SikaSeal®-128

Neutral silicone.

SikaSeal®-128 has a shelf life of 12 months from the date of production, if it is stored properly in undamaged, original, sealed packaging, and if the storage conditions are met.

Store in dry conditions, upside down and protected from direct sunlight and at temperatures below +27 °C.

~1.45-1.55 kg/l (Basic colors). 
~0.95-1.05 kg/l (Transparent color).                                                (ISO 1183-1)

~30-50 (Basic colors)                                                                              (ISO 868)
~20-30 (Transparent  color)

~1.0 MPa (Basic colors).                                                                        (ISO 8339)
~0.5 MPa (Transparent color).

≥ 250% (basic colors)                                                                                (ISO 37)
≥ 200% (transparent color)

± 25% (basic colors)                                                                          (ASTM C719)
± 20% (transparent color)

> 80 %                                                                                                    (ISO 7389)

-40 °C min. / +150 °C max.

The joint width must be designed to suit the joint movement required and the movement capability of the sealant. For joints ≥ 10 mm and ≤ 20 mm wide, a joint depth of 10 mm is recommended.
For larger joints please contact our Technical Service Department.

+5 °C min. / +40 °C max.
> 3 °C above dew point.

+5 °C min. / +40 °C max.
> 3 °C above dew point.

~3 mm / 24 hours (23 °C / 50 % r.h.)                                                (CQP 049-2)

20-50 minutes (basic colors) (23 °C / 50 % r.h.)                            (CQP 019-1)
05-15 minutes (transparent color)

Joint Width                        Joint Depth                          Joint Length / 280 ml      
6 mm                                   4 mm                                   ~11.7 m                       
9 mm                                   5 mm                                   ~6.2 m                         
12 mm                                 6 mm                                   ~3.9 m                            
20 mm                                 10 mm                                 ~1.4 m                         

The substrate must be sound, clean, dry and free of all contaminants such as dirt, oil, grease, old sealants and poorly bonded paint coatings which could affect adhesion of the sealant. The substrate must be of sufficient strength to resist the stresses induced by the sealant during movement.

All dust, loose and friable material must be completely removed from all surfaces using suitable equipment before application of any activators, primers or sealant.

SikaSeal®-128 adheres without primers and/or activators.

For optimum adhesion, joint durability and critical, high performance applications such as joints on multistorey buildings, highly stressed joints, extreme weather exposure or water immersion / exposure, the following priming and/or pre-treatment procedures must be followed:

Non-porous substrates

Aluminium, anodised aluminium, stainless steel, PVC, galvanised steel, powder coated metals or glazed tiles.Slightly roughen surface with a fine abrasive pad.

Clean and pre-treat using Sika® Aktivator-205 applied with a clean cloth.

Before sealing, allow a waiting time of > 15 minutes (<6 hours).

Other metals, such as brass and titanium-zinc, clean and pre-treat using Sika® Aktivator-205 applied with a clean cloth. After a waiting time of > 15 minutes (< 6 hours), apply Sika® Primer-3 N by brush. Before sealing, allow a waiting time of > 30 minutes (< 8 hours) PVC has to be cleaned and pre-treated using Sika® Primer-215 applied with a brush. Before sealing, allow a waiting time of > 30 minutes (< 8 hours).

Glass must be cleaned with Isopropanol before application.

Porous substrates

Porous substrates must be primed using Sika® Primer-3 N applied by brush.

Before sealing, allow a waiting time of > 30 minutes (<8 hours).

Adhesion tests on project specific substrates must be performed and procedures agreed with all parties before
full project application.

For more detailed advice and instructions contact Sika Technical Services.

Note: Primers and activators are adhesion promoters and not an alternative to improve poor preparation / cleaning of the joint surface. Primers also improve the long term adhesion performance of the sealed joint.

Clean all tools and application equipment with Sika® Remover-208 immediately after use. Hardened material can only be removed mechanically. For cleaning skin, use Sika® Cleaning Wipes-100.