SpECseal 625HD


SpECseal 625HD is a two part, low modulus,
chemically curing gun grade polysulphide joint
sealant developed specifically for dynamic joints. It is
based on a liquid polysulphide polymer which when
mixed with the hardener, cures to form a tough rubber like seal.

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Technical Details

For sealing and resealing high movement joints in building and civil engineering structures and for sealing joints in structures which are subject to high rapid movements.
• Tough and resilient seal
• Provides permanent and uniform water tight seal
• Excellent adhesion to most surfaces
• Stays flexible – no brittle or cracking due to UV exposure
• Gun grade for vertical and overhead applications
• Good chemical & weathering resistance
• Non-toxic once cured
• High resistance to ageing

Typical Properties @ 20±3 °C Movement accommodation factor (ASTM C 719) 

25% for butt joints 
Pot life 

1 hour 


6 hours 

Full cure time 

7 days 
Hardness (Shore ‘A’) 

20 ± 5 @ 7 days 

Appearance after curing 

rubber like solid 
Pull-off strength 

0.86 N/mm² 

Tensile strength 

0.35 N/mm² 
Elongation @ break 


Volume shrinkage 

Effect of heat ageing 


Solids content 


1.29 g/l 

Specific gravity 

1.70 ± 0.05 

Mixing ratio by weight (Packed as a one component product) 

Part A 


Part B 

Inert layer 



Service Temperature 

-20°C to +85°C 

Joint Preparation
The joint surface must be clean, dry and free from oil, loose mortar, laitance, release agents and other contaminants. A thorough wire brushing, grinding, sand blasting or solvent cleaning may be required to exposed clean, sound surface.

SpECseal Primer 25 for use on porous and nonporous surfaces.

SpECseal Primer 25 is a two component primer. The base and hardener components should be mixed together for 2 minutes to produce a uniform consistency.

The primer should be applied to clean, dry surfaces prior to the installation of backer rod or bond breaker tape.

The freshly mixed SpECseal 625HD should be applied after the primer is just touch dry. The sealant should be applied between 30 – 180 minutes after priming.

If the primer is left to dry longer than 3 hours the surfaces must be re-primed prior to applying the sealant.

SpECcord or SpECcell Polyethylene should be used to control the depth of the joint to the recommended thickness. Where joint design or depth of joint will not permit the use of backing rod, use a bond breaker tape over the cut back joint filler.

SpECseal 625HD is the gun grade and is supplied in 2.5 litre composite packs with the base and curing agent placed in the tin ready for mixing.

The components should be mixed for a minimum of 5 minutes to obtain a uni form colour, free from streaks. Keep scraping the inner wall of the con tainer with spatula to avoid unmixed material sticking on the wall. Mixing should take place using a slow speed drill fitted with a SpECseal paddle mixer.

We do not recommend part mixing.

Soon after mixing, the SpECseal 625HD should be loaded into a SpEC 600 ml solid barrel gun using a steel follower plate.
SpECseal 625HD is supplied in 2.5 litre tins.
SpECseal Primer 25 is supplied in one litre 2 part packs.
Contact us for more info.

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Industrial Area, Stress 42, Gate B3.

Barwa Commercial Avenue, Safwa Block Building 2, 2nd Floor

SpECseal 625HD

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