®TMTrademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow Form No: 751

- 1 02

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# SPECFLEX TM NF 748 Polyol

SPECFLEX TM 

# NE 4 47 Isocyanate

Description

SPECFLEX NF 748 Polyol and SPECFLEX NE 4 47 Isocyanate is a

TDI/MDI based polyurethane flexible system with a final molded

density of 36

- 50 kg/m 3 

### . The product is designed for short demolding

time. It is suitable for the production of large and small moldings,

especially for automotive backrest applications

.



## Typical Component Properties

Units SPECFLEX NF

748 Polyol SPECFLEX

NE 4 47

Isocyanate Test Method

Viscosity, 25°C Mpa.s 1640

- 2460 15 ASTM D 445

Specific Gravity,

25/25°C - 1.03 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 748 Polyol pbw 100

SPECFLEX NE 4 47

Isocyanate pbw 40

- 55

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 9

- 11

Rise Time s 90

Free Rise Density

(Core) kg/m 3 32.3 

## Handling and Storage

Units (1) SPECFLEX

NF 748

Polyol SPECFLEX

NE 4 47

Isocyanate

Storage Temperature °C 15

- 25 15

- 25

Storage Stablility /

Shelf Life (1) - 1.03 1.22 ASTM D

891

1. Stored in the original seale d 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 85 85 95 95 105 105

Core density Kg/m 3 30.9 36.1 31.1 36.4 31.1 36.2 JIS K 6400

Tensile

strength Kg/cm 2 1.15 1.52 1.25 1.53 1.29 1.65 JIS K 6400

Elongation % 115 125 108 110 90 98 JIS K 6400

Tear Strength kg f /cm 0.6 0.67 0.58 0.77 0.62 0.65 JIS K 6400

Ball

Resilience % 63 64 64 65 62 64 JIS K 6400

Dry set % 5.2 5.1 4.6 4.0 5.2 4.2 JIS K 6400

Wet set % 13.3 11.2 11.7 9.8 12.2 9.8 JIS K 6400

25% ILD kgf/314cm 2 8.5 12.1 10.5 15.0 13.5 18.8 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 specifications. These 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 healt h

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 t he

proper contacts.

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

propertie s 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 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



### www.dow automo ti ve .com Quality Management System certified by DQS against DIN EN

ISO 9001

– Reg. No. 055759 QM



### Dow Automotive Systems | 1250 Harmon R oad| Auburn Hills, MI 48326 US Form No . 751

- 12701 02

- 2011/kh



### Tel.+1 248 391 6300 | Fax +1 248 391 6417 | Email: dowautomotive@dow.com Page 2 of 2

®TMTrademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow