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SILISIL RTV MF-Dura 35

SILISIL RTV MF-Dura 35

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SILISIL RTV MF-Dura 35 — 2K addition-curing silicone Shore A 33, translucent — visible casting with high tear strength, from Swiss stock.

2K addition-curing silicone Shore A 33 (translucent, mixing ratio 1:1) — visible casting with high tear strength.

Price on request

  • Brand
  • Mixing Ratio
  • Curing type
  • Cured Color
  • Self-leveling
  • Density (g/cm³)
  • Uncrosslinked viscosity (mPa·s)
  • Electrical Insulation
  • Pot life (min)
  • Demolding time (min)
  • Full cure (h)
  • Food contact
  • Medical grade
  • Certificates
  • Shore hardness A (cured)
  • Elongation at break (%)
  • Container

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Mold Making SILISIL Silicone RTV-2 Swiss Stock Addition Platinum Prototyping Swiss Brand 2K Moulding / Mold Making Shore A 35

 
General Terms and Conditions

Shipping usually within 1 to 3 business days
(Availability confirmed after order)

Express logistics. Fast and reliable within Switzerland & Europe

From Swiss stock Dispatch within 24h Batch certificate Invoice 30 days (B2B) Technical advice
Shipping & Delivery

Usually 1 to 3 business days

Availability is confirmed after order receipt.

Express logistics within Switzerland & Europe.

Terms and Conditions →

Product data

HS Code: 3910.0000

HS Code: 3910.0000

SILISIL RTV MF-Dura 35
SILISIL RTV MF-Dura 35
SILISIL ·

SILISIL RTV MF-Dura 35 is a room-temperature vulcanizing 2-component addition-cure silicone (platinum-catalyzed, RTV-2) from the MF-Mold & Form series — 2K addition-cure silicone Shore A 33, translucent — visible casting with high tear strength.

The mixture is prepared in a ratio of 1:1 by weight (tolerance ±5%). Pot life at 23 °C approx. 20 minutes, demolding after approx. 210 minutes, complete curing after 24 hours. Temperature resistant from –40 °C to +200 °C.

Key property

Translucent molding compound — air bubbles become visible during mixing and pouring, the embedded original remains recognizable during demolding. Mixing ratio 1:1 by weight, low shrinkage.

SILISIL RTV MF-Dura 35 in figures
A 33
Shore Hardness
7'500
mPa·s viscosity
20 min
Pot life @23 °C
460 %
Elongation at break

What sets SILISIL RTV MF-Dura 35 apart

Translucent for visible pouring
Air inclusions, mold filling, and the embedded original are visible during processing and demolding.
High tear strength
High tear strength — robust against mechanical stress during demolding.
High elongation at break 460%
High elasticity — reliable demolding of complex geometries without damaging the mold or the original.
Low viscosity for detailed reproduction
Low viscosity — precise detail reproduction down to the finest structures.
Low Shrinkage
Low shrinkage upon addition curing — the mold is immediately dimensionally stable without waiting time.
Long mold service life
Long pot life — economical for medium series with hundreds of casts per mold.

What is SILISIL RTV MF-Dura 35 used for?

Jewelry and precious metal molding
Lost-wax casting process for goldsmiths, designers, and manufacturers — elongation at break of 460% protects finest details during demolding.
Model and prototype construction
High-fidelity replicas of sculptures, design studies, and architectural models — the translucency allows visual inspection of mold filling.
Casting resin molds with visual inspection
Compatible with polyurethane, epoxy, and polyester resins — visible mold wall for assessing air inclusions.
Toy and collector replicas
Tear-resistant mold (>5 N/mm²) for small-series reproductions of action figures, model building parts, and collectibles.
Concrete and cast stone replicas
Resistant to cement formulations, ideal for sculpture replicas, paving stones, and decorative building elements.
Visual inspection of embedded originals
When demolding, the position of the original remains recognizable — important for complex undercuts and multi-part molds.

Processing

1
Prepare the original
The surface to be reproduced must be clean, dry, and free of dust. The ideal processing temperature is 23 °C — cooler environments significantly extend pot life and curing time.
2
Homogenize and mix components
Stir base and catalyst thoroughly before use. Weigh out 1:1 by weight (tolerance ±5%). When mixing, thoroughly incorporate the walls and bottom of the container.
3
Vacuum degassing
For pore-free molds, briefly degas the mixture under vacuum — entrapped air bubbles are removed, ensuring a smooth mold surface.
4
Pour slowly into the mold
Pour from a height of approx. 30 cm in a thin stream into the deepest point — the silicone displaces air independently and reaches all undercuts.
5
Vulcanize and demold
At 23 °C, demolding is possible after approx. 210 minutes, with complete curing after 24 hours. Before the first pour, allow a 24-hour "maturation phase" for maximum strength.
Data Sheets & Safety Data Sheet
Complete TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

Important Notes

Avoid crosslinking inhibitors
Addition-curing systems such as MF-Dura 35 are sensitive to sulfur, amine, tin, and phosphorus compounds — especially latex gloves, kneading compounds, adhesive tapes, and certain varnishes. When in doubt, perform a small test pour before use.
Storage and Shelf Life
Shelf life of at least 12 months in unopened original container when stored in a dry, cool place (10–25 °C). Consult the Safety Data Sheet (SDS) before opening.
Available containers
1 kg + 1 kg, 5 kg + 5 kg, 25 kg + 25 kg. Other container sizes available on request.
Compatibility
Compatible with polyurethane, epoxy, and polyester casting resins. For aggressive resins, apply a release agent to protect the mold.

