RUBINATE® 44

RUBINATE® 44 MDI isocyanate is ideally suited for high performance polyurethane lastomer applications, sealants, coatings and adhesives. Ask your Huntsman Polyurethanes sales representative for specific end-use information. Note: Products made from RUBINATE® 44 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.

RUBINATE 44 MDI isocyanate is ideally suited for high performance polyurethane elastomer applications, sealants, coatings and adhesives.
Note: Products made from RUBINATE 44 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.

• Small 50-lb. (22kg) pails may be melted out in a hot-air oven but, for the larger 500 lb. (225 kg) drums, the recommended procedure is to use a steam chest or hot-water bath. Electrical drum heaters are not recommended because of the risk of localized overheating.
• Incorrect melting procedures involving prolonged heat-treatments or local overheating of containers will lead to the formation of insoluble dimer. Dimer formation is minimized by rapid and uniform heating.
• Hot-Air Oven: The temperature of the hot-air oven should be within the range of 158-176 °F (70-80°C). The ovens must be fitted with adequate ventilation equipment. The pail, which must be placed in the oven supported above the floor to allow the hot air to circulate efficiently around it, should be shaken or rotated frequently. Under these conditions, complete melting of the components may take up to 15 hours. The liquid will begin to re-solidify at about 102°F (39°C).
• Hot-air ovens are not recommended for 500-lb. (225 kg) drums, the contents of which are best melted using the faster rate of heat transfer obtainable with steam chest or a hot-water bath.
• Hot-Water Bath or Steam Chest: Place the drum, with the seal in place and firmly close, in the heating area and adjust the temperature to about 175F (80°C). In the case of a hot-water bath, where the heating is provided by means of an immersion heater, it is essential to provide some circulation of the water. The water level in the bath must remain below the top of the drum, i.e. the drum must not be totally submerged.
• It cannot be emphasized too strongly that water and steam must be rigorously excluded from contact with RUBINATE 44 MDI. Before immersing the drum in water, it should be carefully inspected to be sure there are no punctures or other damage to the drum which would allow leakage of molten MDI or incursion of water.
• After about five hours, the drum is removed from the chest/bath, the top dried, and the drum is rolled to homogenize the contents. The molten material will begin to re-solidify at about 102°F (39°C) if it is not used immediately. The drum must be opened carefully to allow for pressure relief. It is very important that this procedure be carried out in a properly ventilated area and that the health and safety considerations described are followed.
• 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 propylene filter bag. The lines should be heated and blown clear with nitrogen after each use.

Small 50-lb. (22kg) pails may be melted out in a hot-air oven but, for the larger 500 lb. (225 kg) drums, the recommended procedure is to use a steam chest or hot-water bath.
Electrical drum heaters are not recommended because of the risk of localized overheating. Incorrect melting procedures involving prolonged heat-treatments or local overheating of
containers will lead to the formation of insoluble dimer. Dimer formation is minimized by rapid and uniform heating. Hot-Air Oven: The temperature of the hot-air oven should be within the range of 158-176 °F (70-80°C). The ovens must be fitted with adequate ventilation equipment. The pail, which must be placed in the oven supported above the floor to allow the hot air to circulate efficiently around it, should be shaken or rotated frequently. Under these conditions, complete melting of the components may take up to 15 hours. The liquid will
begin to re-solidify at about 102°F (39°C). Hot-air ovens are not recommended for 500-lb. (225 kg) drums, the contents of which are best melted using the faster rate of heat transfer obtainable with steam chest or a hot- water bath.

Hot-Water Bath or Steam Chest: Place the drum, with the seal in place and firmly close, in the heating area and adjust the temperature to about 175°F (80°C). In the case of a hot-water bath, where the heating is provided by means of an immersion heater, it is essential to provide some circulation of the water. The water level in the bath must remain below the top of the drum, i.e. the drum must not be totally submerged.

It cannot be emphasized too strongly that water and steam must be rigorously excluded from contact with RUBINATE® 44 MDI. Before immersing the drum in water, it should be carefully inspected to be sure there are no punctures or other damage to the drum which would allow leakage of molten MDI or incursion of water. After about five hours, the drum is removed from the chest/bath, the top dried, and the drum is rolled to homogenize the contents. The molten material will begin to re-solidify at about 102F (39°C) if it is not used immediately. The drum must be opened carefully to allow for pressure relief. It is very important that this procedure be carried out in a properly ventilated area and that the health and safety considerations described are followed. 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 propylene filter bag. The lines should be heated and blown clear with nitrogen after each use.

The reaction of isocyanates with water leads to the formation of insoluble ureas and carbon dioxide gas which can result in pressure build-up inside closed containers. Therefore, extreme care must be taken to assure containers used for RUBINATE® 44 MDI remain dry. Freshly manufactured RUBINATE® 44 MDI isocyanate melts to form a clear liquid. Sedimentation is usually due to contamination from atmospheric moisture or to dimer formation. Reaction from atmospheric moisture can be prevented by storing RUBINATE® 44 MDI in carefully sealed containers or under a dry nitrogen atmosphere. During handling, RUBINATE® 44 MDI must also be protected from atmospheric moisture and water ingress, and containers must be purged with dry nitrogen and carefully resealed after each sampling.
The level of formation of insoluble dimer is highly dependent upon both the temperature at which the MDI is stored and the length of time it is stored. The most practical and convenient way to store and handle purified MDI is the molten state. Bulk shipments are made in temperature-controlled road tankers at a temperature of 110-120°F (43-50°C)
and is stored at 105-112°F (42°C ± 2°C) under a dry nitrogen blanket. Under these storage conditions RUBINATE® 44 MDI should remain free of precipitated dimer and haze for approximately two weeks
For small volume usage, RUBINATE® 44 MDI can be delivered in drums and stored as a frozen solid. The material is delivered in refrigerated road trailers at -20C (0F) and kept
frozen until needed, at which time it is melted out by the recommended procedures. Under these conditions, frozen RUBINATE® 44 MDI should remain free of precipitated dimer and haze for approximately 14 weeks.

• The reaction of isocyanates with water leads to the formation of insoluble ureas and carbon dioxide gas which can result in pressure build-up inside closed containers.
• Therefore, extreme care must be taken to assure containers used for RUBINATE 44 MDI remain dry.
• Freshly manufactured RUBINATE 44 MDI isocyanate melts to form a clear liquid. Sedimentation is usually due to contamination from atmospheric moisture or to dimer formation. Reaction from atmospheric moisture can be prevented by storing RUBINATE 44 MDI in carefully sealed containers or under a dry nitrogen atmosphere. During handling, RUBINATE 44 MDI must also be protected from atmospheric moisture and water ingress, and containers must be purged with dry nitrogen and carefully resealed after each sampling.
• The level of formation of insoluble dimer is highly dependent upon both the temperature at which the MDI is stored and the length of time it is stored. The most practical and convenient way to store and handle purified MDI is the molten state. Bulk shipments are made in temperature-controlled road tankers at a temperature of 110-120°F (43-50°C) and is stored at 105-112°F (42°C ± 2°C) under a dry nitrogen blanket. Under these storage conditions RUBINATE 44 MDI should remain free of precipitated dimer and haze for approximately two weeks
• For small volume usage, RUBINATE 44 MDI can be delivered in drums and stored as a frozen solid. The material is delivered in refrigerated road trailers at -20°C (0°F) and kept frozen until needed, at which time it is melted out by the recommended procedures. Under these conditions, frozen RUBINATE 44 MDI should remain free of precipitated dimer and haze for approximately 14 weeks.