SILICONES

Silicone for casting

About silicone for casting

The METACONCEPT Group, a specialist in the manufacture of tin-based alloys for the production of parts via centrifugal processes for use in the jewellery and silverware industries, has joined forces with NICEM (Italy), the leading European manufacturer of centrifugal casting equipment and elastomers for these applications.

We can offer a range of unique services to our clients:

  • We offer the best alloys on the market (lead-free alloys with a maximum of 50 ppm). Please refer to our arts and crafts alloy datasheet.
  • We distribute a range of very high quality elastomers which are equally suitable for the creation of tin, zamak or polyester resin parts.
  • We supply our clients with all the accessories necessary for the creation and preparation of moulds, such as talc, centring pins, ladles and gouges.
  • We keep our clients informed of the latest centrifugal casting lines produced by NICEM and offer them equipment tailored to their needs.

 

The METACONCEPT Group also boasts a technical laboratory (with a full centrifugal line) where it offers training in the creation of silicone moulds.

Below you will find details of our silicone product lines + accessories. We can supply specific commercial and technical datasheets for all our centrifugal casting and mechanical polishing equipment (mass finishing).

 

We also offer organic silicones and rubbers for the creation of moulds for lost wax casting..

silicones1

silicones2

Characteristics of silicones

Designation
Shores hardness / Hardness
% shrinkage
Type of production
Mechanical properties
Resistance to temp.
Pressure – Vulcanisation (bars)
Silicone disc
Black Jack
58 / 60
2.0
Parts with large
undercuts
Average malleability when raw, very high tensile strength, good flexibility
High
150
Silicone disc
White B70
68 / 70
2.0
Parts with small
undercuts
Poor malleability when raw, average tensile strength, average flexibility
Higth
110 – 130
Silicone disc
Light blue BA 65 HT
65 / 67
2.3
Parts with medium
underctus
High malleability when raw, very high tensile strength, very good flexibility
Very high
110 – 130
Silicone disc
Dark blue SB55HT
55
2.3
Parts with a very
large undercut
Average malleability when raw, very high tensile strength, very good flexibility
Higth
110 – 130
Silicone disc
Yellow G55
58 / 60
2.3
Parts with large
undercuts
High malleability when raw, very high tensile strength, very good flexibility
Medium
110 – 130
Silicone disc
white SB55
(with additive)
53 / 55
2.0
Parts with medium
undercuts
Average malleability when raw, average tensile strength, average flexibility
Medium
110 – 130
Silicone disc
Green SB50HT
49 / 51
2.0
Parts with a very
large undercut
High malleability when raw, very high tensile strength, very good flexibility
Hight
110 – 130
Bi-composite silicone
HT33 A – with
HT33B
NC
NC
All types of parts for
gravity casting
Cold silicone for the creation of moulds used for manual casting
Medium
N/A
Silicone block
A32 – Orange bloc 2 k
32
0.8
Used for inserts
High malleability when raw, very high tensile strength, very good flexibility
Higth
110 – 130

Vulcanisation time: 2 mm per mm of thickness (minimum duration 1 hour)
Vulcanisation temperature: 180°

 

Designation
Shores / Hardness
Shrinkage in %
Type of production
Mechanical properties
Resistance
to temp.
Specific
pressure on the
rubber
Silicone disc Green SB 50 / 99
50 / 52
0.50
Duplication of plastic, wood resin and wax models
Average malleability when raw, very high tensile strength, very good flexibility
Hight
50 – 60
Silicone plate antique Rose
50 / 53
0.35
Wax injection for lost wax casting
High malleability when raw, very high tensile strength, very good flexibility
Hight
110 – 130

Vulcanisation time: 2 mm per mm of thickness (minimum duration 1 hour)
Vulcanisation temperature: 82°C to 100°C
Storage period:12 months in dry conditions away from direct sunlight.

These tables show the most commonly used silicones in the area of centrifugal casting:
Have you defined the type of application? Contact us.Our technical staff will be happy to assist you in choosing the most suitable silicones.

