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CAF 4

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Standard silicone sealant for sealing and bonding applications with good adhesion.

Standard silicone sealant (1K, acetic) for sealing and bonding applications with good adhesion

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  • Manufacturer
  • Networking type
  • Number of components
  • consistency
  • Mixing ratio
  • UV resistance
  • Paint has hardened
  • Self-leveling
  • Electrical insulation
  • Food contact
  • Suitable for medical use
  • Container

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High-temperature resistant flexible bonding white silicone CAF BLUESIL Acetoxy silicone sealant ELKEM industrial Swiss warehouse 1K silicone aviation self-leveling fabric coating

 
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

HS code: 39100000

HS code: 39100000

CAF 4
CAF 4
CAF · Elkem Silicones ·

CAF 4 is a standard silicone sealant (1K, acetic) for sealing and bonding applications with good adhesion.

The Elkem CAF range comprises one-component (1K), moisture-curing silicone sealants – ready-to-use from the cartridge, with high temperature and chemical resistance. CAF 4 is tailored to specific industrial applications – the most important properties and areas of application are listed below.

Proven industry standard

CAF 4 is the industry classic — ready to use, economical, with good adhesion to most standard substrates.

CAF 4 in numbers
1K
Acetic
+200 °C
Length of time
A 30
Shore hardness
Universal
industry

What makes CAF 4 stand out

Industrial classics
Established silicone sealant for general industrial applications.
Acetic 1K system
Ready to use, no mixing required — cross-linking through humidity.
Good adhesion
Adheres to metal, glass, ceramics and many plastics.
Economically
A proven standard choice for non-critical industrial applications.
Rapid skin formation
Fast processing for efficient repair workflows.
Multi-substrate
Versatile use in workshops and service departments.

What is CAF 4 used for?

Industrial maintenance
Standard bonding and sealing in workshop and service.
Glass bonding
Glass-metal connections in industry and commerce.
Sanitary application
Sealing joints in sanitary and HVAC systems.
Repair service
Maintenance and repair of industrial plants.
Furniture and equipment construction
Joining and sealing applications in the furniture and appliance industry.
Multi-material
Flexible sealant for different material combinations.
Data sheets & safety data sheet
Full TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

processing

1
Prepare the substrate
Clean, grease-free, and dry bonding surfaces — degrease with acetone or isopropanol. On copper/zinc: avoid the acetic acid variant (corrosion).
2
Cut the cartridge tip
Cut the tip at an angle to the desired cross-section of the bead. For 310 ml cartridges: Use a standard cartridge gun.
3
Apply
Apply an even bead. For sandwich bonding, apply a thin layer to both sides and join immediately.
4
Smoothing (optional)
Smooth with a smoothing tool or moistened spatula during the skin formation time.
5
Curing
Skin formation typically takes 6–10 minutes, cross-linking reaches 2 mm in 6–8 hours, and is fully cross-linked after 24–72 hours. Cross-linking is accelerated by heat and higher humidity.

Recommended accessories

Bluesil Primer 131
Universal adhesion promoter for stainless steel, aluminum, PMMA and many metals.
View product →
Bluesil ADD 11013
Thixotropy additive for Bluesil RTV 3428 (polyaddition) — vertical application.
View product →

Important instructions

Substrate preparation
Prepare bonding surfaces to be clean, grease-free, and dry. Adhesion is not possible on PE, PP, PTFE, and silicone oils. Conduct a preliminary test for critical material pairings.
Storage & Handling
Store in the unopened original container at 5 to 30 °C in a dry place, protected from sunlight. Consult the current SDS before opening.
Corrosion warning (Acetic)
Acetic crosslinking can attack copper, zinc, and galvanized steels. For corrosion-sensitive metals, choose the neutral variant (CAF 530, CAF 731, or CAF 730).
Application advice
SILITECH will advise you on the optimal CAF variant for your application — substrate pairing, corrosion and temperature requirements, desired appearance and processing workflow.

CAF 4 compared to related CAF products

Networking, mechanics, and temperature directly next to each other — all values ​​from the official Elkem TDS. “— " = not specified in the datasheet.

