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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 silicone Shore A 33, translucent — visible casting with high tensile strength, available from Swiss stock.

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

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  • brand
  • Mixing ratio
  • Networking type
  • Paint has hardened
  • Self-leveling
  • Density (g/cm³)
  • Viscosity uncrosslinked (mPa·s)
  • Electrical insulation
  • Potting time (min)
  • Demolding time (min)
  • Full networking (h)
  • Food contact
  • Suitable for medical use
  • Certificates
  • Shore hardness A (cured)
  • Elongation at break (%)
  • Container

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Mold making SILISIL silicone RTV-2 Swiss bearing additive platinum prototyping Swiss brand 2K mold making Shore A 35

 
General Terms and Conditions.

Shipping usually within 1 to 3 business days
(availability will be confirmed after ordering)

. Express logistics. Fast and reliable within Switzerland & Europe.

Shipping from Swiss warehouse within 24 hours. Batch certificate. Invoice within 30 days (B2B). Technical support.
Shipping & Delivery

Usually 1 to 3 working days

Availability will be confirmed after order receipt.

Express logistics within Switzerland & Europe.

General 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 silicone (platinum crosslinking, RTV-2) of the MF-Mold & Form series — 2K addition silicone Shore A 33, translucent — for visible casting with high tear strength.

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

Key feature

Translucent molding compound — air bubbles become visible during mixing and pouring, but the embedded original remains recognizable upon 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 distinguishes SILISIL RTV MF-Dura 35

Translucent for visible pouring
Air inclusions, mold filling and the embedded original are visible during processing and demolding.
High tensile strength
High tear resistance — robust against mechanical stress during demolding.
High elongation at break 460%
High elasticity — safe demolding of complex geometries without damage to the mold or the original.
Low viscosity for detail reproduction
Low viscosity — precise detail reproduction down to the finest structures.
Shrinking arm
Shrinkage during addition crosslinking — shape is immediately dimensionally stable without waiting time.
Long mold lifespan
Long service life — economical for medium-sized production runs with hundreds of castings per mold.

What is SILISIL RTV MF-Dura 35 used for?

Jewelry and precious metal casting
Lost-wax casting process for goldsmiths, designers and manufacturers — 460% elongation at break protects the finest details during demolding.
Model and prototype construction
Detailed replicas of sculptures, design studies and architectural models — the translucency allows visual inspection of the form-filling.
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 collector's items.
Concrete and stone replicas
Resistant to cement formulations, ideal for sculpture replicas, paving stones and decorative building elements.
Visual inspection of the embedded originals
The position of the original remains recognizable during demolding — important for complex undercuts and multi-part shapes.

processing

1
Prepare the original
The surface to be reproduced must be clean, dry, and dust-free. The ideal processing temperature is 23°C — cooler environments significantly extend the pot life and curing time.
2
homogenize and mix components
Stir the base and catalyst thoroughly before use. Weigh out 1:1 by weight (tolerance ±5%). When mixing, thoroughly incorporate the mixture into the container walls and bottom.
3
Vacuum venting
For non-porous molds, briefly de-aerate the mixture under vacuum — trapped air bubbles are removed and a smooth mold surface is guaranteed.
4
Pour slowly into the mold
Pour in a thin stream from a height of approximately 30 cm into the lowest point — the silicone displaces air on its own and reaches all undercuts.
5
Vulcanizing and demolding
At 23 °C, demolding is possible after approximately 210 minutes; complete curing takes 24 hours. A 24-hour "maturation phase" is required before the first casting to ensure maximum strength.
Data sheets & safety data sheet
Full TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

Important instructions

Avoid crosslinking inhibitors
Additive systems like MF-Dura 35 are sensitive to sulfur, amine, tin, and phosphorus compounds—especially latex gloves, modeling clay, adhesive tapes, and some paints. If in doubt, make a small test cast before use.
Storage and shelf life
In its unopened original container, the product has a shelf life of at least 12 months when stored in a dry, cool place (10–25 °C). Consult the Safety Data Sheet (SDS) before opening.
Available packaging
1 kg + 1 kg, 5 kg + 5 kg, 25 kg + 25 kg. Other package sizes available on request.
compatibility
Compatible with polyurethane, epoxy, and polyester casting resins. Apply a release agent to protect the mold when using aggressive resins.

Recommended accessories

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

Which MF silicone for which application?

SILISIL RTV MF-Dura 35 in direct comparison with related MF products in 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?reddish-brownBlue
Pot life @23 °C20?1050
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Mold making SILISIL silicone RTV-2 Swiss bearing additive platinum prototyping Swiss brand 2K 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
Networking type Addition (Platinum)
Container 500g+500g, 1kg+1kg, 2.5kg+2.5kg, 5kg+5kg, 10kg+10kg, 25kg+25kg
Physical properties
Paint has hardened Translucent
Self-leveling Yes
Density (g/cm³) 1.09
Viscosity uncrosslinked (mPa·s) 7500
Electrical properties
Electrical insulation Yes
Curing values
Potting time (min) 20
Demolding time (min) 210
Full networking (h) 24
Product approvals
Food contact No
Suitable for medical use No
Certificates RoHS, REACH
Mechanical properties
Shore hardness A (cured) A 35
Elongation at break (%) 460

For binding values, please refer to the technical data sheet (TDS) in the "Documents" tab.

Documents and datasheets

Click on a document for a preview or the download icon for a 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 - Fiche Technique FR.pdf
125 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 two-component (Shore A 33, translucent) addition silicone for mold making and related applications. Two-component addition silicone, Shore A 33, translucent — visible casting with high tensile strength

At 23 °C, the pot life is approximately 20 minutes and the demolding time approximately 210 minutes. Complete curing is achieved after 24 hours. Lower temperatures extend, higher temperatures shorten these times.

As an addition system, SILISIL RTV MF-Dura 35 is sensitive to crosslinking inhibitors: sulfur, amine, tin, and phosphorus compounds can locally halt vulcanization. Avoid latex gloves, sulfur-containing modeling clays, some adhesive tapes, and PVC plasticizers in the immediate vicinity of the mold. If 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 maximum tolerance of ±5%. Homogenize both components separately before mixing, then thoroughly incorporate them – including the container walls and bottom. Brief vacuum degassing of the mixture is recommended for non-porous molds.

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

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Product specifications

Product information
Container 500g + 500g or 1kg + 1kg or 2.5kg + 2.5kg or 5kg + 5kg or 10kg + 10kg or 25kg + 25kg
brand SILISIL
Mixing ratio 1:1
Networking type Addition (Platinum)
Physical properties
Paint has hardened Translucent
Self-leveling Yes
Density (g/cm³) 1.09
Viscosity uncrosslinked (mPa·s) 7500
Electrical properties
Electrical insulation Yes
Curing values
Potting time (min) 20
Demolding time (min) 210
Full networking (h) 24
Product approvals
Certificates RoHS or REACH
Food contact No
Suitable for medical use No
Mechanical properties
Shore hardness A (cured) A 35
Elongation at break (%) 460
Keywords
Keywords
Mold making SILISIL silicone RTV-2 Swiss bearing additive platinum prototyping Swiss brand 2K mold making Shore A 35

Documents and datasheets

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