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SILISIL RTV MF-Ultra 50P

SILISIL RTV MF-Ultra 50P

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SILISIL RTV MF-Ultra 50P — 2K Kneadable Putty Shore A 50 — precise detail molding in 10 minutes, from Swiss stock.

2K addition silicone Shore A 50 (light blue, mixing ratio 1:1) — precise detail molding in 10 minutes.

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  • brand
  • Mixing ratio
  • Networking type
  • Paint has hardened
  • Self-leveling
  • Density (g/cm³)
  • Electrical insulation
  • Potting time (min)
  • Demolding time (min)
  • Food contact
  • Suitable for medical use
  • Certificates
  • Shore hardness A (cured)
  • 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
SILISIL RTV MF-Ultra 50P
SILISIL RTV MF-Ultra 50P
SILISIL ·

SILISIL RTV MF-Ultra 50P is a room temperature vulcanizing 2-component addition silicone (platinum cross-linking, RTV-2) from the MF-Mold & Form series — 2K Kneadable Putty Shore A 50 — precise detail molding in 10 minutes.

The mixture is prepared in a 1:1 ratio by weight (tolerance ±5%). Pot life at 23 °C is approximately 2–3 minutes, demolding is possible after approximately 10 minutes, and complete curing takes 24 hours. Temperature resistant from -40 °C to +200 °C.

Key feature

Kneadable silicone (putty) with a final hardness Shore A 50 — knead the base and catalyst between your hands, press directly onto the model, the mold is ready in 10 minutes.

SILISIL RTV MF-Ultra 50P in figures
A 50
Shore hardness
modeling clay
consistency
2–3 min
Pot life @23 °C
(see TDS) %
Elongation at break

What makes SILISIL RTV MF-Ultra 50P stand out

Kneadable putty — no container needed
Direct hand processing without container, mixer or vacuum chamber — the fastest way to the shape.
Potting time 2-3 minutes
Reproducible processing time — precise planning of mold production is possible.
Demolding after 10 minutes
Demolding time clearly defined — production-plannable with reproducible results.
Final hardness Shore A 50
Solid industrial final hardness — economical for medium-sized production runs with consistent shape accuracy.
Mixing ratio 1:1
Simple 1:1 ratio — mixable by hand without precision scales, ideal for workshops and hobbyists.
Hand-processed
Direct hand processing — no mixing machine, no vacuum, no special tools required.

What is SILISIL RTV MF-Ultra 50P used for?

Instant putty molds for high-strength replicas
Kneadable putty with a final hardness of Shore A 50 — dimensionally stable enough for multiple castings with aggressive resins.
Model repair and correction
Fill damaged areas on valuable tools or master models directly with putty; it will harden in 10 minutes.
Industrial detail replicas
Direct printing onto tool parts, coins, reliefs and microstructures — microscopic detail reproduction without vacuum.
Tool and fixture correction
Top choice for on-site toolmaking repairs — no disassembly, no preforming, no waiting time.
Jewelry workshop with meticulous attention to detail
Goldsmiths create original designs directly from the workpiece — no disassembly of set stones or connections is necessary.
Research, teaching and maker spaces
Simplest 1:1 hand processing with high final hardness — perfect for educational institutions and workshop training.

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 10 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-Ultra 50P 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. 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-Ultra 50P in direct comparison with related MF products in our range (MF = Mold & Form).

MF-Ultra 50P
Current product 		MF-PuttyFast 38 →MF-Ultra 50 →MF-Dura 35 Fast →
Shore hardness A50385035
Mixed viscosity(Putty / kneadable)(Play-Doh)5'0007'500
ColorLight blueLight purpleOrangeGreen
Pot life @23 °C2–33151
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 50P

All 14 product information sheets: 4 Physical properties , 3 Electrical properties, 1 Curing values, 2 Product approvals 3 Mechanical properties ,
Product information
brand SILISIL
Mixing ratio 1:1
Networking type Addition (Platinum)
Container 1kg + 1kg, 5kg + 5kg, 25kg + 25kg
Physical properties
Paint has hardened Light blue
Self-leveling Yes
Density (g/cm³) 1.32
Electrical properties
Electrical insulation Yes
Curing values
Potting time (min) 2
Demolding time (min) 10
Product approvals
Food contact No
Suitable for medical use No
Certificates RoHS, REACH
Mechanical properties
Shore hardness A (cured) A 50

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-Ultra 50P - Technical Data Sheet DE.pdf
123 KB
SILISIL RTV MF-Ultra 50P - Technical Data Sheet EN.pdf
123 KB
SILISIL RTV MF-Ultra 50P - Fiche Technique FR.pdf
123 KB

Frequently asked questions about SILISIL RTV MF-Ultra 50P

Practical application and design questions — answered by SILITECH.

SILISIL RTV MF-Ultra 50P is a 2-component (Shore A 50, light blue) instant putty mold for high-strength replicas and related applications. 2-component kneadable putty Shore A 50 — precise detail molding in 10 minutes

At 23 °C, the pot life is approximately 2–3 minutes and the demolding time approximately 10 minutes. Complete curing is achieved after 24 hours. Lower temperatures extend, higher temperatures shorten these times.

As an addition system, SILISIL RTV MF-Ultra 50P 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 50P 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 50P achieves a Shore A hardness of 50 (ASTM D 2240), a tensile strength of (see TDS) N/mm² (ASTM D 412), an elongation at break of approx. (see TDS) % and a tensile strength of 6 N/mm (ASTM D 624).

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Product specifications

Product information
Container 1kg + 1kg or 5kg + 5kg or 25kg + 25kg
brand SILISIL
Mixing ratio 1:1
Networking type Addition (Platinum)
Physical properties
Paint has hardened Light blue
Self-leveling Yes
Density (g/cm³) 1.32
Electrical properties
Electrical insulation Yes
Curing values
Potting time (min) 2
Demolding time (min) 10
Product approvals
Certificates RoHS or REACH
Food contact No
Suitable for medical use No
Mechanical properties
Shore hardness A (cured) A 50
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: