SUPRASEC® 2496

SUPRASEC® 2496 MDI is designed for use in the production of polyurethane polymer concrete. It is a specialized mid-functionality, polymeric MDI which offers a high degree of compatibility with a variety of polyols and cement mixture.

Note: Products made from SUPRASEC® 2496 MDI will yellow with exposure to UV light (including sunlight). Users should make their own tests to determine the suitability of this product for their own particular purposes.

Product designed for use in coatings, provides enhanced adhesion, low temperature stability and good flow properties.

SUPRASEC® 2496 MDI is an organic isocyanate and, as such, requires care in handling because it reacts with water and organic compounds containing active hydrogen groups. Because the reaction of SUPRASEC® 2496 MDI with water produces carbon dioxide gas, containers that have become contaminated with moisture should not be subsequently sealed; otherwise, pressure build-up will result.

Moisture, either as a vapor or liquid, is the most probable cause of diisocyanate contamination. SUPRASEC® 2496 MDI reacts readily with water, producing solid deposits and evolution of carbon dioxide gas. Storage under a slight positive pressure (a few inches water gauge) of dry nitrogen is essential to prevent ingress of moisture. Care should be taken, however, in using any pressure above 5 psig., as increasing solubility of the gas in the diisocyanate may adversely affect further processing steps or products. Carbon dioxide should not be used for this purpose at any pressure because of its solubility in diisocyanates.

Freshly manufactured SUPRASEC® 2496 MDI is a light brown liquid. Sedimentation is usually due to contamination from atmospheric moisture or to dimer formation. Reaction from atmospheric moisture can be prevented by storing SUPRASEC® 2496 MDI in carefully sealed containers or under a dry nitrogen atmosphere. During handling, SUPRASEC® 2496 MDI must also be protected from atmospheric moisture and water ingress, and containers must be carefully resealed after each sampling.

A small amount of finely divided insoluble solid in the liquid product does not usually cause difficulties in handling or product performance. However, if necessary, the liquid product may be filtered through a suitable in-line filter. It is suggested that the filter vessel be of stainless steel with a suitable polypropylene filter bag. The lines should be heated and blown clear with nitrogen after use.

The recommended storage temperature for SUPRASEC® 2496 MDI is 60-100°F (16-38°C). If the product has been exposed to temperatures below the recommended storage temperatures for more than a few hours, the material may increase in viscosity. If this occurs, the product may be heated to room temperature to reduce viscosity.

Empty containers should not be disposed of until all hazardous residue has been removed. Remove container from work area, preferably outdoors, or in a well ventilated area. Fill container with decontamination solution containing 3-8% ammonia and 0.2-0.5% detergent and allow to stand for 48 hours. Do not seal or otherwise close bungs in container. After draining the container, puncture or crush it in accordance with waste disposal regulations.