ACCESSORIES FOR SILICONES

Name
Use
Special characteristics
Mould boxes
For the preparation and vulcanisation of silicone moulds
Available in diameters of 230 mm to 700 mm and 3 heights.
Centring pin
For the positioning and centring of 2 silicone discs
In square or conical form and in heights of 13 mm or 17 mm.
Sleeves and cutter blades
For the preparation of mould feeding channels
Several sizes available
Sleeves and gouges
For the preparation of mould feeding channels
Several sizes available There is a pocket with the 4 most frequently used instruments for preparing the mould.
Talc
Prevents sticking when casting the metal in the silicone mould
Talc with a neutral Ph and a specific granulometry of 2.5% at 5μ. This talc contains no silicone, Do not use talc bought from a pharmacy as this may contaminate the silicone.
Silicone wire
Used as a flexible insert inside the 2 silicone discs
Several diameters available
Teflon wire
Used as a rigid insert inside the 2 silicone discs
Several diameters available
Ladles
For pouring the molten metal into the centrifuge
Stainless steel, 5 sizes available
Buffers FIPA
For the manual buffing of parts manufactured via centrifugal processes
Available in 180 g – 220 g – 400 g – 600 g and diameters of 20 x 160 mm or 10 x 120 mm.

 

Applications

NameUseSpecial characteristics
Silicone disc Black JackTin and polyester resinAvailable in Ø 230 mm, 300 mm and 400 mm
and thicknesses of 5 mm – 10 mm – 15 mm
Silicone disc White B65TinAvailable in Ø 230 mm – 300 mm and 400 mm
and thicknesses of 5 mm – 10 mm – 15 mm
Silicone disc White B70Tin and zamakAvailable in Ø 230 mm – 300 mm and 400 mm
and thicknesses of 5 mm – 10 mm – 15 mm
Silicone disc Light blue BA 65 HTTin and zamakAvailable in Ø 230 mm – 300 mm and 400 mm
and thicknesses of 5 mm – 10 mm – 15 mm
Silicone disc Dark Blue SB55HTTinAvailable in Ø 230 mm – 300 mm and 400 mm
and thicknesses of 5 mm – 10 mm – 15 mm
Silicone disc Fuchsia A 50Tin and resin for lost wax castingAvailable in Ø 230 mm – 300 mm and 400 mm
and thicknesses of 5 mm – 10 mm – 15 mm
Silicone disc Pink RA70HTTin and zamakAvailable in Ø 230 mm – 300 mm and 400 mm
and thicknesses of 5 mm – 10 mm – 15 mm
Silicone disc Yellow G55TinAvailable in Ø 230 mm – 300 mm and 400 mm
and thicknesses of 5 mm – 10 mm – 15 mm
Silicone disc White SB55
(with additive)
Polyester resinAvailable in Ø 230 mm – 300 mm and 400 mm
and thicknesses of 5 mm – 10 mm – 15 mm
Silicone disc Green SB50HTTin, zamak and polyester resinAvailable in Ø 230 mm – 300 mm and 400 mm
and thicknesses of 5 mm – 10 mm – 15 mm
Transparent silicone HT33 A with HT33 BTin and polyester resinUsed for very small production quantities
Silicone block A32Tin and polyester resinAvailable in 2 kg blocks
Silicone disc Green SB 50 / 99TinAvailable in Ø 230 mm – 300 mm
and thicknesses of 5 mm – 10 mm
Silicone disc Antique roseTin and resin for lost wax castingPlate of 300 x 300 x 6.35 mm

Silicones with a diameter of 400 mm or more are generally ordered specifically by the client.

Implementation

The product safety information sheet below is available upon request from the METACONCEPT Group.

The implementation process is specific to the chosen medium (metal or polyester resin) and the characteristics of the part being produced. The METACONCEPT Group’s technical department will advise you on which silicone to choose and the appropriate implementation procedure.

 

Precautions of use

To prevent burns caused by the molten metal, it is advisable to wear a protective apron, shoes, gloves, helmet and glasses.
– Do not smoke at the workstation.
– The workstation must be well ventilated.
– Wash your hands when leaving the workstation.
COMMENTS :
Always use a flux suited to the intended use.
Contact our technical department to ascertain which product is most suited to your application.All of the information contained in this document is provided for informational purposes only and the METACONCEPT Group will not be held liable for it.