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  1. All Products
  2. Silicone products
  3. RTV-2 Silicones
  4. SILISIL RTV MF-Spray 25-6
  5. RTV-2 Silicones
Price list: Website 0 CHF Price list
Price list: Website 0 CHF Price list
SILISIL RTV MF-Spray 25-6

SILISILRTV-2 silicones

SILISIL RTV MF-Spray 25-6

2K addition silicone from the MF-Mold & Form series — Shore A 25, light blue mixed color, 6 min pot life, 1:1 mixing ratio by weight for vacuum forming and packaging applications

Cured Color
Light blue
Self-leveling
Yes
Density (g/cm³)
1.1
Uncrosslinked viscosity (mPa·s)
8000

CHF 0.00 / pc.
  • Brand
  • Color hardened - Light blue
  • 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)
  • Tensile strength (MPa)
  • Elongation at break (%)
  • Tear strength (N/mm)
  • Curing type
  • Electrical Insulation
  • Certificates
  • Container
Your selection SILISIL RTV MF-Spray 25-6
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Technical documentation

Technical data sheets

HS Code: 3910.0000

SILISIL RTV MF-Spray 25-6 Sample 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
25g+25g, 200ml+200ml, 1kg+1kg, 5kg+5kg, 10kg+10kg, 25kg+25kg

Physical Properties

Cured Color
Light blue
Self-leveling
Yes
Density (g/cm³)
1.1
Uncrosslinked viscosity (mPa·s)
8000

Electrical Properties

Electrical Insulation
Yes

Curing values

Pot life (min)
6
Demolding time (min)
30
Full cure (h)
24

Product Approvals

Food contact
No
Medical grade
No
Certificates
RoHS, REACH

Mechanical properties

Shore hardness A (cured)
A 25
Tensile strength (MPa)
4.5
Elongation at break (%)
420
Tear strength (N/mm)
26
Keywords
  • Mold Making
  • SILISIL
  • Silicone
  • RTV-2
  • Swiss warehouse
  • Addition
  • Platinum
  • Prototyping
  • Shore A 25
  • Swiss brand
  • 2K
  • Moulding / Toolmaking
  • Sprayable

Product Description

SILISIL RTV MF-Spray 25-6 is a room temperature vulcanizing 2-component addition silicone (platinum crosslinking, RTV-2) of the MF-Mold & Form series — 2K fast-curing silicone Shore A 25 with light blue mixed color and pot life 6 min for vacuum forming and packaging applications.

The mixture is prepared in a 1:1 ratio by weight (tolerance ±5%). Pot life at 23°C is approximately 6 minutes, demolding after approximately 30 minutes, and complete curing after 24 hours. Temperature resistant from -40°C to +200°C.

Key property

Short pot life (6 min) with excellent tensile strength of 26 N/mm — pourable into molds, ideal for vacuum forming tools and rapid multi-layer build-ups. For sprayable silicone: MF-SprayThixo 25-10.

SILISIL RTV MF-Spray 25-6 in figures
A 25
Shore Hardness
8'000
mPa·s viscosity
6 min
Pot life @23 °C
420 %
Elongation at break

What makes SILISIL RTV MF-Spray 25-6 stand out

Pot life only 6 minutes
Very short processing time — suitable for high-throughput production with short mold cycles.
Very high tensile strength 26 N/mm
Very high tear resistance — the mold withstands hundreds of cycles with abrasive materials without wear.
Low viscosity 8,000 mPa·s
Low mixed viscosity — flows into finest structures without air entrapment, vacuum degassing optional.
Light blue mixed color for layer control
Light blue mixing control — clean layer transitions and completeness of mixing visually verifiable.
Elongation at break 420%
High elasticity — reliable demolding of complex geometries without damaging the mold or the original.
Mixing ratio 1:1 by weight
Simple 1:1 ratio — hand-mixable without a precision scale, ideal for workshops and hobbyists.

What is SILISIL RTV MF-Spray 25-6 used for?

Vacuum packaging and thermoforming molds
Tear-resistant (tear resistance 26 N/mm) for hundreds of vacuum cycles in packaging and film processing — pot life 6 min enables quick shape changes.
Multi-layered mold structures
Pot life only 6 minutes — layers can be built up quickly, ideal for thick support and shell shapes.
Undercut impressions
Elongation at break of 420% and very high tensile strength allow for the demolding of aggressive geometries without damage.
Fast reproduction with long mold lifespan
Peak tensile strength 26 N/mm — the mold withstands hundreds of castings without wear.
Modeling and design studios
Reproduction of sculptures, design studies and industrial samples with high detail and fast processing speed.
Light blue shift control
The striking mixed color makes layer transitions in multi-layer structures visually recognizable — clean processing documentation.

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 approximately 30 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
Complete TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

Important Notes

Avoid crosslinking inhibitors
Additive systems like MF-Spray 25-6 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-Spray 25-6 in direct comparison with related MF products in our range (MF = Mold & Form).

MF-Spray 25-6
Current Product 		MF-SprayThixo 25-10 →MF-PuttyFast 38 →MF-Soft 12 →
Shore hardness A25253812
Mixed viscosity8'000thixotropic(Play-Doh)3'500
ColorLight blueLight blueLight VioletBlue
Pot life @23 °C610320

Frequently asked questions about SILISIL RTV MF-Spray 25-6

Practical application and design questions — answered by SILITECH.

SILISIL RTV MF-Spray 25-6 is a two-component (Shore A 25, light blue) additive silicone for vacuum packaging, thermoforming, and related applications. This fast-curing, two-component silicone (Shore A 25) has a light blue color and a pot life of 6 minutes. It is suitable for vacuum forming and packaging applications

At 23 °C, the pot life is approximately 6 minutes and the demolding time approximately 30 minutes. Complete curing is achieved after 24 hours. Lower temperatures extend, higher temperatures shorten these times.

As an addition system, SILISIL RTV MF-Spray 25-6 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-Spray 25-6 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-Spray 25-6 achieves a Shore A hardness of 25 (ASTM D 2240), a tensile strength of 4.5 N/mm² (ASTM D 412), an elongation at break of approximately 420 % and a tensile strength of 26 N/mm (ASTM D 624).