SILISIL RTV MF-Ultra 50 Blue

SILISIL ·

SILISIL RTV MF-Ultra 50 Blue 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, blue — 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 18 minutes, demolding is possible after approximately 4 hours, and complete curing takes 24 hours. Temperature resistant from -40°C to +200°C.

Key property

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

18'000

mPa·s viscosity

18 min

Pot life @23 °C

200 %

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 18,000 mPa·s

Low mixed viscosity — flows into finest structures without air entrapment, vacuum degassing 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 detail reproduction — fonts, structures, and sharp edges are reproduced true to nature.

Mixing ratio 1:1 by weight

Simple 1:1 ratio — hand-mixable without a precision scale, ideal for workshops and hobbyists.

Striking blue mixed color

Striking blue 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 (18,000 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

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.

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.

Vacuum degassing

For pore-free molds, briefly degas the mixture under vacuum — entrapped air bubbles are removed, ensuring a smooth mold surface.

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.

Vulcanize and demold

At 23 °C, demolding is possible after approx. 3 hours, complete curing after 24 hours. Before the first pour, allow a 24 h "maturation phase" for maximum strength.

Data Sheets & Safety Data Sheet

Complete TDS and SDS in DE, EN, FR — view or download directly.

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Important Notes

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

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. 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.

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SILISIL Delayer PA

Retarder for addition-curing silicones — extends pot life and setting time for more complex multi-part builds and relaxed processing.

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

	MF-Ultra 50 Blue Current Product	MF-Ultra 45 →	MF-Ultra 50P →	MF-Ultra 60 →
Shore hardness A	50	45	50	60
Mixed viscosity	18'000	8'000	(Putty / kneadable)	230'000
Color	Blue	Translucent	Light blue	Blue
Pot life @23 °C	15	10–12	2–3	60

Topics & Application Fields

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 Moulding / Mold making Price list missing

Technical data for SILISIL RTV MF-Ultra 50 Blue

All 16 product information 4 Physical properties 4 Electrical properties 1 Curing values 3 Product approvals 2 Mechanical properties 2

Product Information
Brand	SILISIL
Mixing Ratio	1:1
Curing type	Addition (Platinum)
Container	1kg + 1kg, 5kg + 5kg, 25kg + 25kg

Physical Properties
Cured Color	Blue
Self-leveling	Yes
Density (g/cm³)	1.2
Uncrosslinked viscosity (mPa·s)	18000

Electrical Properties
Electrical Insulation	Yes

Curing values
Pot life (min)	18
Demolding time (min)	240
Full cure (h)	24

Product Approvals
Food contact	No
Medical grade	No

Mechanical properties
Shore hardness A (cured)	A 50
Elongation at break (%)	200

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

No public documents available.
On request, we will gladly send you TDS and SDS by email, Submit request.

Frequently asked questions about SILISIL RTV MF-Ultra 50

Practical application and design questions — answered by SILITECH.

What is SILISIL RTV MF-Ultra 50 suitable for?

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

What is the pot life and demolding time of MF-Ultra 50?

At 23 °C, the pot life is approximately 18 minutes and the demolding time approximately 4 hours. Complete curing is achieved after 24 hours. Lower temperatures extend, higher temperatures shorten these times.

Which materials should be avoided when using MF-Ultra 50?

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.

What mixing ratio is used for MF-Ultra 50?

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.

What is the Shore hardness and mechanical properties of MF-Ultra 50?

SILISIL RTV MF-Ultra 50 achieves a Shore A hardness of 50 (ASTM D 2240), a tensile strength of 5.5N/mm² (ASTM D 412) and an elongation at break of approximately 200%.

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Product Specifications

Product Information
Container	1kg + 1kg or 5kg + 5kg or 25kg + 25kg
Brand	SILISIL
Mixing Ratio	1:1
Curing type	Addition (Platinum)

Physical Properties
Cured Color	Blue
Self-leveling	Yes
Density (g/cm³)	1.2
Uncrosslinked viscosity (mPa·s)	18000

Electrical Properties
Electrical Insulation	Yes

Curing values
Pot life (min)	18
Demolding time (min)	240
Full cure (h)	24

Product Approvals
Food contact	No
Medical grade	No

Mechanical properties
Shore hardness A (cured)	A 50
Elongation at break (%)	200

Keywords
Keywords	Mold making SILISIL silicone RTV-2 Swiss bearing addition platinum prototyping Shore A 50 Swiss brand 2K mold making

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SILISIL RTV MF-Ultra 50 Blue

Price on request

Documents

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Product data

What makes SILISIL RTV MF-Ultra 50 stand out

What is SILISIL RTV MF-Ultra 50 used for?

Processing

Important Notes

Recommended accessories

Which MF silicone for which application?

Technical data for SILISIL RTV MF-Ultra 50 Blue

Frequently asked questions about SILISIL RTV MF-Ultra 50

Your question not covered?

Product Specifications