Sika® Polysulphide Gun Grade

Two component polysulphide sealant – Gun Grade

Sika® Polysulphide Gun Grade is a two component Polysulphide sealant. It is used for sealing expansion joints where large movement is anticipated in concrete construction and for joints between diverse construction materials. It is suitable for sealing joints subjected to vehicular traffic and is chemically resistant to water, fuels, oils and solvents.

  •  Excellent adhesion with most common construction materials
  •  Resistant to UV and weathering in exposed conditions
  •  High movement accommodation

Usage

Wherever a permanently flexible seal is required, it is used in horizontal expansion joints in many types of buildings and civil engineering constructions such as

  • Precast concrete elements
  • Dams, Reservoirs and water treatment plants
  • Residential & Commercial buildings
  • Subways, bridges, culverts, tunnels
  • Rigid pavements of highways, airport runways, aprons, etc

Packaging

Part A

3.68 kg

Part B

0.32 kg

Part A+B

4 kg x 2 sets

Advantages

  • Excellent adhesion with most common construction materials
  • Resistant to UV and weathering in exposed conditions
  • High movement accommodation
  • Non-sag in vertical and overhead joints
  • Good chemical resistance
  • Permanently elastic and forms watertight seal
  • Flame and fuel resistant
  • Easy to use
  • Economical

Colour

Grey Paste

Product Information

Chemical Base

Cross linking polysulphide

Shelf Life

12 months from the date of production

Storage Conditions

Store properly in unopened, undamaged and sealed original packaging in cool and dry condition at temperature +5°C to +25°C at a Relative Humidity of 50%

Density

1.6 -1.7 kg/litre at 30°C

(JIS K 6820)

Application steps

SUBSTRATE PREPARATION

  • All surfaces must be clean, dry and free from any loosely adhering particles
  • Check the joints edges for soundness and if found weak cut recess and fill up with suitable repair mortar (Consult Sika® Technical services). Correct joint depth can be established by inserting polyethylene based Sika® Backer Material tightly into the joint. When the joints have been filled with fibre filled board, this must be raked back to the required depth. Use bond breaker tape over the backer material. Protect surfaces with masking tape.
  • Sika® Primer-3 should be used as a primer only on the two sides.Allow a flash-off time of at least 45 minutes before sealant application (maximum 8 hours).

MIXING

The two components are mixed in the ratio Comp. A : Comp B = 92 : 8 by weight with a low speed mixer (300 – 600 rpm). Mix for approximately 8 – 10 minutes until a smooth, even consistency is achieved.

CLEANING OF TOOLS

Clean all the tools with Solvent immediately after use. Hardened/ Cured material can only be mechanically removed.

Technical Information

Shore A Hardness

18 ± 4

(ASTM D2240)

Elongation

≥ 450%

(ASTM D 882)

Elastic Recovery

Before Ageing

> 75%

After Heat Ageing (70 °C / 14 days)

> 75%

After fuel immersion (48 hrs)

> 75%

Movement Capability

± 25% 

(IRC : 57-2006)

Resistance to Fire

Pass (Flame Resistance Test)

(BS 5212-1990)

Service Temperature

-40°C to  + 80 °C

Joint Design

Type of substrate or application

Minimum joint depths

Metals, glass and other non-porous surfaces.

5 mm

Porous surfaces like brick and concrete.

10 mm
Traffickable joints and those subject to hydraulic pressures. 20 mm

The product may be applied to joint between 5 to 50 mm wide. Joints subjected to cyclic movements should be designed for an optimum Width/Depth ratio of 2 : 1 (W = 2D).

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