Enhanced TDS
Identification & Functionality
- Chemical Family
- Chemical Name
- Tilley Product Number
- Technologies
- Product Families
Features & Benefits
Applications & Uses
- Markets
- Applications
- Base Chemicals End Uses
Properties
- Physical Form
- Typical Properties
Value Units Test Method / Conditions Average Molecular Weight 340 - - Functionality2 2.7 - - Isocyanate equivalent weight3 134 - - NCO Content 31.4 % - Viscosity (at 25°C) 150 - 220 cPs - Typical Viscosity Growth (at 25°C) 5 - 10 cps/mo. - Vapor Pressure (at 25°C) max. 10⁻⁵ mmHg - Decomposition point 230 °C - Extrapolated boiling point 330 °C - Flash Point min. 204 °C ASTM D 93 Closed Cup Acidity (as HCl₃) 0.017 % - Density (at 25°C) 1.23 g/ml - Coefficient of thermal expansion 0.0008 kg/l/1°C - Specific Heat 0.43 gm•cal/gm•°C - Thermal conductivity 0.0003 gm•cal/cm•sec°C - - Note
- NOTE: To maintain product quality and easy handling, this product must be stored between 75° to 105°F (24° to 41°C). Shipping and storage temperatures vary with conditions; see Storage section.
- 2Not true functionality but typifies expected cross-link densities in end use applications.
3For test procedures, see Technical Bulletin 109-761, “PAPI Polymeric MDI Test Procedures.”
4Under recommended handling conditions.
Regulatory & Compliance
- Certifications & Compliance
- Chemical Inventories
Storage & Handling
- Storage & Handling Information
Handling : Workers should wear appropriate eye protection (safety glasses are considered a minimum requirement and if there is the possibility of exposure to the eyes, it is recommended that chemical goggles be worn) and protective clothing impervious to MDI whenever MDI is used. General or local exhaust ventilation should be provided to control airborne levels below the exposure guidelines. Please review the MSDS for this information. The vapor pressure of MDI is low at room temperature (< 1 X 10-5 mm Hg). However, at temperatures over 104°F (40°C), the vapor pressure increases enough that low functionality MDI products begin to constitute a toxic hazard. Aerosol mists can also be a problem.
Storage : Drums of pure and polymeric MDI must be protected from moisture contamination. Exothermic generation of CO2 may cause dangerous pressure build-up if contamination occurs. Store drum under a pad of -40°F (-40°C) dew point nitrogen or if nitrogen is unavailable, a pad of -40°F (-40°C) dew point air may be used. Opened containers should be filled with this inert atmosphere before closing. During drum unloading, the 3/4” vent may be equipped with a dry inert gas breather (maximum of 1 psig pressure) or a moisture free, calcium chloride-filled dryer tube placed in the air bleed opening.If shipping or storage temperature should fall below 65°F (18°C), some crystallization could result. Unless proper action is taken to re-form the original solution, subsequent dimerization will proceed quickly and will deteriorate the assay of the product.