CAF 4
Current product		 CAF 3 →CAF 1 →CAF 731 →
Networking system1K Acetic1K Acetic1K Acetic1K Neutral (Alkoxy)
ColorBroken whiteTranslucentRedWhite
Shore A hardness37264740
Elongation at break290 %260 %200 %420 %
Tensile strength3.8 MPa1.3 MPa4.4 MPa3.3 MPa
Tear resistance4.5 kN/m2.5 kN/m6.0 kN/m13 kN/m
Skin formation time10 min8 min7 min10 min
Continuous operating temperature.+225 °C+200 °C+225 °C+150 °C
Peak temperature+250 °C+225 °C+300 °C+180 °C
Main applicationIndustrial maintenanceIndustrial maintenanceElectric heating elementsAviation bonding
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
High-temperature resistant flexible bonding white silicone CAF BLUESIL Acetoxy silicone sealant ELKEM industrial Swiss warehouse 1K silicone aviation self-leveling fabric coating

Technical data for CAF 4

All 13 product information 7 Further properties 1 Physical properties 2 Electrical properties 1 Product approvals 2
Product information
brand CAF
Manufacturer Elkem Silicones
Networking type Single-component (humidity)
Number of components 1K (single-component)
consistency Flowable
Mixing ratio Single-component
Container 100 g, 310 ml
Other features
UV resistance No
Physical properties
Paint has hardened White
Self-leveling Yes
Electrical properties
Electrical insulation Yes
Product approvals
Food contact No
Suitable for medical use No

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) 3
CAF 4 - Technical Data Sheet DE.pdf
50 KB
CAF 4 - Technical Data Sheet EN.pdf
603 KB
CAF 4 - Fiche Technique FR.pdf
66 KB
Safety Data Sheets (SDS) 4
CAF 4 - Safety Data Sheet DE.pdf
516 KB
CAF 4 - Safety Data Sheet EN.pdf
420 KB
CAF 4 - Fiche de Sécurité FR.pdf
614 KB
CAF 4 - Scheda di Sicurezza IT.pdf
600 KB

Frequently Asked Questions about CAF 4

Practical application and design questions — answered by SILITECH.

CAF 4: Standard silicone sealant (1K, acetic) for sealing and bonding applications with good adhesion. Main applications are industrial maintenance, glass bonding, and sanitary applications.

Acetic cure (acetic acid crosslinking) means that the 1K system crosslinks through atmospheric moisture and releases small amounts of acetic acid during curing—recognizable by its characteristic odor. Acetic systems are established, economical industry standards with excellent adhesion to glass, ceramics, and many metals. Caution: Acetic acid can cause corrosion on copper, zinc, and electroplated steels—use a neutral variant (e.g., CAF 530, CAF 731, or CAF 730) for these materials.

CAF 4 adheres without a primer to glass, ceramics, many metals (stainless steel, aluminum, copper in neutral variants), and numerous engineering plastics. Adhesion is not possible to PE, PP, PTFE, and silicone oils—these substrates are fundamentally incompatible with silicone. If in doubt, we recommend a preliminary test or consulting SILITECH regarding the specific material pairing.

Prepare the substrate to be clean, grease-free, and dry. Apply the sealant evenly from the cartridge or container—refer to the TDS for skin formation and curing times. Store in the unopened original container at 5 to 30 °C, protected from sunlight. Use opened containers promptly—for Acetic systems, reseal tightly immediately after opening. Consult the current Safety Data Sheet (SDS) before use.

In the comparison table above, you will find related CAF products with adapted properties—different color, different crosslinking system (acetic vs. neutral), or different mechanical properties. If you are unsure about the optimal choice, we would be happy to advise you—contact SILITECH with your requirements (substrate pairing, temperature, corrosion requirements, appearance).

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Product specifications

Product information
Container 100 g or 310 ml
brand CAF
Manufacturer Elkem Silicones
Networking type Single-component (humidity)
Number of components 1K (single-component)
consistency Flowable
Mixing ratio Single-component
Other features
UV resistance No
Physical properties
Paint has hardened White
Self-leveling Yes
Electrical properties
Electrical insulation Yes
Product approvals
Food contact No
Suitable for medical use No
Keywords
Keywords
High-temperature resistant flexible bonding white silicone CAF BLUESIL Acetoxy silicone sealant ELKEM industrial Swiss warehouse 1K silicone aviation self-leveling fabric coating
Mechanical properties
Shore hardness A37.0 Shore A
Modulus at 100% elongation0.8 MPa
Tensile strength3.8 MPa
Elongation at break290.0 %
Tear resistance4.5 kN/m
processing
Viscosity of mixture250,000 mPa·s
Flowability4.0 min
Skin formation time10.0 min
Fully cured after 24 hours4.5 mm
Crosslinking 2 mm layer5.0 h
Physical & Thermal
Density (23°C)1.19 g/cm³
Temperature resistance (duration)-60 to 225 °C
Peak temperature (short-term)250 °C
thermal conductivity0.3 W/(m·K)
Electrical characteristics
Dielectric constant ε (1 kHz)2.9
Dielectric strength21.0 kV/mm
Contact resistance1e+15 Ω·cm
Loss factor tan δ0.002
storage
Shelf life in original packaging24 months
Storage temperature2 to 30 °C

Documents and datasheets

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