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  1. All Products
  2. Silicone products
  3. RTV-2 Silicones
  4. SILISIL RTV MF-Ultra 50 Orange
  5. RTV-2 Silicones
Price list: Website 0 CHF Price list
Price list: Website 0 CHF Price list
SILISIL RTV MF-Ultra 50 Orange

SILISILRTV-2 silicones

SILISIL RTV MF-Ultra 50 Orange

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

Cured Color
Orange
Self-leveling
Yes
Density (g/cm³)
1.1
Uncrosslinked viscosity (mPa·s)
20'000

CHF 0.00 / pc.
  • Brand
  • Color hardened - Orange
  • Food contact
  • Shore hardness A (cured)
  • Self-leveling
  • Medical grade
  • Density (g/cm³)
  • Uncrosslinked viscosity (mPa·s)
  • Mixing Ratio
  • Pot life (min)
  • Demolding time (min)
  • Full cure (h)
  • Elongation at break (%)
  • Curing type
  • Electrical Insulation
  • Container
Your selection SILISIL RTV MF-Ultra 50 Orange
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Technical documentation

Technical data sheets

Safety data sheets

Further documents

HS Code: 3910.0000

SILISIL RTV MF-Ultra 50 Orange Pattern Offer

Technical Data

Typical values, not a specification. The technical data sheet (TDS) is binding.

Product Information

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

Physical Properties

Cured Color
Orange
Self-leveling
Yes
Density (g/cm³)
1.1
Uncrosslinked viscosity (mPa·s)
20'000

Electrical Properties

Electrical Insulation
Yes

Curing values

Pot life (min)
15
Demolding time (min)
180
Full cure (h)
24

Product Approvals

Food contact
No
Medical grade
No

Mechanical properties

Shore hardness A (cured)
A 50
Elongation at break (%)
320
Keywords
  • Mold Making
  • SILISIL
  • Silicone
  • RTV-2
  • Swiss warehouse
  • Addition
  • Platinum
  • Prototyping
  • Shore A 50
  • Swiss brand
  • 2K
  • Moulding / Toolmaking

Product Description

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 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
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 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 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 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. 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.
To the documents →

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.
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-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

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).