SikaSeal-128 280ml | Multipurpose neutral silicone sealant.
Product Category: Silicone Sealant
Brand: Sika
Model Code: SikaSeal®-128
Description
SikaSeal®-128 is a 1-component neutral silicone sealant, non-corrosive and suitable for indoor and outdoor applications. It is designed for multipurpose joint sealing and weatherproofing across a wide range of construction materials.
Applications
Weatherproof sealing between multiple substrates
Window and door installation
Tile perimeter joints
General construction joint sealing
Suitable substrates:
Glass
Metals
Aluminium
Painted surfaces
Wood
Ceramic tiles
Key Features
Excellent UV and weather resistance
Primerless adhesion on many substrates
High elasticity and flexibility
Neutral curing (low odor)
Non-corrosive formulation
Suitable for long-term outdoor use
Product Information
Type: Neutral silicone sealant
Composition: Neutral silicone
Packaging:
~330 g cartridge (clear)
~460 g cartridge (basic colors)
~600 g cartridge (clear)
~900 g cartridge (basic colors)
Packing:
12 or 20 cartridges per box
Colours:
White, Clear, Grey, Black
Custom colours on request
Shelf Life: 12 months
Storage:
Dry conditions
Store upside down
Below +27°C
Avoid direct sunlight
Density
Basic colors: 1.45 – 1.55 kg/L
Clear: 0.95 – 1.05 kg/L
Technical Data
Mechanical Properties
Shore A Hardness:
30–50 (basic colors)
20–30 (clear)
Tensile Strength:
~1.0 MPa (basic colors)
~0.5 MPa (clear)
Elastic Recovery: >80%
Elongation at Break:
≥250% (basic colors)
≥200% (clear)
Movement & Temperature
Movement Capability:
±25% (basic colors)
±20% (clear)
Service Temperature:
-40°C to +150°C
Consumption Guide (per 300 ml)
Joint Width
Joint Depth
Coverage
6 mm
4 mm
~12.5 m
9 mm
5 mm
~6.5 m
12 mm
6 mm
~4 m
20 mm
10 mm
~1.5 m
Application Conditions
Air temperature: +5°C to +40°C
Substrate temperature: +5°C to +40°C
Must be ≥3°C above dew point
Performance
Curing Rate: ~3 mm / 24 hrs
Skin Time:
~15 minutes (basic colors)
~5 minutes (clear)
Joint Design
Recommended width: 10–20 mm
Recommended depth: 10 mm
Larger joints → consult technical service
Substrate Preparation
Surface must be:
Clean, dry, and sound
Free from oil, grease, dust, old sealant
Remove loose materials before application
Primer / Treatment
Generally primerless adhesion
For high-performance applications:
Non-porous substrates:
Aluminium, steel, PVC, tiles → Aktivator-205
Brass / zinc → Aktivator-205 + Primer-3 N
Porous substrates:
Use Primer-3 N
Application Method
Apply masking tape (optional)
Insert backing rod
Prime if required
Apply sealant using gun
Ensure full contact with joint sides
Avoid air entrapment
Tool immediately for smooth finish
Remove tape within skin time
Cleaning
Tools: Sika® Remover-208
Skin: Sika® Cleaning Wipes-100
Limitations / Restrictions
Do NOT use:
On concrete, plaster, masonry (alkaline surfaces)
On porous materials (stone, marble, granite)
For structural glazing
Under water pressure or immersion
In swimming pools
In confined spaces without airflow
On materials releasing oils/plasticizers
Where abrasion or heavy mechanical stress occurs
For medical or food applications
Notes
Cannot be painted
Colour variation may occur (aesthetic only)
Performance Advantages
Strong adhesion without primer
Flexible and durable joint sealing
Excellent resistance to UV, weather, and temperature
Wide compatibility with construction materials
Safety & Handling
Follow Safety Data Sheet (SDS)
Use proper PPE
Store properly in sealed packaging
Additional Notes
Laboratory-tested values
Site conditions may affect performance
Check local product regulations
Summary
SikaSeal®-128 is a high-performance neutral silicone sealant ideal for multi-purpose joint sealing, offering excellent flexibility, UV resistance, and strong adhesion across various materials, making it suitable for both interior and exterior construction applications.