Papi 27 174k9

Product Information

PAPI 27 Polymeric MDI PAPI 27 POLYMERIC MDI PAPI* 27 polymeric MDI is a polymethylene polyphenylisocyanate that contains MDI. This product has a narrow molecular weight distribution and a high reactivity. Applicable to many foam processes, this product is compatible with rigid polyether and polyester polyols, making it suitable for a full range of low- to high-density semi-rigid foams, rigid foams and structural RIM processing. 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.

APPLICATIONS • Appliance foams • Portable coolers • Automotive interior foams • Furniture • Building s • Spray insulation • Structural foams • Refrigerated truck insulation • Insulated doors

TYPICAL PROPERTIES Properties Average molecular weight “Functionality”2 Isocyanate equivalent weight3 NCO content by weight, %3 Viscosity, s @ 25°C3 (77°F) Typical viscosity growth, s/mo. @ 25°C4 (77°F) Vapor pressure, mm Hg @ 25°C (77°F) Decomposition point °C (°F) Extrapolated boiling point, °C (°F) Flash point, °C, ASTM D 93 Closed Cup (°F) Acidity, % as HCl3 Density, g/ml @ 25°C (lb/gal. @ 77°F) Coefficient of thermal expansion, kg/l/1°C Specific heat, gm•cal/gm•°C Thermal conductivity, gm•cal/cm•sec•°C 1 2 3 4

340 2.7 134.0 31.4 150-220 5-10 <10-5 230 (446) 330 (626) >204 (>400) 0.017 1.23 (10.3) 0.0008 0.43 0.0003

Not to be construed as specifications. Not true functionality, but typifies expected cross-link densities in end use applications. For test procedures, see Technical Bulletin 109-761, “PAPI Polymeric MDI, Test Procedures.” Under recommended handling conditions.

*Trademark of The Dow Chemical Company Dow Plastics, a business group of The Dow Chemical Company and its subsidiaries. LOES No. 026-00011

Typical Value1

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PAPI 27 Polymeric MDI Viscosity vs. Temperature 1000

Viscosity, s

100

10

1 0

25

50

75

100

125

40 50 60 70 80 90 100 Temperature, °C

120 140

Temperature, °C

Vapor Pressure vs. Temperature

Vapor Pressure, mm Hg

0.1

0.01

0.001

0.0001

0.00001

0.000001

0.0000001 0

10

20

30

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Form No. PA-26-333-0301

SAFETY CONSIDERATIONS

Handling

Melting Instructions

PAPI polymeric MDI products are potentially hazardous materials and require care in handling. All persons who work with these materials must know and follow proper safe handling procedures. Current Material Safety Data Sheets (MSDS) and additional information about the safe handling, storage and use of these materials are available through your Dow representative. Dow MSDS may be obtained from the head office of Dow Chemical Pacific Limited by calling (852) 2879-7333. Please request and review the information before handling these materials.

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.

If drum shipments of polymeric or modified MDI products arrive in a crystallized, frozen or fused state, they should be promptly unloaded and heated as soon as possible. Polymeric, pure and modified MDI products that have been frozen will exhibit the same dimerization characteristics as pure MDI. Unless proper action is taken to heat or melt the product, dimerization will proceed rapidly and deteriorate both the clarity and assay of the product. While several methods for melting frozen or crystallized MDI have been developed, the method of choice should be one in which dimer formation is minimized. This can best be accomplished by rapid, even heating of the drums, as follows. The preferred method for heating drums is “drum rolling” (usually at 5 rpm on a mechanical drum roller) in atmospheric steam. The principal advantage of this method is that it permits efficient heat transfer - that is, the solid MDI crystals cool the liquefied material so that the contents are not heated much beyond 70°C (158°F), the point at which dimer formation can increase significantly. Experience has shown that a frozen drum of polymeric, pure and modified MDI, with a temperature between -4° to 32°F (-20° to 0°C) will usually melt completely (i.e., reach 70°C [158°F] in approximately four to five hours). Also, while 70°C (158°F) is significantly higher than the recommended storage and handling temperature, it is necessary to reach this temperature, at least briefly, in order to melt the product both quickly and thoroughly. Before heating, any opened drums should be reblanketed with dry nitrogen (-40°F [-40°C] dew point) and all drums, previously opened or not, should have bungs tightened securely.

