Sika SikaSeal-128

Property	Basic Colours	Transparent	Standard
Chemical Base	Neutral silicone	–
Density	~1.45–1.55 kg/L	~0.95–1.05 kg/L	ISO 1183-1
Shore A Hardness	~30–50	~20–30	ISO 868
Tensile Strength	~1.0 MPa	~0.5 MPa	ISO 8339
Elastic Recovery	>80%	ISO 7389
Movement Capability	±25%	±20%	ASTM C719
Elongation at Break	≥250%	≥200%	ISO 37
Service Temperature	−40°C min / +150°C max	–
Skin Time	~15 minutes	~5 minutes	CQP 019-1 at +23°C/50% r.h.
Curing Rate	~3 mm / 24 hours	CQP 049-2 at +23°C/50% r.h.
Shelf Life	12 months from date of production	–
Storage	Dry, upside down, below +27°C, away from direct sunlight	–

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Sika SikaSeal-128

$2.80

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SikaSeal®-128

A 1-component, non-corrosive neutral silicone sealant for indoor and outdoor use. Primerless adhesion to glass, metals, aluminium, wood, ceramic tiles, and painted surfaces. High elasticity with ±25% movement capability, low odour, and excellent UV and weathering resistance.

Overview

Specifications

Property	Basic Colours	Transparent	Standard
Chemical Base	Neutral silicone		–
Density	~1.45–1.55 kg/L	~0.95–1.05 kg/L	ISO 1183-1
Shore A Hardness	~30–50	~20–30	ISO 868
Tensile Strength	~1.0 MPa	~0.5 MPa	ISO 8339
Elastic Recovery	>80%		ISO 7389
Movement Capability	±25%	±20%	ASTM C719
Elongation at Break	≥250%	≥200%	ISO 37
Service Temperature	−40°C min / +150°C max		–
Skin Time	~15 minutes	~5 minutes	CQP 019-1 at +23°C/50% r.h.
Curing Rate	~3 mm / 24 hours		CQP 049-2 at +23°C/50% r.h.
Shelf Life	12 months from date of production		–
Storage	Dry, upside down, below +27°C, away from direct sunlight		–

Usage

Weatherproof joints between glass, metals, painted surfaces, aluminium, wood, and ceramic tiles
Window and door installation
Tile perimeter joints
General joint sealing – interior and exterior

Advantages

Good UV and weathering resistance
Primerless adhesion to a wide range of substrates
High elasticity and flexibility (±25% movement capability)
Low odour, neutral curing
Non-corrosive – safe for use with metals

Packaging

~280 ml (420 g) cartridge – basic colours (12 per box)
~280 ml (280 g) cartridge – transparent
~600 ml (900 g) sausage – basic colours (20 per box)
~600 ml (600 g) sausage – transparent (20 per box)

Colour

White, Transparent, Grey, Black (others on request)

Important – Do NOT Use On

Alkaline surfaces such as concrete, plaster, and masonry
Bituminous substrates, natural rubber, or EPDM rubber
Natural stone, marble, or granite (bleeding may occur)
Joints in and around swimming pools
Joints under water pressure or permanent water immersion
Totally confined spaces (requires atmospheric moisture to cure)
Structural glazing or insulated glazing / food contact applications

Product Details

Product Information

Property	Detail
Composition	Neutral silicone (1-component)
Shelf Life	12 months from date of production
Storage Conditions	Dry, upside down, below +27°C, protected from direct sunlight

Technical Information – Consumption Guide

Joint Width (mm)	Joint Depth (mm)	Joint Length per 300 ml
6	4	~12.5 m
9	5	~6.5 m
12	6	~4 m
20	10	~1.5 m

Joint Design

For joints ≥10 mm and ≤20 mm wide: recommended joint depth of 10 mm
For larger joints, contact Sika Technical Service Department

Application

Application Information

Parameter	Value
Ambient Temperature	+5°C min / +40°C max (min. 3°C above dew point)
Substrate Temperature	+5°C min / +40°C max (min. 3°C above dew point)
Skin Time (basic colours)	~15 minutes at +23°C / 50% r.h.
Skin Time (transparent)	~5 minutes at +23°C / 50% r.h.
Curing Rate	~3 mm / 24 hours at +23°C / 50% r.h.

Application Steps

Substrate Preparation: Surface must be sound, clean, dry, and free from dirt, oil, grease, old sealants, and poorly bonded coatings. Remove all dust and loose material. SikaSeal®-128 adheres without primers or activators on most substrates.
Priming – Non-Porous Substrates (for optimum adhesion): Aluminium, anodised aluminium, stainless steel, PVC, galvanised steel, powder-coated metals, glazed tiles: lightly abrade, clean, and pre-treat with Sika® Aktivator-205. Wait >15 min (<6 hours). Other metals (brass, titanium-zinc): apply Sika® Aktivator-205, wait >15 min, then prime with Sika® Primer-3 N. Wait >30 min (<8 hours). PVC: apply Sika® Primer-215, wait >30 min (<8 hours). Glass: clean with Isopropanol.
Priming – Porous Substrates: Prime with Sika® Primer-3 N by brush. Wait >30 min (<8 hours) before sealing.
Masking: Apply masking tape where neat joint lines are required. Remove within the skinning time after finishing.
Joint Backing: Insert a suitable backing rod to the required depth.
Application: SikaSeal®-128 is ready to use. Prepare the cartridge or foil pack, insert into the sealant gun, and fit the nozzle. Extrude into the joint ensuring full contact with joint sides. Avoid air entrapment.
Finishing: Immediately tool the sealant firmly against the joint sides for adequate adhesion and a smooth finish. Use a compatible tooling agent (water is suitable). Do not use solvent-based tooling products.
Cleaning: Clean tools immediately with Sika® Remover-208. Hardened material can only be removed mechanically. For skin cleaning, use Sika® Cleaning Wipes-100.