NINGBO INNO PHARMCHEM CO.,LTD. provides Polymeric MDI PM-200, a fundamental chemical for numerous industrial applications. Understanding its properties and best practices for handling is crucial for optimal performance and safety. This guide offers detailed information on the characteristics and storage of this versatile brown liquid isocyanate.

Polymeric MDI PM-200 is a diisocyanate-diphenylmethane (MDI)-based composition. Its appearance is a characteristic brown liquid at ambient temperatures. Key chemical properties include an NCO content typically ranging from 30.5-32.0%, which indicates its reactivity and suitability for polymerization reactions. The viscosity at 25°C is generally between 150-250 mPa·s, contributing to its favorable flowability, a significant advantage in many processing applications, including those requiring isocyanate for rigid PU foam.

The product's density at 25°C is in the range of 1.220-1.250 g/cm³, and its acidity content is maintained at a low level, typically less than or equal to 0.030%. These specifications ensure consistent performance and minimize potential side reactions.

Proper storage is paramount to maintaining the quality and shelf life of Polymeric MDI PM-200. As a reactive chemical, it readily reacts with atmospheric moisture, leading to the formation of insoluble ureas and carbon dioxide gas. This can cause pressure build-up in sealed containers and increase product viscosity. Therefore, containers must be kept absolutely dry and carefully sealed, preferably under nitrogen, after opening.

Containers of Polymeric MDI PM-200 should be stored indoors in a well-ventilated area at ambient temperatures, ideally between 15-35°C. Storage at temperatures below 5°C may lead to crystallization. If crystallization occurs, the material should be gently heated by rolling the drum in a hot air oven at 70-80°C to melt it out, followed by thorough agitation before use. Melting in a water bath is not recommended due to the risk of moisture contamination. Extended storage above 50°C is also discouraged as it can lead to the formation of insoluble solids and increased viscosity.

The shelf life of Polymeric MDI PM-200, under recommended storage conditions, is typically one year from the date of production. For manufacturers looking to buy Polymeric MDI PM-200, understanding these properties and adhering to storage guidelines ensures they can reliably source and utilize this crucial material for applications such as MDI based composition for insulation and beyond.

NINGBO INNO PHARMCHEM CO.,LTD. is dedicated to providing high-quality chemicals and comprehensive support. Contact us for your Polymeric MDI PM-200 requirements and expert advice.