SAFETY PRECAUTIONS First Aid Polymeric MDI is irritating to the respiratory tract and can cause respiratory and skin sensitization in susceptible individuals. Although vapor pressure is low, there is the possibility that the polymeric MDI may exist in aerosol droplets which may provide air concentrations that would be hazardous upon single exposure. These effects may be delayed. Decreased ventilatory capacity has been associated with exposure to similar isocyanates; it is possible that exposure to MDI may cause similar impairment of lung function. In case of inhalation exposure, remove to fresh air. Consult medical personnel. Polymeric MDI may cause eye and skin irritation. Because of its high viscosity, this material may be difficult to remove from the eyes. In case of eye , irrigate immediately and continuously with water for at least 15 minutes. Consult medical personnel. In case of skin , wash off material in flowing water or shower. Remove contaminated clothing immediately and launder before reuse. Destroy contaminated shoes and leather items. The single dose toxicities of polymeric MDI is low. If ingested, do not induce vomiting. Consult medical personnel.

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. Shipping and storage temperatures for this product are 75° to 105°F (24° to 41°C). 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.

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Form No. PA-26-333-0301

Upon removal from the steam chest, residual heat will usually evaporate free water from the drum head. In any event, the top of the drum should be wiped with a dry cloth. As can be seen, agitation and even heating is the key to maintaining quality during melting. Dow does not recommend static melting in hot-air oven or with electric heating apparatus, or by hot-water bath. CAUTION: The “drum rolling” procedure should be carefully monitored to prevent bumping, rubbing or other conditions that could puncture or otherwise damage the drums.

Fire Suitable fire extinguishing agents include dry chemical powder, carbon dioxide or chemical foam. Isocyanates will burn but do not ignite easily. In the event of a fire, toxic vapors and decomposed material are likely to be present. All fire fighters

FOR MORE INFORMATION

should be equipped with protective clothing and a positive pressure, selfcontained breathing apparatus. Drums of isocyanate involved in a fire should be sprayed with water to minimize the risk of rupture. However, water contamination in a closed container or a confined area is to be avoided, due to exothermic CO2 evolution upon water contamination.

For additional information about MDI products, consult the Safe Handling and Storage of MDI-Based Isocyanates handbook (Form No. 109-01224) from Dow or Dow Chemical Pacific Limited at (852) 2879-7333 (Hong-Kong). Also review the current MSDS for this product.

Spills and Disposal

Customer Notice

In case of spills, evacuate and ventilate the spill area. Only properly trained and protected personnel should be involved in the spill cleanup and waste disposal operations. Spills can be covered with a commercial absorbent or sand, shoveled into open containers, properly labeled and removed from the work area for decontamination with a solution of 95 percent water, 5 percent ammonium hydroxide. Waste disposal of isocyanates should always be in accordance with federal, state and local environmental laws and regulations.

Dow encourages its customers to review their applications of Dow products from the standpoint of human health and environmental quality. To help ensure that Dow products are not used in ways for which they were not intended or tested, Dow personnel are willing to assist in dealing with ecological and product safety considerations. Your Dow representative can arrange proper s.

For additional information in Asia Pacific, call (852) 2879-7333. Notice: No freedom from any patent owned by Seller or others is to be inferred. Because use conditions and applicable laws may differ from one location to another and may change with time, Customer is responsible for determining whether products and the information in this document are appropriate for Customer’s use and for ensuring that Customer’s workplace and disposal practices are in compliance with applicable laws and other governmental enactments. Seller assumes no obligation or liability for the information in this document. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED. Published March 2001.

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Printed in Hong Kong. *Trademark of The Dow Chemical Company Dow Plastics, a business group of The Dow Chemical Company and its subsidiaries.

Form No. PA-26-333-0301