# SPECFLEX TM NF 857 DA Polyol (LD821)

SPECFLEX NE 447 Isocyanate

Description

SPECFLEX NF 857 Polyol and SPECFLEX NE 447 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. It is

suitable for the production of automotive dual

- hardness backrest as the

hard side.



## Typical Component Properties

Units SPECFLEX NF

857 Polyol SPECFLEX

NE 447

Isocyanate Test Method

Viscosity, 25°C Mpa.s 2300

- 2400 (Lab

Data) 15 ASTM D 445

Specific Gravity,

25/25°C - 1.04 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 857 Polyol pbw 100

SPECFLEX NE 447

Isocyanate pbw 39

- 50

Component Temperature

(Pol/ISO) °C 24

- 26

Typical Molds Temperature °C 60

- 65

Demolding Time Min 5

- 6



## Typical Reaction Characteristics

Units High

Pressure

Machine

Cream Time s 10

- 12

Rise Time s 70

Free Rise Density

(Core) kg/m 3 31

(Lab Data) 

# Handling and Storage

The Isocyanate component must be stored in liquid state. In case of

crystallization, it has to be melted by heating the dru m at 60

- 70 °C for

no more than 24 hours.



## Handling and Storage

Units SPECFLEX

NF 857

Polyol SPECFLEX

NE 447

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

that recommended temperature protected from direct

sunlight



# Typical Polymer Properties

These items are provided as general information only.

Units Values Test

Method

Index 95 100 100 100 105

Core density kg/m 3 39.2 36.8 38.5 40.8 39.1 JIS K 6400

Tensile

strength kg/cm 2 1.65 1.66 1.74 1.81 1.77 JIS K 6400

Elongation % 110 110 105 105 103 JIS K 6400

Tear Strength kg f /cm 0.57 0.6 0.59 0.6 0.58 JIS K 6400

Ball

Resilience % 68 68 68 68 68 JIS K 6400

Dry set % 3.1 3.0 2 .6 2.7 2.6 JIS K 6400

Wet set % 10.5 11.2 10.2 10.1 10.1 JIS K 6400

25% ILD kg/ cm 2 18.0 18.3 21.94 25.6 24.65 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)

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 an d 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 d ealing 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 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



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SPECFLEX NF 857 Polyol / Polyurethane Systems House