Permasil® 626


Permasil 626 is a metal sealant. It is non-acid (neutral) cure silicone sealant available in translucent. Permasil 626 meets most sealing requirements of plumbing, roofing and building tradesmen.


Permasil 626 metal to metal Sealant is recommended for use with the John Lysaght (Aust.) Ltd. range of Zincalume?, Colorbond?, Exterior Marviplate? and zinc coated products, Alcan and Comalco aluminium systems and Hunter Douglas Flexalum and Permalum products.

Permasil 626 can be used for sealing lap joints in roofing, flashings, ridge caps and gutters. Sealing rivet heads, prickle caps, seams and joints (galvanised iron, glazed tiles, rigid PVC, copper, brass, zinc).

It seals old gutters to new, weatherproofs skylights, vents and flashings and can be used to weatherproof caravans and truck bodies.

Product Range

Product Code: 9300697608659

  • Size & Pack Type: 310g cartridge
  • Color: Translucent

Technical Features

  • Excellent tradesman’s grade general purpose sealant. Will not attack zinc or zinc containing metals or cementious surfaces. (Note: acid releasing silicone sealants attack these surfaces which leads to poor adhesion).
  • Excellent flexibility (joint movement capability ±25%)
  • Service temperature range –60oC to +150oC

Application Tips

  • Not recommended as a plug or caulk for burst pipes or rusted guttering.
  • Most paints will not adhere to this sealant.

Technical Details and Performance

Time for strong bond depends on nature and condition of application. A minimum of 24 to 48 hours is needed for sufficient strength to develop. The bond will continue to strengthen over time. Full cure up to 14 days.

Curing is achieved by evaporation of solvent. Time to achieve full strength is increased: at constant low temperatures; when thick applications (joints) are used; wide areas are bonded; when bonded surfaces are impervious (e.g. metals and glass).

Indicative information only, not to be used for setting specifications.

Consistency (as applied)

Non-slump, solvent free paste, easily extruded with cartridge gun

Curing Mechanism

Rapidly develops rubber consistency by reaction with moisture from the air

Curing Rate

2mm depth per day

Skin Forming Time

5-10 minutes (depending on weather conditions)

Hardness (when cured)

Approximately 18 (Shore A, instantaneous)


Approximately 400% (ASTM D412)

Service Temperature

–60oC to +150oC

Joint Movement

±25% of original joint width


when applied in properly designed joint*

Properly designed joint refers to the accepted concept of correct sealant dimensions, i.e. sealant depth equal to half sealant width and sealant applied over a suitable backing material which the sealant will not adhere to or which does not limit the free movement of the sealant.

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