*Trademark of The Dow Chemical Company 

Dow Automotive and Dow Systems House are a business groups of The Dow Chemical Company and its subsidiaries. 

Page 1 of 3

Technical Data Sheet 

SPECFLEX* NM 858 Polyol 

PAPI* PB 219 Isocyanate 

Formulated Polyurethane Foam System 

Description SPECFLEX NM 858 is a fully formulated polyol used primarily for closed pour instrument panel 

applications. NM 858 may be used in combination with PAPI PB 219 isocyanate to allow for the 

production of instrument panels and interior trim parts having an applied foam density range of 120 -

140 kg/m3. 

This semi-rigid foam system has excellent processability for a variety of automotive IPIT applications 

that require good adhesion, fast cure, low VOC, very low fogging, good compatibility with PVC skins, 

and good flowability in large intricate / complicated molds. 

Typical demold times range from 60 to 80 seconds. 

Typical 

Component 

Properties 

 Unit SPECFLEX * NM 858 

Polyol 

PAPI* PB 219 

Isocyanate 

Method 

OH number MgKOH/g 51 - 57 ASTMD 4274 

Water Content % 2.6 – 2.8 ASTM E 203-92a 

Color Dark Grey Brown 

Viscosity @ 25°C cPs Yet to be measured Yet to be measured ASTM D 4878/ *D 4889 

NCO Content % Yet to be measured ASTM D 5155 

Specific Gravity 1.03 1.22 ASTM D 891 

1Recommended 

Process 

Conditions 

Please consult the Material Safety Data Sheets for detailed information on product safety handling 

and emergency procedures 

Units Values 

Poly : Iso Ratio (103-107 Index) 1.86 – 1.93 

Machine Throughput g/s Depends on equipment & customer needs; commercially utilized at 200 – 500 g/s 

Components Temperature at Head °C 29 – 35 for 721-13 poly; 27 – 32 for PB 219 iso 

Mold Temperature °C 38 - 49 

Demolding Time s 60 - 80 

De-Gas Time s 5 – 20 s after end of Rise Time 

1Values are only recommendations. Customers have utilized this foam outside of these conditions without negative effect. 

Process setups are dependant on customer requirements, part design, mold seal-off condition, carrier functionality, equipment 

limitations, etc. 

Typical Reaction 

Characteristics 

Hand mix data referred to laboratory tests made with components temperature at 25 °C, hand-mixed 

with mechanical stirrer at 2500 rpm. High pressure values will vary depending on processing 

conditions. 

Unit Hand mix High presure machine Method 

Cream Time s 5 Dow internal method 

Gel Time s 37 Dow internal method 

Rise Time s 41 Dow internal method 

Free Rise Density Kg/m3 48 Dow internal method 
*Trademark of The Dow Chemical Company 

Dow Automotive and Dow Systems House are a business groups of The Dow Chemical Company and its subsidiaries. 

Page 2 of 3

Viscosity Profiles 

Viscosity has not been measured yet

2Polymer 

 Properties 

Physical property values vary with the core density of the test pad. The tensile, tear, and elongation 

values reported below are the average of those properties at the molded density also reported below. 

The compression set and compression force deflection tests were performed on larger pads with core 

densities in the range of 70 to 100 kg/m3. All physical properties will be different at the applied 

density but can be correlated to these results based on the density difference. 

2Results are from study # 56115 performed at Dow Chemical Midland, MI USA Automotive Flexible 

Foams Lab in February 2009. 

*

Heat age conditions were 400 hours at 90 C dry heat. 

Data provided as general information only.

Units Value Standard 

Deviation 

 Method 

Molded Density (for property tests) Kg/m3 139 6.0 ASTM D3574 A 

Tensile Strength kPa 542 36 ASTM D3574 E 

Tensile Strength (heat aged)* kPa 442 ASTM D3574 K 

Elongation at break % 107 5.9 ASTM D3574 E 

Tear Strength N/m 527 56 ASTM D3574 F 

CD Compression Set 50% % Yet to measure ASTM D3574 D 

CD Compression Set 50% 

(humid aged) 

% Yet to measure ASTM D3574 D, J2 

Compression Force Deflection 

50% (humid aged) 

%change Yet to measure ASTM D3574 C, J2 

Flammability Numerical flame spread or fire classification are not intended to reflect hazards presented by this or 

any other material under actual fire conditions 

Standard Typical Values (3)

FMVSS - 302 Not yet measured 3Numerical flame spread or fire classification are only indicative, they are not sales specifications 

Handling and 

Storage 

Drums of PB 219 MDI must be protected from moisture contamination. Exothermic generation of 

CO2 may cause dangerous pressure build-up if contamination occurs. Opened containers should be 

filled with -40 C dew point inert gas before closing (nitrogen or air may be used). 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. 

 Unit SPECFLEX* NM 858 Polyol PAPI* PB 219 

Isocyanate 

Storage temperature °C 15 - 40 24 - 41 

4Shelf life / Storage stability Months 6 6 4Stored in the original sealed drums in a dry place at the recommended temperature 
*Trademark of The Dow Chemical Company 

Dow Automotive and Dow Systems House are a business groups of The Dow Chemical Company and its subsidiaries. 

Page 3 of 3

Safety 

Considerations 

Material Safety Data Sheets (MSDS) are available from the Dow Chemical Company. MSDS is 

provided to help customers satisfy their own handling, safety and disposal needs, and those that may 

be required by locally applicable health and safety regulations. SDS sheets are updated regularly. 

Therefore, please request and review the most current SDS before handling or using any product. 

Copies of the SDS are available on request through your nearest Dow Sales office. 

NM 858 Polyol - Formulated polyols generally present no significant hazard in use when simple 

precautions are followed. However, before working with these systems, it is necessary to understand 

the hazards involved in handling all of the components and to establish and follow safe work 

procedures. 

PB 219 Isocyanate - Blended 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. 

Customer Notice 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 products safety consideration. Your Dow representative can arrange the proper contacts. 

Contact information : 

For more information about PU Systems 

products, call The Dow Chemical 

Company : 

http://www.dow.com/pusystems/index.htm 

NOTICE: The information and data contained herein do not constitute sales 

specifications. The product properties may be changed without notice. No liability, 

warranty or guarantee of product performance is created by this document. It is 

the Buyer’s responsibility to determine whether Dow products are appropriate for 

Buyer’s use and to ensure that Buyer’s workplace and disposal practices are in 

compliance with applicable laws and regulations. No freedom from any patents or 

other industrial or intellectual property rights is granted or to be inferred. Quality Management System certified by DQS 

against DIN EN ISO 9001 

Reg. No. 055759 QM