SONOLASTIC SL2  

Description

A two-component polyurethane sealant that when mixed and poured in place cures to form a tough, resilient joint seal that resists penetration, abrasion, and remains flexible through exposure to weather and aging. SL 2 is available in both self-leveling and slope-grade versions. It can be colour matched to any substrate.

Features

• Movement capability ± 25%.
• Abrasion resistant.
• Resists penetration
• Resilient.
• Service range from -40°C to 82°C.
• Resistant to weathering and aging.
• Available in custom colours.
• Self-levelling and slope grade.

Where to use SL 2

• Concrete expansion joints
• Metal expansion joints
• Interior or exterior
• Sidewalks
• Pavements
• Decks
• Parking ramps
• Precast double T's
• Cantilever decks
• Warehouses
• Balconies
• Industrial applications

Benefits

• Suitable for pedestrian and vehicular traffic

• Withstands pressure from pointed objects

• Resists permanent deformation

• Suitable for all climates
• Long service life
• Wide range of colours
• Versatility in applications

Packaging

SL 2 is available in 5.67 litre units containing Part A and Part B.

Primer 733

Cans, 0.58 litres

Coverage rate of primers is approximately 138 linear metre per 0.58 litre for a 13 mm deep joint.

Colours

Refer to your nearest BASF office for availability of standard, colours.

455 standard (non-stocked) colours are also available, and custom matching can be done upon request. Refer to the Rainbow of Colours book.

Standards

• Federal Specification TT-S-00227E, Type I, Class A
• Corps of Engineers CRD-C-506, Type I, Class A
• ASTM C 920, Type M, Grade P, Class 25, Use T and M
• Canadian Specification CAN/CGSB 19.24-M90, Classification MCG-1-40-B-L, No. 81031
• Canadian approval for use in establishments that handle food
• USDA approval for use in areas that handle meat and poultry

Typical properties* of cured sealant

Test results are averages obtained under laboratory conditions. Reasonable variations can be expected.

For best performance

• SL 2 is not intended for immersion or for use in areas of high chlorine concentration such as swimming pool surrounds.
• Backer-rods, joint fillers, or bondbreakers must be tight to the sides of the joint to prevent loss of sealant through the bottom.
• For joints subject to puncture by high heels or umbrella points, a stiffer or higher density backup material is required. Cork or rigid non-impregnated cane-fiber joint fillers are suitable. Separate materials from the sealant by a non-adhering bondbreaker (polyethylene tape).
• Do not use other caulks or sand as a bottom bed in a joint.
• Do not install when rain is expected before the sealant reaches initial cure (about 12 hours).
• Surfaces in contact with sealant should be fully cured.
• Units of SL 2 are premeasured; do not use partial units.
• SL 2 (slope grade) has been successfully tested on grades up to 12% at 49°C without any significant run down; for slopes greater than 12%, use NP 2 sealant.
• Make certain the most current version of this data guide is being used; call Customer Service (04-8818123) to verify the most current version.
• Proper application is the responsibility of the user. Field visits by BASF Middle East personnel are for the purpose of making technical recommendations only, and are not to supervise or provide quality control on the job site.
• Do not allow uncured sealants to come into contact with alcohol-based materials or solvents.
• Do not apply polyurethane sealant near uncured silicone sealants.

Directions for use

Joint preparation:

• The number of joints and the joint width should be designed for a maximum of ±25% movement.
• The depth of the sealant should be ½ the width of the joint. The maximum depth is 13mm regardless of joint width and the minimum is 6mm.
• In deep joints, the sealant depth must be controlled by Closed Cell Backer-Rod or Soft Backer Rod. Where the joint depth does not permit the use of backer-rod, a bondbreaker (polyethylene strip) must be used to prevent three-point bonding.
• To maintain the recommended sealant depth, install backer-rod by compressing and rolling it into the joint channel without stretching it length-wise. Closed-Cell Backer-Rod should be about 3 mm larger in diameter than the width of the joint to allow for compression. Soft Backer-Rod should be approximately 25% larger in diameter than the joint width. Backer-Rod becomes an integral part of the joint. The sealant does not adhere to it, and no separate bondbreaker is required. Do not prime or puncture the backer-rod.

Surface preparation:

• It is essential that joints be clean and dry. Joint surfaces must be structurally sound, fully cured, and free of all loose aggregate, paint, oil, grease, asphalt.
• Wax, mastic compounds, waterproofing compounds, form release materials, curing compounds or any other contaminants.

New concrete: Remove all loose material from joints by wire brushing. Sandblast surfaces in contact with form release agents. New concrete must be fully cured. Laitance must be removed by abrading.

