Introduction:

Alfas C'Seal is a neoprene and resin impregnated foam sealant strip which when used under compression by 80% provides a high performance weather seal. The product is supplied in rolls pre-compressed by approx. 85% of the expanded thickness. The self-adhesive backing is exposed and the material is placed into position where it expands to find its own level and to create a permanent elastic seal. Alfas C'Seal maintains flexibility throughout its life and responds to continual expansion and contraction cycles caused by thermal movement.

Applications in the construction industry:

Expansion joints, joints for thermal movement or differential settlement, seals for cladding, maintenance free seals around windows and door frames, joints for porches, conservatories and canopies to stone or brickwork, seals on side laps and end laps for roofing and cladding, joints on roof lights and glazing structures, tunnelling and guttering, seals for ductwork and air conditioning, joints for potable or sectional buildings.

Other industries:
Joints in the construction of railway carriages, aircraft, ships, motor vehicles, containers, refrigeration plant.

DESCRIPTION:

Composition, Manufacture:
C'Seal is manufactured using a specialist polyester foam carrier, the cellular structure of which is impregnated with an amalgam of neoprene and liquid plastic. The foam acts like a spring and exerts a continuous outward pressure when compressed whilst yielding to further compression. The foam is saturated with a reacted mixture based on neoprene and inert liquid resin which is keyed into reticulated foam cells. As the strip is compressed, the cells close, thus providing a weather seal at 80% compression. For less severe situations, the degree of compression may be reduced. The impregnated foam is adhered onto a self-adhesive carrier which is protected by a release paper backing. This adhesive face is provided to aid fixing. The product is supplied in rolls to the required size.

Shape, Dimensions:

C'seal is generally sold in standard thicknesses and roll lengths (although special sizes can be produced against minimum quantities). These are cut to any width (self-adhesive face) to suit each project.

Weather resistance:

When compressed by 80% of its original thickness C'seal will resist the ingress of driving rain; When compressed by 85%, It will resist sprayed water up to a pressure of 400 pa.

Heat:

C'seal is stable between the range -30 dg c. and +35 dg c. the material will endure short periods at -45 dg c to 100 dg c. the flexibility of the material is reduced at sub- zero temperatures. The material will not bleed, stain or dis-colour surrounding material at up to 85 dg c and under standard compression ratios. Co-efficient of thermal conductivity: 0.055kcal/m/hr dgc when fully compressed.

fire:

The material, under compression, is flame retardent and classed as self-extinguishing.

Light:

C'seal has excellent resistance to ultra violet rays when compressed by 80%.

Durability:

When correctly installed, C'seal has a life expectancy in excess of 25 years.

Chemical:

Unaffected by most chemicals present in building materials. C'seal is compatible with most mastics and finishing materials such as paints which should if required have similar elastic properties. The product offers good resistance to dilute acids and alkalis but contact should be avoided with certain solvents (consult our technical department for assistance).

Biological:

C'seal is resistant to attack by fungus, insects or vermin.

SITEWORK:

Handling and storage:
No special precautions are necessary in handling C'seal. Storing of the material should ideally be in cool, dry conditions in the original packaging. Avoid placing excessive weight onto the cartons.

Application:

No special surface preparation or primers are required but surfaces in contact with the seal must be clean of dust. First ensure that the correct thickness of material is available (5 x maximum gap thickness). The material is applied by removing the protective paper, thus exposing the self-adhesive face. Depending upon the the application, the seal may be adhered to one component allowing for the opposite section to be brought together immediately and mechanically fixed. Alternatively (and more usually), the strip may be inserted edgeways into a pre-formed space. even in its compressed state, the strip can be further compressed to permit insertion into the minimum width of void to be filled. It should be noted that the C'seal will remain compressed for some time according to the on site temperature conditions (see table 1), allowing for correct positioning. The rate of expansion may be delayed by cooling in a freezer immediately prior to installation; alternatively, the expansion can be speeded-up by warming the material after installation using an indirect heat source.

Table 1 Approximate recovery rate after compression by 85%

Joints between rolls or sections of C'seal should be scarfed (except for thin sections which can be overlapped). The angle of the joint should be 45 dg and care should be taken not to stretch the material at this point. Adequate slack must be allowed where the seal hits an intersection, reaches the end of a run or as it passes around corners. This will ensure that the C'seal expands without restriction.

Guarantee

Alfas C'seal is guaranteed for ten years from the date of purchase, providing that the material has been used under normal environmental conditions in the manner specified and that it has been correctly selected and applied.

PRE - COMPRESSED SEALANT STRIP