Sikaflex®-1A

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• Certified to NSF/ANSI standard 61 for portable water

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Polyurethane

Cartridges and foil packs: 12 months from date of production

Pails and drums: 6 months from date of production

The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +41 °F and +77 °F (+5 °C and +25 °C). Always refer to packaging.

Resistant to many chemicals. Contact Sika Technical Services for additional information

−40 °F to +170 °F (−40 °C to +77 °C)

The joint dimensions must be designed to suit the movement capability of the sealant. The joint width must be ≥ 6,0 mm (¼ inch) and ≤ 40 mm (1 ½ inch). The joint depth must be ≥ 6,0 mm (¼ inch) and ≤ 12 mm (½  inch). For joints in facades a width to depth ratio of 2:1 must be maintained (for exceptions, see table below). For floor joints a width to depth ratio of 1:0.8 must be maintained. For use in horizontal joints in traffic areas, the absolute minimum depth of the sealant is 12 mm (½ inch).

Standard joint widths for joints between concrete facade elements:

Convert table below to imperial units if required.

Standard joint widths for joints between concrete facade elements:

The above information is for guidance only. All joints must be correctly designed and dimensioned in accordance with the relevant national standards and codes of practice before their construction. The basis for calculation of the necessary joint widths are the type of structure, dimensions, technical values of the adjacent building materials, joint sealing material and the specific exposure of the building and the joints.

Use closed cell, polyethylene foam backing rods.

+40 °F to +100 °F (+4 °C to +38 °C)

+40 °F to +100 °F (+4 °C to +38 °C). Min. 5 °F (3 °C) above dew point temperature
Sealants must be installed when substrates are at mid-range of their anticipated movement.

Consumption depends on the roughness and absorbency of the substrate.

These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level or wastage etc.

The substrate must be sound, clean, dry and free of all contaminants such as dirt, oil, grease, cement laitance, 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.

Removal techniques such as wire brushing, grinding, grit blasting or other suitable mechanical tools can be used.

Repair all damaged joint edges with suitable Sika repair products

New or refurbished joints must be saw-cut.

Where joints in substrate are saw cut. After sawing, all slurry material, must be flushed away and joint surfaces allowed to dry.

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

Sikaflex®-1A adheres without primers and/or activators.

For optimum adhesion, joint durability and critical, high performance applications such as joints on multi-storey 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 copper, brass and titanium-zinc, cleaned 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 applied 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).

Porous substrates
Concrete, aerated concrete and cement based renders, mortars and bricks must be primed using Sika® Primer-3 N applied with a 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. Contact Sika Technical Services for additional information. 

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.

If products mentioned above are not available in local country, replace with the appropriate local products.

For green concrete applications control joints must be cut 8 hours prior to sealant installation. Expansion joint

forms must be removed 4 hours prior to sealant installation. For wet concrete applications all excess or standing water

must be displaced and concrete must then dry for a minimum of 60 minutes prior to sealant installation.

Sikaflex-1a can be applied on green concrete after the concrete has cured for a minimum of 24 hours at +75 °F (+25 °C).

1-part ready to use

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.