Sika® Ucrete® CR 460

Polyurethane

12 months from date of production

The Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to the packaging.

Refer to the current Safety Data Sheet for information on safe handling and storage.

Sika® Ucrete® CR 460 has very good resistance to:

• Dilute mineral acids: chromic, hydrochloric, nitric, phosphoric and sulphuric

• Dilute alkalis

• Most dilute organic acids

• Fats, oils and sugars

• Mineral oils, most hydrocarbons, fuels, alcohols and salts

• Cleaning agents and detergents

Sika® Ucrete® CR 460 has limited resistance to:

• Concentrated mineral

• Organic acids

• Alkalis

Sika® Ucrete® CR 460 is not resistant to:

• Aggressive organic solvents such as xylene and acetone

Contact Sika® Technical Services for additional information.

Use closed cell, polyethylene foam backing rod.

The substrate temperature must be at least +3 °C above dew point to reduce the risk of condensation decreasing adhesion.

100 to 120 minutes

Poor adhesion due to inadequate surface preparation

Note: Primers are adhesion promoters. Primers cannot replace proper surface preparation and surface cleaning. Do not use primers to improve poorly prepared or poorly cleaned joint surfaces.

IMPORTANT

Poor adhesion due to incorrect priming procedure

Incorrectly defined or uncontrolled priming procedures may lead to a variation in Product performance.

• Test adhesion on project-specific substrates and agree on procedures with all parties before full project application. For more information, contact Sika® Technical Services.

The substrate must be sound, clean, dry, and free of contaminants such as dirt, oil, grease, cement laitance, sealant residues, and poorly bonded coatings, which could affect the primer and sealant's adhesion.

The substrate must be sufficiently strong to withstand the stress the sealant induces during movement.

1. To remove all weak substrate material, use techniques such as wire brushing, grinding, grit blasting, or other suitable mechanical methods.
2. Repair all damaged joint edges with suitable Sika® repair products.
3. Remove dust and loose and friable material from all surfaces before applying the sealant.

Use the following priming or pre-treatment procedures to ensure optimum adhesion and joint durability, or if the Product is used for high-performance applications such as joints on multi-storey buildings, highly stressed joints, or joints exposed to extreme weather.

1. Using a slow speed stirrer, mix the content of the Part A pail for 30 seconds to disperse any separated material.
2. Add the content of the Part B.
3. IMPORTANT: Do not mix excessively to minimise air entrainment. Mix the two parts for a further 1 to 2 minutes.
4. Ensure that no undispersed Part A is left on the side of the pail.

IMPORTANT

Strictly follow installation procedures

Strictly follow installation procedures as defined in Method Statements, application manuals and working instructions which must always be adjusted to the actual site conditions.

1. Apply the primer to the substrate using a brush. A thin layer (± 100 μm) should be applied to the joint edges.
2. While the Sika® Ucrete® P 460 is still tacky (30 minutes to 2 hours, depending on the temperature), pour in the mixed Product to fill the joint flush to the surface. The Product can be applied on angled surfaces up to 2 % without slumping.
3. When the primer has become tack-free, apply a second coat before pouring the Product to ensure proper bonding.
4. Use a spatula to smooth the surface and remove trapped air.

Clean all tools and application equipment immediately after use with Sika® Wonder Wipes or equivalent. Once cured, hardened material can only be removed mechanically.