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smlogo.jpg (882 bytes)            Polysulphide Rubber Moulding Compounds
 

SMOOTH-ON MOULD COMPOUNDS - FMC Series

DESCRIPTION:

The Smooth-On F.M.C. Series is a range of two component compounds which when mixed cure to a flexible solid intended for use as flexible moulds.

Such moulds have negligible shrinkage, give excellent detail and are ideal for casting wax, plaster and cementitious compounds. They may also be used for short run casting with resins producing low exotherms.

Main advantages of F.M.C. compounds are their ease of use and their ability to cure in extremely damp conditions thus making them ideal for sculpture casting. Their low modulus characteristics allow easy de-moulding even on extremely delicate patterns.

Hardness and flexibility vary according to the specific product selected. Pot life and cure depend on the catalyst used i.e. fast or standard. These products should be used at room temperature.

F.M.C.100 is light tan in colour and is used for casting white plaster without staining.

F.M.C.200 is a black compound used mainly in foundry and pattern work.

F.M.C.201 is a softer and more flexible version of F.M.C.200 and is ideally suited to lost wax casting.

F.M.C.204 is the softest of the F.M.C. series for use with extremely delicate masters and patterns.

F.M.C.301 is a brushable thixotropic grade used for the production of skin or blanket moulds - see Page 2. This provides a practical and economical method of producing large moulds or those made insitu on walls and celings.

PHYSICAL PROPERTIES
UNCURED F.M.C.
 

100

200

201

204

301
           

Mix by Weight A : B

100:6

100:8

100:8

10:1

100:8

Initial Viscosity CPS

16000

14000

12000

6000

PASTE

Approx Pot Life Mins

FAST– 20 mins STD – 45 mins

Demould Time

SEE UNDER CURE-RECOMMENDED PROCEDURE
           

CURED (after 16 hrs)

          

Specific Gravity

1.50

1.35

1.35

1.32

1.39

Shore Hardness

25

30

20

7

25

100% Modulus kg/cm2

3.37

2.04

1.55

0.91

5.48

Elongation at Break %

450

700

950

1150

650

Tensile Strength kg/cm2

19.6

28.00

21.8

14.6

40.3

RECOMMENDED PROCEDURE

MODEL PREPARATION - Models made out of most common materials such as wood, plaster, plasticine or plastics (not polystyrene) do not normally require any release agents, but it is usually necessary to use a release agent with certain metals such as copper or brass and for ease of parting from delicate masters. In such instances use Sonite Seal Release. Porous surfaces should be adequately sealed.

MIXING - Before mixing the two components, stir catalyst well, since it tends to settle out during storage. Thorough mixing is essential and the sides of the container should be scraped down several times. Quantities of more than 1 gallon should be power mixed using a slow speed drill up to 300 R.P.M.

CURE - Both pot life and rate of cure are dependant on catlyst used, either fast or standard, but in addition are also affected by humidity and temperature. An increase in both will decrease pot life and cure time. At 25 degrees centigrade, 50% relative humidity and standard cure de-moulding can take place after 12 hours.

CASTING - Release agents are not required for wax. However, mould life will be increased by using a detergent solution when continuously casting plaster and cement. For short run low exotherm resin compounds such as polyester, epoxy or polyurethane, a film forming release agent such as Polyvinyl Alcohol must be used. This should be sprayed on to produce a continuous film, allowed to dry then sprayed with a silicone release agent.

BLANKET MOULD PRODUCTION WITH F.M.C.

For larger moulds, economies on material can be made using a butter-on (thixotropic) grade to produce a blanket mould. This also has considerable advantages when taking moulds from masters insitu on walls and ceilings.

1. Prepare master in normal way.

2. Brush on a thin coat of F.M.C.200. Allow this to become tacky then butter-on 1/8" to 3/16" of F.M.C.301. An additional coat should be applied to moulds which do not require reinforcement. Allow F.M.C. to cure, apply Sonite Seal Release and trowel on plaster backing.

3. For large moulds hessian or glass fibe reinforcement should be used to add strength and dimensional

stability. As soon as the first coat of F.M.C. 301 has been applied, place small pieces of reinforcement over the entire surface. Additional F.M.C.301 may be necessary to fill all the reinforcement and provide a smooth back surface.

4. If the F.M.C. blanket mould is to become an integral part of the plaster backing, reinforcement can be

partly embedded in the final coat of F.M.C.301 prior to application of the plaster mix.

STORAGE

F.M.C. has over one year shelf life if unopened. However, we do not advise the use of cure which has been stored for long periods as irreversible separation takes place.

HEALTH AND SAFETY

F.M.C. Catalyst (Part B) contains lead which should not be ingested. Avoid repeated skin contact and wash skin with soap and water. In case of eye contamination wash with water and call doctor. Keep away from children.

DISCLAIMER

Information in this technical sheet is to the best of our knowledge accurate. The company cannot accept any responsibility for loss or damage that may result from the use of this information.. Users are advised to confirm suitability of this product by their own tests.

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