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SILBIONE RTV 4320

SILBIONE RTV 4320

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2K-Pt silicone paste for orthopedic insoles and heel spur pads — mixing ratio 1:1.

2K-Pt silicone paste (Shore A 20) for orthopedic insoles and heel spur pads — food and medical grade tested

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  • Manufacturer
  • Networking type
  • Container
  • Number of components
  • consistency
  • Mixing ratio
  • UV resistance
  • Paint has hardened
  • Self-leveling
  • Electrical insulation
  • Potting time (min)
  • Demolding time (min)
  • Food contact
  • Suitable for medical use
  • Elongation at break (%)
  • Tensile strength (N/mm)

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Silicone USP CLASS VI 2K silicone SILBIONE ELKEM Swiss bearing biocompatible FDA RTV Addition Platinum Paste Silicone 1:1 Medical-Grade ISO 10993 sterilizable RTV 4320 orthopedic insole Footcare Heel Spur Shore A 20 Orthopedics Chair-Side fast curing 4 min

 
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

Internal reference: 40-4320

HS code: 3910.0000

Internal reference: 40-4320
HS code: 3910.0000

SILBIONE RTV 4320
SILBIONE RTV 4320
Silbione Elkem Silicones SKU 40-4320​

Silbione RTV 4320 A & B is a 2K-Pt silicone paste (Shore A 20) for orthopedic insoles and heel spur pads — tested to be food and medical compliant.

This product line comprises medically approved 2K polyaddition silicone pastes for orthopedic workshops — insoles, pads, pressure relief — biocompatible and tested. Silbione 4320 is tailored to specific industrial applications — the most important properties and areas of application are listed below.

Orthopedic insole specialist

Silbione RTV 4320 is specifically designed for the production of orthotic insoles and heel spur pads. Its paste consistency allows for direct adaptation to the foot, low linear shrinkage, and an excellent balance between hardness and tensile strength. Medically approved.

Silbione 4320 in figures
Shore A 20
hardness
Medical license
biocompatible
200 %
Elongation at break
7 kN/m
Tear resistance

What makes Silbione 4320 stand out

Medical approval
Meets regulatory requirements in several countries for medical and pharmaceutical applications.
Paste consistency
Can be applied directly to the foot — custom-made possible.
Low shrinkage
Accurate reproduction without delay.
Balance of hardness/tear strength
Optimal wearing comfort + long-term durability.
Good form separation
Excellent mold release properties.
1:1 mixing ratio
Simple manual processing.

What is Silbione 4320 used for?

Orthopedic insoles
Main application — Custom manufacturing of orthopedic insoles.
Heel spur pads
Special insoles for heel spur patients.
Pressure relief insoles
Diabetic and pressure relief applications.
Sports insoles
Custom-made sports and running insoles.
Shoe insole workshop
Practical and workshop applications.
Anti-slip pads
Protective and comfort pads in shoes.
Data sheets & safety data sheet
Full TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

processing

1
Prepare patient foot / model
Clean and dry — paste consistency allows direct adaptation to the foot.
2
Mix 1:1
Knead the components together by hand until they are a uniform color. Use vinyl gloves (no latex — it inhibits Pt-Cure).
3
Apply to model
Apply or press into shape within the processing time (2 min).
4
Curing
4 minutes at room temperature — very fast networking.
5
Adjust + Polish
After crosslinking, adjust the insert, break the edges, and polish if necessary.

Recommended accessories

Bluesil Primer 131
Universal adhesion promoter for stainless steel, aluminum, PMMA and many metals.
View product →

Important instructions

Mixing & Dosage
Stir A and B thoroughly before each use. Use precise dosage in the specified ratio (see table above) — ideally by weight. Incorrect dosage will result in incomplete cross-linking.
Degassing
Degas the mixture under a vacuum of 30–50 mbar. The material expands 3–4 times, then contracts back to its original size after 5–10 minutes. Interrupt the vacuum several times for better degassing.
Avoid inhibitors
Polyaddition silicones are inhibited by: sulfur-vulcanized rubber, tin-catalyzed RTV, amine epoxides, and PVC with tin salts. If in doubt, conduct a preliminary test.
Application advice
SILITECH will advise you on the optimal RTV variant for your application — substrate, hardness, pot life, mechanics. Contact us with your specific application details.

Silbione 4320 compared to related RTV products

Networking system, mechanics, and processing times side by side — all values ​​from the official Elkem TDS. “— " = not specified in the datasheet.

Silbione 4320
Current product		 Silbione 4410 QC →Silbione 4411 →Silbione 4420 →
Networking system2K Polyaddition (Pt) Paste2K Polyaddition (Pt)2K Polyaddition (Pt)2K Polyaddition (Pt)
Mixing ratio1 : 11 : 11 : 11 : 1
ColorWhitish-brown (A) / white (B)Translucent (A) / skin-colored (B)TranslucentTranslucent
Shore A hardnessA 20A 11A 11A 20
Elongation at break200 %780 %1'000 %650 %
Tensile strength—3.6 MPa3.8 MPa5.0 MPa
Tear resistance7 kN/m14 N/mm12 N/mm15 N/mm
Potting time2 min10 min60 min50 min
demolding time4 min60 min @ 80 °C30 min @ 120 °C60 min @ 80 °C
Mixed viscositypaste1,500 mPa·s8,000 mPa·s4,000 mPa·s
Main applicationOrthopedic insolesLiners for leg prosthesesLeg prosthesis linerHighly stressed liners
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Silicone USP CLASS VI 2K silicone SILBIONE ELKEM Swiss bearing biocompatible FDA RTV Addition Platinum Paste Silicone 1:1 Medical-Grade ISO 10993 sterilizable RTV 4320 orthopedic insole Footcare Heel Spur Shore A 20 Orthopedics Chair-Side fast curing 4 min

