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BLUESIL RTV 3330 SPU 25 kg

BLUESIL RTV 3330 SPU 25 kg

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BLUESIL® RTV 3330 SPU – Highly flexible 2K silicone rubber for PU-compatible molds with high abrasion resistance

2K-Sn-Silicone (Shore A 30, white) — the medium-hard variant of the RTV-3318/3330/3335-SPU family for PU casting resin series production

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  • Manufacturer
  • Networking type
  • Container
  • Number of components
  • consistency
  • Mixing ratio
  • UV resistance
  • Paint has hardened
  • Self-leveling
  • Density (g/cm³)
  • Viscosity uncrosslinked (mPa·s)
  • Electrical insulation
  • Potting time (min)
  • Demolding time (min)
  • Food contact
  • Suitable for medical use
  • Tensile strength (MPa)
  • Elongation at break (%)
  • Tensile strength (N/mm)

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Weiss Zinn Mold Making Silicone BLUESIL 2K Silicone ELKEM Swiss Warehouse RTV Base Component 25 kg Polyurethane Condensation SPU PU-resistant Series PU RTV 3330 Shore A 30 medium-hard Promotional Items Toy Mold

 
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Shipping from Swiss warehouse within 24 hours. Batch certificate. Invoice within 30 days (B2B). Technical support.
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Availability will be confirmed after order receipt.

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Product data

Internal reference: 40-3330SPU.KE.K025

HS code: 39100000

Internal reference: 40-3330SPU.KE.K025
HS code: 39100000

BLUESIL RTV 3330 SPU 25 kg
BLUESIL RTV 3330 SPU 25 kg
Bluesil · Elkem Silicones · SKU 40-3330SPU.KE.K025

Bluesil RTV 3330 SPU is a 2K sn silicone (Shore A 30, white) — the medium-hard variant of the RTV-3318/3330/3335-SPU family for PU casting resin series production.

This product line comprises 2K polycondensation silicone elastomers (Sn) specifically designed for serial production in polyurethane casting resin — offering maximum PU resistance, even against exothermically curing systems. RTV 3330 SPU is tailored to specific industrial applications — the most important properties and areas of application are listed below.

Medium-hard PU casting mold (Shore A 30)

Bluesil RTV 3330 SPU is the medium hardness level of the SPU series — Shore A 30 with higher shape stability than RTV 3318 SPU, same excellent PU resistance and easy processing.

RTV 3330 SPU in figures
Shore A 30
medium-hard
350 %
Elongation at break
15 kN/m
Tear resistance
PU-resistant
Special

What distinguishes the RTV 3330 SPU

PU resin resistant
Excellent resistance to polyurethane casting resins, also exothermically crosslinking.
Medium-hard form (Shore A 30)
Better stability than RTV 3318 SPU with the same PU resistance.
Good mechanical properties
15 kN/m tensile strength + 3 MPa tensile strength.
Simple processing
Good fluidity (35,000 mPa·s) — easily degassed and pourable.
Excellent attention to detail
Reproduces intricate details for mass production.
CATA SPU catalyst
150 min pot life, 24 h demoulding — standard workflow.

What is the RTV 3330 SPU used for?

PU casting resin serial molds
Medium-hard molds for PU component mass production.
Industrial replicas
Reusable molds for engineering prototypes.
Wax reproduction
Also suitable for other replication materials such as wax and plaster.
Polyurethane components
Main application in the PU industry.
decorative objects
Complex decorative components in PU.
Souvenir and toy manufacturing
Medium hardness for multiple PU moldings.
Data sheets & safety data sheet
Full TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

processing

1
Stir up the RTV base
Homogenize before use.
2
Dosing CATA SPU
100 parts RTV-SPU + 5 parts CATA SPU. Mix thoroughly.
3
Degas
30–50 mbar vacuum — important for bubble-free molding.
4
Shed
Pour slowly from the lowest point — a pot life of 150 minutes allows for careful processing.
5
Network
Cure for 24 hours at 23 °C / 50% relative humidity. Wait 4 days before the first PU casting to ensure full strength.

Recommended accessories

Bluesil Catalyseur SPU
Special sn catalyst for the SPU series (RTV 3318/3330/3335) — PU casting resin molds.
View product →
Bluesil Additive PC Thixo
Thixotropy additive for Bluesil RTV 3325 (polycondensation) — vertical application.
View product →
Bluesil Diluant 2030
Low viscosity thinner for Bluesil RTV mixture viscosity adjustment.
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.

RTV 3330 SPU 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.

