of water. 'Norselay' mast stays resist icing because they do not absorb water through the dense wall plastic coating.

Diameter		Rope Construction	Approximate Weight per 100m	Minimum Breaking Load
Wire Rope	Overall
mm	mm		Kg	kgf
3	3.85	7 x 7	3.98	650
4	4.95	7 x 7	7.08	1100
4.7	6.10	7 x 7	9.77	1500
5	6.10	7 x 7	11.06	1800
6.5	7.80	7 x 7	18.69	3000
7	8.75	7 x 7	21.68	3600
8	9.65	7 x 7	28.32	4750
10	11.50	7 x 7	44.25	7000
12	14	7 x 7	63.72	10000
13.5	16	7 x 7	80.65	14000
16	19	7 x 7	113.28	18000
17.5	21	7 x 7	135.52	22000
19	23	7 x 7	159.00	26000
22	27	7 x 7	214.00	35000
25	31	7 x 7	278.00	45000
28	34	7 x 7	343.00	54600
32	39	7 x 19	443.00	66900
34	41	7 x 19	500.00	75500
36	44	7 x 19	560.00	84600
40	48	7 x 19	686.00	104000
44	53	7 x 19	832.00	126000

SPACELAY
With ordinary plastic coated steel wire rope, individual strands are in direct contact with each other at many points. Consequently, internal friction and wear results. Moreover, there is little or no impregnation of plastic into the rope itself which means that, if the plastic coating is cut or abraded, it will peel easily and expose the steel strands to corrosion.

In Spacelay's patented design, each individual strand is kept apart from its neighbours by the introduction of one or more extra large 'spacer-wires'. The purpose of the 'spacer-wire' is two fold: it allows full plastic impregnation so that each strand is protected by a wall of plastic and it ensures a complete bond between the inner plastic filler and the outer plastic coating.

Diameter		Rope Construction	Approximate Weight per 100m	Minimum Breaking Force
Wire Rope	Overall
mm	mm		Kg	kN
3	3.85	7 x 7	3.57	6.2
4	4.95	7 x 7	5.83	9.7
5	6.10	7 x 7	9.06	15.0
6.5	7.80	7 x 7	14.77	25.0

Main advantages of Spacelay

• 'Spacelay' is impregnated with a waterproof plastic that effectively withstands abrasion and abusive treatment.
• It is highly resistant to acids, alkalies and salts.
• Each individual strand in 'Spacelay' is protected by a wall of plastic. There is no friction between the strands as the rope bends and flexes in use; thus the internal wear, found in other ropes, is eliminated.
• As the cross-section of 'Spacelay' is a dense mixture of wire and plastic, it is impossible for dirt or corrosive elements to enter or to travel along the line should the outer plastic coating be cut or abraded.
• 'Spacelay' never needs external lubrication thereby considerably reducing maintenance costs.
• The smooth outer surface of 'Spacelay' eliminates the danger of injury due to protruding wires and lessens the possibility of damaging the surface of equipment being handled.

Brunton Shaw UK Limited Sandy Lane Worksop Nottinghamshire S80 3ES UK Tel: + 44 1909 537600 Fax: + 44 1909 500199 E-mail: info@brunton-shaw.co.uk