July 1999 TECHNICAL DATA SHEET

Cancels and replaces SIL 96 232 3

Description A silicone master-batch, which is hot curing after addition of a

cross-linking agent (chosen according to the transformation

method).

Special properties · No replastifying

· No post-curing

· Low shrinkage

· Low compression set

· Good heat resistance, up to 200 °C

· Low swelling in paraffin or slightly aromatic oils

· Bright colours easily obtained

Characteristics Type (in accordance with AFNOR T 40 002) ........................... MVQ

Density at 25 °C, approx. .............................................. ............ 1.09

Natural colour ......................... ..................... colourless, transparent

Properties after

working

After addition of 0.9 % of 2-4 dichloro benzoyl peroxide (at 50 %)

curing for 8 minutes at 115 °C (1).

After addition of 0.6 % of 2,5 dimethyl 2,5 bis (tertiobutylperoxy)

hexane at 75 %, curing for 10 minutes at 170 °C (2).

1. Mechanical properties (1) (2)

Shore A hardness, approx. ......................

Tensile strength, MPa, approx. ................

Elongation at break, %, approx. ...............

Secant modulus at 100 % elongation,

MPa, approx. ...........................................

Tear strength, kN/m, approx. ...................

Compression set (22 h / 177 °C / 25 %), %,

approx. ....................................................

Rebound resilience, %, approx. ...............

Linear shrinkage, %, approx. ...................

44

7

380

1.29

12

17

68

2.15

42

7.60

475

0.98

12

8

64

3.80

Properties after

working (cont.)

2. Heat stability

2.1. Properties after ageing over 7 days at 177 °C

Shore A hardness, approx. ......................

Tensile strength, MPa, approx. ................

Elongation at break, %, approx. ...............

(1)

45

6.8

365

(2)

43

6.8

410

2.2. Properties after ageing over 3 days at 200 °C

Shore A hardness, approx. ......................

Tensile strength, MPa, approx. ................

Elongation at break, %, approx. ...............

44

7.1

370

44

6.5

380

2.3. Properties after ageing over 10 days at 200 °C

Shore A hardness, approx. ......................

Tensile strength, MPa, approx. ................

Elongation at break, %, approx. ...............

42

6.9

360

44

6.10

315

3. Oil resistance

3.1. Variation of properties after immersion for 70 hours at 150 °C in

ASTM 1 oil

Shore A hardness, approx. ......................

Tensile strength, MPa, approx. ................

Elongation at break, %, approx. ...............

Volume, %................................................

- 8

- 2

+ 10

+ 4

- 10

- 23

- 12

+ 4

3.2. Variation of properties after immersion for 70 hours at 150 °C in

ASTM 2 oil

Shore A hardness, approx. ......................

Tensile strength, MPa, approx. ................

Elongation at break, %, approx. ...............

Volume, %................................................

- 15

- 11

+ 20

+ 8

- 15

- 30

- 6

+ 9

Applications Producing articles with good compression set.

Producing articles exposed to oils (with or without insert).

Use in blends with MASTER BATCHES of greater hardness

(coating of cylinders, etc.).

Packaging RHODORSIL MF 240 U is delivered in 25 kg reinforced cardboard

boxes or in 500 kg containers.

Storage and

shelf life

RHODORSIL MF 240 U may be stored in its original unopened

packaging at a temperature below 40 °C for up to 18 months from

the date of manufacture marked clearly on the packaging.

Past this date, Rhodia Silicones no longer guarantees that the

product meets the sales specifications.

Safety Consult the Safety Data Sheet for RHODORSIL MF 240 U.

Warning to users The information contained in this document is given in good faith

based on our current knowledge. It is only an indication and is in no

way binding, particularly as regards infringement of or prejudice to

third party rights through the use of our products.

RHODIA SILICONES GUARANTEES THAT ITS PRODUCTS

COMPLY WITH ITS SALES SPECIFICATIONS.

This information must on no account be used as a substitute for

necessary prior tests which alone can ensure that a product is

suitable for a given use.

Users are responsible for ensuring compliance with local legislation

and for obtaining the necessary certifications and authorisations.

Users are requested to check that they are in possession of the

latest version of this document and RHODIA SILICONES is at their

disposal to supply any additional information.