RTV 3335 SPU
Current product		 RTV 3318 SPURTV 3325 →RTV 3430 SB →
Networking system2K Condensation (Sn)2K Condensation (Sn)2K Condensation (Sn)2K Polyaddition (Pt)
Mixing ratio100 : 5 (CATA SPU)100 : 5 (CATA SPU)100 : 5 (Cata)10 : 1
ColorWhitishWhiteWhiteTransparent / grey (B)
Shore A hardnessA 30A 18A 25–28A 28
Elongation at break350 %520 %440–490 %600 %
Tensile strength3.0 MPa3.3 MPa4–4.3 MPa6 MPa
Tear resistance15 kN/m9 kN/m21–26 kN/m20 kN/m
Potting time150 min90–150 min90–150 min (hr)1 h
demolding time24 h24 h24 h (Standard) / 6 h (Fast)10 h
Mixed viscosity35,000 mPa·s25,000 mPa·s35,000 mPa·s20,000 mPa·s
Main applicationPU casting resin serial moldsPolyurethane casting resin moldslost-wax moldsConcrete components (construction)
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Weiss Zinn Mold Making Silicone BLUESIL 2K Silicone ELKEM Swiss Warehouse RTV Base Component 25 kg Polyurethane Condensation SPU PU-resistant Series PU RTV 3330 Shore A 30 medium-hard Promotional Items Toy Mold

Technical data for BLUESIL RTV 3330 SPU 25 kg

All 20 product information 7 Further properties 1 Physical properties 4 Electrical properties 1 Curing values ​​2 Product approvals 2 Mechanical properties 3
Product information
brand Bluesil
Manufacturer Elkem Silicones
Networking type Condensation (tin)
Container 20 kg
Number of components 2K (two-component)
consistency Flowable
Mixing ratio 100:5
Other features
UV resistance No
Physical properties
Paint has hardened White
Self-leveling Yes
Density (g/cm³) 1.25
Viscosity uncrosslinked (mPa·s) 25
Electrical properties
Electrical insulation No
Curing values
Potting time (min) 150
Demolding time (min) 24
Product approvals
Food contact No
Suitable for medical use No
Mechanical properties
Tensile strength (MPa) 2.5
Elongation at break (%) 350
Tensile strength (N/mm) 12

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) 2
Bluesil RTV 3330 SPU - Technical Data Sheet EN.pdf
457 KB
Bluesil RTV 3330 SPU - Fiche Technique FR.pdf
180 KB
Safety Data Sheets (SDS) 3
Bluesil RTV 3330 SPU - Safety Data Sheet DE.pdf
296 KB
Bluesil RTV 3330 SPU - Fiche de Sécurité FR.pdf
502 KB
Bluesil RTV 3330 SPU - Scheda di Sicurezza IT.pdf
492 KB

Frequently asked questions about RTV 3330 SPU

Practical questions regarding processing and design — answered by SILITECH.

Bluesil RTV 3330 SPU: 2K tin silicone (Shore A 30, white) — the medium-hard variant of the RTV-3318/3330/3335-SPU family for PU casting resin serial production. Main applications include PU casting resin serial molds, industrial replicas, and wax reproduction.

Polycondensation crosslinking is a two-component silicone chemistry using a tin catalyst. Upon mixing, the components crosslink, releasing alcohol as a byproduct—this can lead to a small linear shrinkage (typically <0.7%). Advantages: Polycondensation silicones are less sensitive to inhibitors than polyaddition systems—they crosslink even in contact with sulfur-vulcanized rubber and are tolerant of many substrates. It is an established, economical industry standard for lost-wax casting, decorative reproduction, and construction.

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
brand Bluesil
Manufacturer Elkem Silicones
Networking type Condensation (tin)
Container 20 kg
Number of components 2K (two-component)
consistency Flowable
Mixing ratio 100:5
Other features
UV resistance No
Physical properties
Paint has hardened White
Self-leveling Yes
Density (g/cm³) 1.25
Viscosity uncrosslinked (mPa·s) 25
Electrical properties
Electrical insulation No
Curing values
Potting time (min) 150
Demolding time (min) 24
Product approvals
Food contact No
Suitable for medical use No
Mechanical properties
Tensile strength (MPa) 2.5
Elongation at break (%) 350
Tensile strength (N/mm) 12
Keywords
Keywords
Weiss Zinn Mold Making Silicone BLUESIL 2K Silicone ELKEM Swiss Warehouse RTV Base Component 25 kg Polyurethane Condensation SPU PU-resistant Series PU RTV 3330 Shore A 30 medium-hard Promotional Items Toy Mold
Mechanical properties
Shore hardness A30.0 Shore A
Tensile strength3.0 MPa
Elongation at break350.0 %
Tear resistance15.0 kN/m
processing
Viscosity Comp. A35,000 mPa·s
Pot life at 23°C150.0 min
demolding time1440.0 min
Physical & Thermal
Density (23°C)1.25 g/cm³
Temperature resistance (duration)-50 to 200 °C
Peak temperature (short-term)250 °C
storage
Shelf life in original packaging12 months
Storage temperature-5 to 30 °C

Documents and datasheets

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