polymeric isocyanate (MT-44V20)
General Properties and Applications
MT44V20 is a liquid, dark brown polymeric isocyanate based on diphenylmethane-4,4′-diisocyanate (MDI) with isomers and homologues of higher
functionality. It is used in conjunction with polyols to produce polyurethane.
Sampling
Exposure to moisture must be prevented when taking product samples
Storage
Recommended storage temperature: + 10 to + 30 °C (in exceptional cases up to 50°C)
Storage stability (ex works): 6 months if stored in moisture-tight drums Labeling and REACH applications This product data sheet is only valid in conjunction with the latest edition of the corresponding Safety Data Sheet. Any updating of safety-relevant information – in accordance with statutory requirements – will only be reflected in the Safety
Data Sheet, copies of which will be revised and distributed. Information relating to the current classification and labeling, applications and processing methods and further data relevant to safety can be found in the currently valid Safety Data Sheet.
Directions for Processing
MT44V20 may undergo partial crystallization at temperatures below 0 °C. The product can, however, be brought back into the liquid state by heating the entire contents of the drum for a short time to a maximum of 70 °C, although this may lead to an increase in the solids content.
Drums including empty ones should always be kept tightly sealed. The product should never be allowed to come into contact with water, which reacts with MT44V20 to form polyureas and carbon dioxide.Contact with water in any form (damp drums, solvents containing water, moist air) must be prevented not only during storage, but also when removing material from drums and during processing.Failure to do so may lead to a dangerous build up of pressure in tanks and drums due to the generation of carbon dioxide. In addition, polyureas forming in MT44V20can cause solids to separate out, leading to blockages in the filters, pumps and pipelines of the processing equipment and resulting in production problems.
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