POLYURETHANE SEALANT

Urochem 299 LV is a two-component low viscosity, semi self-levelling sealing compound based on a polyether polyurethane. It is blended with fillers and a chemical curing agent, which reacts after mixing to form a durable rubber like seal. This sealant is highly elastic and is able to withstand continuous extension and recovery. It may be used with most common building materials such as concrete, plaster, brick, and stone. It exhibits superior resistance to abrasion, ultraviolet light and ozone making it suitable for exterior use. Due to its excellent water resistance and adhesion and resistance to biodegradation, it forms the ideal material for use in sewage treatment plants. Urochem 299 LV cannot be used on vertical surfaces due to its low viscosity.

• The recommended minimum joint dimension is 6 x 6mm, but where possible we recommend a 10 x 10mm joint.
• For joints ranging from 6mm to 10mm wide, we recommend a width to depth ratio of 1:1, for anything wider a 2:1 width to depth ratio should be maintained.
• In water retaining structures a 1:1 ratio should be maintained due to Hydrostatic pressure and cyclic movement.
• These ratios provide the optimum geometry to allow movement to occur within the joint without placing excessive force on the joint faces.
• Joint faces should be parallel, and the joint width should be at least four times the anticipated movement.
• When placing the sealant, the joint opening should if possible be central to its maximum compression/expansion cycle.

•  To form a long-lasting water and weatherproof seal in horizontal movement joints which are subject to continuous cyclic movement.
• Typical applications include horizontal expansion joints in floors, drainage channels and sewage treatment plants.

To ensure proper movement of the joint a bond breaker must be used at the base of the joint. Where a backing material such as polyethylene foam rod is used to ensure the correct joint geometry, a bond breaking tape is not required. For water retaining structures care must be taken to comply with the design requirements as set by the project engineer.

• Urochem 102 Silane Primer should be used on glass, ceramics and sound masonry and brick surfaces not subjected to water immersion.
• For water retaining structures, porous or friable surfaces or where severe conditions are expected use Urochem 101, 106 or 614. Refer to relevant data sheet.

The correct preparation of the joint faces is absolutely essential to the satisfactory performance of the sealant. All surfaces should be clean, sound, and dry, and laitance or surface contamination should be removed by thorough wire brushing, grinding or grit blasting. Vacuum or blow with compressed air to ensure thorough removal of dust. Metal surfaces should be free of mill scale and rust and mild steel treated with a suitable anticorrosive primer.

 Contact with skin should be avoided by wearing gloves and protective clothing. The activator is slightly caustic. In case of eye contact wash well and obtain medical advice.

• Urochem 299 LV is supplied in a two-part kit, base, and activator in separate tins.
• Transfer the total quantity of activator into the base component and mix thoroughly using a slow speed electric drill fitted with a flat blade stirrer.
• Scrape down the sides of the can and the base and remix until the colour is uniform and free from streaks.
• Thorough mixing is essential and should take 5 to 10 minutes.

Pour into primed joint’s using a suitable container and level surface using a scraper.

Clean all tools and equipment with Urochem 901 before curing of the sealant has occurred.

(No allowance made for wastage)