Old concrete: For previously sealed joints, remove all old material by mechanical means. If joint surfaces have absorbed oils, remove sufficient concrete to ensure a clean surface.

Priming:

• Joint surfaces must be primed with Primer 733 before sealing. If the surfaces are other than masonry or concrete, test first to determine adhesion. Technical assistance is available from BASF.
• Apply primer in a thin uniform film. Avoid build-up of film.
• Allow approximately 15-20 minutes drying time before applying sealant (primer should be tack free). Sealant must be applied same day as primer.
• To minimize contamination of adjacent surfaces, apply masking tape and remove before sealant has begun to thicken and set.

Mixing:

• SL 2 is a two-component system and must be thoroughly mixed before use. The oversize base container allows for the addition and mixing of Part B and colour pigment into Part A.
• Transfer Part B to Part A container using a spatula or knife. It is imperative that the entire contents of Part B be combined with Part A. With a slow-speed drill and a sealant mixing paddle, thoroughly mix 2-3 minutes. The paddle blade must be kept below the surface of the sealant to avoid whipping in air. Transfer the contents of the pigment can into the mixed Part A and B. Use a spatula or knife, removing the entire contents to ensure consistent colour. Continue mixing with a slow speed drill and sealant paddle until colour is uniform. During the process, scrape the sides and bottom of the Part A container can and the paddle itself several times.
• Pot life of the sealant is dependent upon temperature. See table 1 for specific data.

Application:

• All caulking and sealing should be performed when temperatures are above 4°C; any moisture or frost on surfaces will adversely affect adhesion.
• Ideally, the temperature at the time of application should be the median of temperature extremes when the joint width opening is at its midpoint.
• Fill joints from the bottom; avoid bridging of the joint, which may form air voids.
• For large joints, the self-leveling grade may be poured directly from the can.
• For smaller joints and for all slope-grade applications, fill the joint by flowing the sealant from a bulk-loading gun.
• Light tooling of the slope-grade sealant is recommended to smooth out ripples. On sloped surfaces, tool from the lowest point to the highest. Do not use soap or solvent.

Clean up

• Immediately after use and before sealant has cured, clean equipment with SOLVENT NO. 2 or Xylene.
• The cured sealant may be removed by cutting with a sharp-edged tool, thin films by abrading.

Curing

Cure time will vary with humidity and temperature. Initial cure is within 24 hours and complete cure takes approximately 7 days.

Cure rates are dependent on temperature and humidity. Protect joint from dirt and traffic until cured.

Shelf life

Shelf life of both products is 12 months when stored in unopened containers under normal conditions.

Coverage

Linear Metres per litre

joint width (mm)

Warning

SL 2 Part A, contains calcium oxide, calcium carbonate, silicon dioxide, toluene diisocyanate mix, naphtha light aromatic 1,2,4 trimethyl benzene.

Risks

Combustible liquid and vapor. May cause skin, eye, or respiratory irritation. May be absorbed through skin. Repeated or prolonged exposure increases the risk of absorption. Potential skin and respiratory sensitizer. Reports associate repeated or prolonged occupational overexposure to solvents with permanent brain, nervous system, liver, and kidney damage. INTENTIONAL MISUSE BY DELIBERATELY INHALING THE CONTENTS MAY BE HARMFUL OR FATAL.

Warning

SL 2 Part B, contains methylene bisphenol diisocyanate, calcium oxide, calcium carbonate, silicon dioxide, mineral spirits, asphalt.

Precautions

KEEP OUT OF THE REACH OF CHILDREN. KEEP AWAY FROM HEAT, FLAME AND SOURCES OF IGNITION. Use only with adequate ventilation. Keep container closed. Prevent contact with skin, eyes, and clothing. Wash thoroughly after handling. Avoid breathing vapors. Use impervious gloves, goggles, and if the TLV is exceeded or if used in a poorly ventilated area, use NIOSH/MSHA approved respiratory protection in accordance with applicable federal state, and local regulations. DO NOT cut or weld on or near empty container. Empty container may contain explosive vapors or hazardous residues. All label warnings must be observed until container is commercially cleaned or reconditioned.

First aid

In case of eye contact, flush thoroughly with water for at least 15 minutes SEEK IMMEDIATELY MEDICAL ATTENTION. In case of skin contact, wash affected areas with soap and water. If irritation persists, SEEK MEDICAL ATTENTION. If inhalation causes physical discomfort or any breathing difficulty occurs or if swallowed, SEEK IMMEDIATE MEDICAL ATTENTION.

See Material Safety Data Sheet (MSDS) for further information.