Recommended accessories

SILISIL white petroleum jelly release paste
Universal release agent for polyester, epoxy, and polyurethane casts — protects the silicone mold from aggressive resins and extends mold service life.
To the product →
SILISIL Delayer PA
Retarder for addition-curing silicones — extends pot life and setting time for more complex multi-part builds and relaxed processing.
To the product →
SILISIL Silicone Remover
Cleaning agent for silicone residues on tools, models, and work surfaces — gentle and effective.
To the product →

Which MF silicone for which application?

SILISIL RTV MF-Dura 35 in direct comparison with related MF products from our range (MF = Mold & Form).

MF-Dura 35
Current Product 		MF-Dura 30 →MF-Dura 32 →MF-Dura 40 →
Shore hardness A33?3240
Mixed viscosity7'500?6'0005'500
ColorTranslucent?Brown RedBlue
Pot life @23 °C20?1050
Topics & Application Fields
Key terms related to this product. Also useful for our search and filters.
Mold Making SILISIL Silicone RTV-2 Swiss Stock Addition Platinum Prototyping Swiss Brand 2K Moulding / Mold Making Shore A 35

Technical Data for SILISIL RTV MF-Dura 35

All 17 Product Information 4 Physical Properties 4 Electrical Properties 1 Curing Values 3 Product Approvals 3 Mechanical Properties 2
Product Information
Brand SILISIL
Mixing Ratio 1:1
Curing type Addition (Platinum)
Container 500 g + 500 g, 1 kg + 1 kg, 2.5 kg + 2.5 kg, 5 kg + 5 kg, 10 kg + 10 kg, 25 kg + 25 kg
Physical Properties
Cured Color Translucent
Self-leveling Yes
Density (g/cm³) 1.09
Uncrosslinked viscosity (mPa·s) 7500
Electrical Properties
Electrical Insulation Yes
Curing values
Pot life (min) 20
Demolding time (min) 210
Full cure (h) 24
Product Approvals
Food contact No
Medical grade No
Certificates RoHS, REACH
Mechanical properties
Shore hardness A (cured) A 35
Elongation at break (%) 460

Please refer to the technical data sheet (TDS) in the "Documents" tab for binding values.

Documents and data sheets

Click on a document for the preview or the download icon for direct download.

Technical Data Sheets (TDS) 3
SILISIL RTV MF-Dura 35 - Technical Data Sheet DE.pdf
125 KB
SILISIL RTV MF-Dura 35 - Technical Data Sheet EN.pdf
125 KB
SILISIL RTV MF-Dura 35 - Technical Data Sheet FR.pdf
125 KB
Safety Data Sheets (SDS) 3
SILISIL RTV MF-Dura 35 - Sicherheitsdatenblatt DE.pdf
357 KB
SILISIL RTV MF-Dura 35 - Safety Data Sheet EN.pdf
378 KB
SILISIL RTV MF-Dura 35 - Safety Data Sheet FR.pdf
383 KB

Frequently Asked Questions about SILISIL RTV MF-Dura 35

Practical application and design questions — answered by SILITECH.

SILISIL RTV MF-Dura 35 is a 2K addition-cure silicone (Shore A 33, translucent) for mold making and related applications. 2K addition-cure silicone Shore A 33, translucent — visible casting with high tear strength

At 23 °C, the pot life is approx. 20 minutes and the demolding time approx. 210 minutes. Full curing is achieved after 24 hours. Lower temperatures extend these values, higher temperatures shorten them.

As an addition-curing system, SILISIL RTV MF-Dura 35 is sensitive to crosslinking inhibitors: sulfur, amine, tin, and phosphorus compounds can locally stop vulcanization. Avoid latex gloves, sulfur-containing modeling compounds, some adhesive tapes, and PVC plasticizers in the immediate vicinity of the mold. When in doubt, make a small test cast.

SILISIL RTV MF-Dura 35 is mixed in a 1:1 ratio by weight (base to catalyst), with a tolerance of maximum ±5%. Homogenize both components separately before mixing, then incorporate thoroughly — including container walls and bottom. A brief vacuum degassing of the mixture is recommended for pore-free molds.

SILISIL RTV MF-Dura 35 achieves a Shore A hardness of 33 (ASTM D 2240), a tear strength of >5 N/mm² (ASTM D 412), an elongation at break of approx. 460%, and a tear resistance of 20 N/mm (ASTM D 624).

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Product Specifications

Product Information
Container 500 g + 500 g or 1 kg + 1 kg or 2.5 kg + 2.5 kg or 5 kg + 5 kg or 10 kg + 10 kg or 25 kg + 25 kg
Brand SILISIL
Mixing Ratio 1:1
Curing type Addition (Platinum)
Physical Properties
Cured Color Translucent
Self-leveling Yes
Density (g/cm³) 1.09
Uncrosslinked viscosity (mPa·s) 7500
Electrical Properties
Electrical Insulation Yes
Curing values
Pot life (min) 20
Demolding time (min) 210
Full cure (h) 24
Product Approvals
Certificates RoHS or REACH
Food contact No
Medical grade No
Mechanical properties
Shore hardness A (cured) A 35
Elongation at break (%) 460
Keywords
Keywords
Mold Making SILISIL Silicone RTV-2 Swiss Stock Addition Platinum Prototyping Swiss Brand 2K Moulding / Mold Making Shore A 35

Documents and data sheets

Safety Data Sheets (SDS) and Technical Data Sheets (TDS) for download: