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SILISIL RTV MF-Ultra 50

SILISIL RTV MF-Ultra 50

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SILISIL RTV MF-Ultra 50 — 2K high-strength silicone Shore A 50, orange — precise reproduction with long service life, available from Swiss stock.

2K addition silicone Shore A 50 (orange, mixing ratio 1:1) — precise reproduction with long service life.

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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 addition platinum prototyping Shore A 50 Swiss brand 2K mold making

 
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-Ultra 50
SILISIL RTV MF-Ultra 50
SILISIL ·

SILISIL RTV MF-Ultra 50 is a room temperature vulcanizing 2-component addition silicone (platinum crosslinking, RTV-2) of the MF-Mold & Form series — 2K high-strength silicone Shore A 50, orange — precise reproduction with long service life.

The mixture is prepared in a 1:1 ratio by weight (tolerance ±5%). Pot life at 23°C is approximately 15 minutes, demolding is possible after approximately 3 hours, and complete curing takes 24 hours. Temperature resistant from -40°C to +200°C.

Key feature

Low viscosity at Shore A 50 — flows precisely into the finest structures despite high final hardness, ideal for highly stressed tool shapes.

SILISIL RTV MF-Ultra 50 in figures
A 50
Shore hardness
5'000
mPa·s viscosity
15 min
Pot life @23 °C
150 %
Elongation at break

What makes SILISIL RTV MF-Ultra 50 stand out

Final hardness Shore A 50
Solid industrial final hardness — economical for medium-sized production runs with consistent shape accuracy.
Low viscosity 5,000 mPa·s
Low mixing viscosity — flows into the finest structures without air inclusions, vacuum venting optional.
Very good long-term stability
Stable over long storage and usage periods — the shape ages in a controlled manner without wear values.
Precise reproduction
High level of detail reproduction — fonts, structures and sharp edges are reproduced true to life.
Mixing ratio 1:1 by weight
Simple 1:1 ratio — mixable by hand without precision scales, ideal for workshops and hobbyists.
Striking orange mixed color
Striking orange mixed color — easy visual differentiation in everyday workshop life.

What is SILISIL RTV MF-Ultra 50 used for?

Industrial high-performance tool molds
Shore A 50 with low viscosity (5,000 mPa·s) for tool molds that require detail AND mechanical strength.
Master model reproduction in series
Excellent long-term stability of mechanical properties — the shape retains its dimensional accuracy over hundreds of cycles.
Resin and synthetic resin casting in series
Resistant to polyurethane, epoxy and polyester casts — economical mold for small and medium production runs.
High-volume jewelry wax molds
Higher final hardness = more wax castings per mold — an economical choice for goldsmiths with series production.
Concrete and stone industrial molds
Robust for abrasive concrete mixtures — paving stones, stone facades, architectural elements in series production.
Detailed reproduction with long mold lifespan
Excellent long-term stability at Shore A 50 — the shape retains dimensional accuracy and detail sharpness over hundreds of cycles.

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 3 hours, with complete curing after 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-Ultra 50 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. Other container 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-Ultra 50 in direct comparison with related MF products in our range (MF = Mold & Form).

MF-Ultra 50
Current product 		MF-Ultra 45 →MF-Ultra 50P →MF-Ultra 60 →
Shore hardness A50455060
Mixed viscosity5'0008'000(Putty / kneadable)230'000
ColorOrangeTranslucentLight blueBlue
Pot life @23 °C1510–122–360
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Mold making SILISIL silicone RTV-2 Swiss bearing addition platinum prototyping Shore A 50 Swiss brand 2K mold making

Technical data for SILISIL RTV MF-Ultra 50

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 1kg + 1kg, 5kg + 5kg, 10kg + 10kg, 25kg + 25kg
Physical properties
Paint has hardened Orange
Self-leveling Yes
Density (g/cm³) 1.1
Viscosity uncrosslinked (mPa·s) 20'000
Electrical properties
Electrical insulation Yes
Curing values
Potting time (min) 15
Demolding time (min) 180
Full networking (h) 24
Product approvals
Food contact No
Suitable for medical use No
Certificates RoHS, REACH
Mechanical properties
Shore hardness A (cured) A 50
Elongation at break (%) 320

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) 6
SILISIL RTV MF-Ultra 50 - Technical Data Sheet DE.pdf
150 KB
SILISIL RTV MF-Ultra 50 - Technical Data Sheet DE.pdf
126 KB
SILISIL RTV MF-Ultra 50 - Technical Data Sheet EN.pdf
153 KB
SILISIL RTV MF-Ultra 50 - Technical Data Sheet EN.pdf
125 KB
SILISIL RTV MF-Ultra 50 - Fiche Technique FR.pdf
126 KB
SILISIL RTV MF-Ultra 50 - Fiche Technique FR.pdf
156 KB
Safety Data Sheets (SDS) 3
SILISIL RTV MF-Ultra 50 - Safety Data Sheet DE.pdf
359 KB
SILISIL RTV MF-Ultra 50 - Safety Data Sheet EN.pdf
389 KB
SILISIL RTV MF-Ultra 50 - Fiche de Sécurité FR.pdf
395 KB

Frequently asked questions about SILISIL RTV MF-Ultra 50

Practical application and design questions — answered by SILITECH.

SILISIL RTV MF-Ultra 50 is a two-component (Shore A 50, orange) additive silicone for high-performance industrial tooling and related applications. Two-component high-strength silicone, Shore A 50, orange – precise reproduction with a long service life

At 23 °C, the pot life is approximately 15 minutes and the demolding time approximately 3 hours. Complete curing is achieved after 24 hours. Lower temperatures extend, higher temperatures shorten these times.

As an addition system, SILISIL RTV MF-Ultra 50 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-Ultra 50 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-Ultra 50 achieves a Shore A hardness of 50 (ASTM D 2240), a tensile strength of 3.6 N/mm² (ASTM D 412), an elongation at break of approximately 150% and a tensile strength of 5 N/mm (ASTM D 624).

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Product specifications

Product information
Container 1kg + 1kg or 5kg + 5kg or 10kg + 10kg or 25kg + 25kg
brand SILISIL
Mixing ratio 1:1
Networking type Addition (Platinum)
Physical properties
Paint has hardened Orange
Self-leveling Yes
Density (g/cm³) 1.1
Viscosity uncrosslinked (mPa·s) 20'000
Electrical properties
Electrical insulation Yes
Curing values
Potting time (min) 15
Demolding time (min) 180
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 50
Elongation at break (%) 320
Keywords
Keywords
Mold making SILISIL silicone RTV-2 Swiss bearing addition platinum prototyping Shore A 50 Swiss brand 2K mold making

Documents and datasheets

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