Technical specifications for SILBIONE RTV 4320

All 17 product information 7 Further properties 1 Physical properties 2 Electrical properties 1 Curing values ​​2 Product approvals 2 Mechanical properties 2
Product information
brand Silbione
Manufacturer Elkem Silicones
Networking type Addition (Platinum)
Container 1kg + 1kg, 5kg + 5kg, 25kg + 25kg
Number of components 2K (two-component)
consistency Thixotropic
Mixing ratio 1:1
Other features
UV resistance No
Physical properties
Paint has hardened White
Self-leveling No
Electrical properties
Electrical insulation No
Curing values
Potting time (min) 2
Demolding time (min) 4
Product approvals
Food contact Yes
Suitable for medical use Yes
Mechanical properties
Elongation at break (%) 200
Tensile strength (N/mm) 7

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) 1
Silbione RTV 4320 A - Technical Data Sheet EN.pdf
629 KB
Safety Data Sheets (SDS) 3
Silbione RTV 4320 A - Safety Data Sheet DE.pdf
361 KB
Silbione RTV 4320 A - Fiche de Sécurité FR.pdf
565 KB
Silbione RTV 4320 A - Scheda di Sicurezza IT.pdf
557 KB

Frequently asked questions about Silbione 4320

Practical questions regarding processing and design — answered by SILITECH.

Silbione RTV 4320 A & B: 2K PT silicone paste (Shore A 20) for orthopedic insoles and heel spur pads — food-grade and medical-grade tested. Main applications include orthopedic insoles, heel spur pads, and pressure-relieving insoles.

Polyaddition crosslinking is a two-component silicone chemistry using a platinum catalyst. Component A contains the platinum complex, and component B contains the SiH crosslinker. When mixed, the components crosslink without releasing reaction byproducts—no shrinkage due to outgassing, excellent dimensional accuracy, and low linear shrinkage. Important: Polyaddition silicones are inhibited by various substances—sulfur-vulcanized natural rubbers, tin-catalyzed RTV silicones, amine-catalyzed epoxy resins, and tin-stabilized PVC. In case of doubt, a preliminary test should be carried out.

Thoroughly stir components A and B before each processing step. Measure precisely according to the mixing ratio specified in the TDS (see comparison table above) – ideally by weight. Mix with an electric or pneumatic agitator at low speed (minimize air entrainment). Degas the mixture under vacuum (30–50 mbar) – the material will expand 3–4 times its original volume, bubbles will escape, and the material will settle back after 5–10 minutes. Then slowly pour into the mold from the lowest point to avoid air entrapment. For polyaddition systems, avoid contact with inhibitors (sulfur-based rubber, tin-based RTV, amine epoxides, PVC with tin salts).

Store in the unopened original container in a dry, cool place — typically between +5 and +30 °C, see TDS for exact values. Store components A and B separately; seal airtight after opening. Polyaddition systems are insensitive to moisture, but should be stored in a cool place to maintain pot life. Consult the Safety Data Sheet (SDS) before use.

The comparison table above lists related RTV products with different hardnesses, pot lives, or application profiles. If you are unsure which product is best for you, we would be happy to advise you — contact SILITECH with details of your application (substrate, desired hardness, processing time, mechanical requirements, and durability).

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Product specifications

Product information
Container 1kg + 1kg or 5kg + 5kg or 25kg + 25kg
brand Silbione
Manufacturer Elkem Silicones
Networking type Addition (Platinum)
Number of components 2K (two-component)
consistency Thixotropic
Mixing ratio 1:1
Other features
UV resistance No
Physical properties
Paint has hardened White
Self-leveling No
Electrical properties
Electrical insulation No
Curing values
Potting time (min) 2
Demolding time (min) 4
Product approvals
Food contact Yes
Suitable for medical use Yes
Mechanical properties
Elongation at break (%) 200
Tensile strength (N/mm) 7
Keywords
Keywords
Silicone USP CLASS VI 2K silicone SILBIONE ELKEM Swiss bearing biocompatible FDA RTV Addition Platinum Paste Silicone 1:1 Medical-Grade ISO 10993 sterilizable RTV 4320 orthopedic insole Footcare Heel Spur Shore A 20 Orthopedics Chair-Side fast curing 4 min
Mechanical properties
Shore hardness A20.0 Shore A
Tensile strength2.0 MPa
Elongation at break200.0 %
Tear resistance7.0 kN/m
Linear shrinkage< 0.1 %
processing
Pot life at 23°C2.0 min
demolding time4.0 min
Physical & Thermal
Density (23°C)1.4 g/cm³
Temperature resistance (duration)-50 to 150 °C
Peak temperature (short-term)150 °C
storage
Shelf life in original packaging12 months
Storage temperature-10 to 30 °C

Documents and datasheets

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