# SPECFLEX TM NF 749 Polyol

SPECFLEX TM 

# NE 4 47 Isocyanate

Description

SPECFLEX NF 749 Polyol and SPECFLEX NE 4 47 Isocyanate is

a TDI/MDI based polyurethane flexible system w ith a final molded

density of 40

- 50 kg/m 3 

### . The product is designed for short

demolding time and for both open and closed pour processing. It

is suitable for a multiplicity of molded part sizes. The product

is designed as the hard foam used in dual hardness backrest

applications for the automotive market

.



## Typical Component Properties

Units SPECFLEX

NF 749

Polyol SPECFLEX

NE 4 47

Isocyanate Test

Method

Viscosity, 25°C Mpa.s 2700

- 4100 15 ASTM D

445

Specific Gravity,

25/25°C - 1.0 4 1.22 ASTM D

891



# Recommended Process Conditions

Polyol needs to be properly mixed before use. Molds must be

treated with a proper release agent.



## Recommended Process Conditions

Units Limits

SPECFLEX NF 749 Polyol pbw 100

SPECFLEX NE 4 47

Isocyanate pbw 42

- 5 2

Component Temperature

(Pol/Iso ) °C 20

- 25/20

- 25

Typical Molds Temperature °C 60

- 65

Demolding Time Min 4

- 6



## Typical Reaction Characteristics 1

Units High

Pressure

Machine

Cream Time s 1 0

- 12

rise Time s 90

Free Rise Density

(Core) kg/m 3 28.5 

## Handling and Storage

Units (1) SPECFLEX

NF 749

Polyol SPECFLEX

NE 4 47

Isocyanate

Storage Temperature °C 15

- 25 15

- 25

Storage Stablility / Shelf

Life (1) Months 6 6

1. Stored in the original sealed container in a dry place

at the recommended temperature protected from

direct sunlight



# Typical Polymer Properties

These items are provided as general information only.

Units Values Test

Method

Index 95 95 105 105 110 110

Core

density k g/m 3 35.7 41.5 35.8 40.6 34.1 41.7 JIS K

6400

Tensile

strength k g/cm 2 1.9 2.38 1.85 2.2 1.85 2.45 JIS K

6400

Elongation % 90 88 80 80 78 78 JIS K

6400

Tear

Strength kg f /cm 0.66 0.8 0.7 0.74 0.66 0.78 JIS K

6400

Ball

Resilience % 59 59 58 58 55 55 JIS K

6400

Dry set % 5.8 5.8 5.7 5.2 6.0 5.2 JIS K

6400

Wet set % 22.2 20.2 22.2 17.9 21.7 19.0 JIS K

6400

25% ILD kgf/314cm 2 20.49 28.93 25.61 31.04 25.41 38.67 JIS K

6400



# Typical Polymer Fire Behavior

Numerical flame spread or fire classification s are not intended to reflect

hazards presented by this or any other material under actual fire conditions

.



## Typical Polymer Fire Behavior

Standard Typical Values (1)

F MVSS 302 Pass

UNI CT 225 Pass

1. Numerical flame spread or fire classifications are only

indicative; they are not sales specification. These results

are obtained from tests in Dow laboratories on polymer lab

specimens.

# Safety Considerations: Material Safety Data (MSD)

sheets are available from The Dow Chemical Company. MSD

sheets are 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.

MSD sheets are updated regularly, therefore, please request

and review the most current MSD sheet before handling or

using any product. These are available from the nearest Dow

sales office.



# Customer Notice: Dow encourages its customers to

review their application 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 will assist customers in

dealing with ecological and products safety. Your Dow Sales

representative can arrange the proper contacts.

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 com pliance with applicable laws and

regulations. No freedom from any patent owned by Seller or others is to be inferred.

C o n t a c t I n f o r m a t i o n : F o r m o r e i n f o r m a t i o n a b o u t P U S y s t e m s p r o d u c t s ,

c a l l T h e D o w C h e m i c a l C o m p a n y : h t t p : / / w w w . d o w . c o m / p u s y s t e m s / i n d e x . h t m



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SPECFLEX NF 749 Polyol / Thermoset Systems