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CAF 731

CAF 731

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Neutral-curing 1K silicone sealant (alkoxy, white) — thixotropic, primer-free, corrosion-free for aerospace and electronics

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Electronics White Silicone CAF BLUESIL Silicone Sealant ELKEM Industrial Swiss Bearing 1K Silicone Aerospace Neutral Metal-friendly Low Odor Alkoxy Self-adhesive Primerless Repair Kapton Plastic Bonding High Tear Resistance

 
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 731
CAF 731
CAF · Elkem Silicones ·

ELKEM CAF 731 is a neutral-curing 1K silicone sealant (alkoxy, white) — thixotropic, primer-free, corrosion-free for aerospace and electronics.

The Elkem CAF series comprises one-component (1K), neutral (alkoxy) curing silicone sealants — no acetic acid odor, no corrosion on copper and sensitive metals, preferred in electronics and automotive applications. CAF 731 is tailored to specific industrial applications — the most important properties and areas of application are listed below.

Excellent mechanical properties

CAF 731 combines neutral (alkoxy) crosslinking with excellent mechanical properties — elongation at break 420%, tensile strength 13 kN/m. The right choice for demanding bonding applications with corrosion and odor requirements.

CAF 731 in numbers
Neutral
Alkoxy
White
Color
420 %
Elongation at break
A 40
Shore hardness

What distinguishes CAF 731

Neutral & corrosion-free
Alkoxy crosslinking — no attack on copper, non-ferrous metals and sensitive components.
Odorless
Pleasant in the workplace — no exposure to acetic acid.
Primer-free adhesion
Excellent adhesion to many substrates without pretreatment.
High elongation at break 420%
Withstands differential movements between materials with different thermal expansion rates.
Excellent mechanical properties
Tear strength 13 kN/m, tensile strength 3.3 MPa — demanding industrial applications.
Thixotropic
Stable on vertical surfaces without dripping.

What is CAF 731 used for?

Aviation bonding
Bonding and sealing in the aerospace industry.
Electronic components
Flexible bonding and protection of electronic components.
Industrial repair
Repair work in industry and transport with corrosion requirements.
Multi-material connections
Flexible connection of glass, metal, and plastic with thermal length change.
Sensor and actuator bonding
Sensitive components with corrosion protection.
Plant construction
Service and maintenance bonding in industry.
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
Bonding surfaces must be clean, grease-free, and dry — degrease with acetone or isopropanol. Neutral curing is safe on copper and non-ferrous metals.
2
Cut the cartridge tip
Cut the tip to the desired cross-section of the caterpillar and insert it into a standard cartridge gun.
3
Apply
Apply an even bead, immediately join the surfaces.
4
Smoothing (optional)
Smooth with a smoothing tool within the skin formation time (10–15 min).
5
Curing
Skin formation 10–15 min, cross-linking 2 mm in 8 h, fully cross-linked after 72 h. Odorless — no acetic acid odor.

Recommended accessories

Bluesil Primer 131
Universal adhesion promoter for stainless steel, aluminum, PMMA and many metals.
View product →
Bluesil Primer PM 820
High-performance primers for polar plastics (PA, PES, ABS, PP) and composites.
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 731 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 731
Current product		 CAF 730 MF →CAF 530 White →CAF 530 Black →
Networking system1K Neutral (Alkoxy)1K Neutral (Oxim)1K Neutral (Alkoxy)1K Neutral (Alkoxy)
ColorWhiteWhiteWhiteBlack
Shore A hardness40253434
Elongation at break420 %400 %450 %450 %
Tensile strength3.3 MPa1.9 MPa3.5 MPa3.5 MPa
Tear resistance13 kN/m4.0 kN/m15 kN/m15 kN/m
Skin formation time10 min7 min10–15 min10–15 min
Continuous operating temperature.+150 °C+200 °C+180 °C+180 °C
Peak temperature+180 °C+225 °C+200 °C+200 °C
Main applicationAviation bondingAviation maintenanceElectronic bondingElectronics with a black look
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Electronics White Silicone CAF BLUESIL Silicone Sealant ELKEM Industrial Swiss Bearing 1K Silicone Aerospace Neutral Metal-friendly Low Odor Alkoxy Self-adhesive Primerless Repair Kapton Plastic Bonding High Tear Resistance

Technical specifications for CAF 731

All 13 product information 7 Further properties 1 Physical properties 2 Electrical properties 1 Product approvals 2
Product information
brand CAF
Networking type Single-component (humidity)
Container 100 g, 310 ml
Number of components 1K (single-component)
consistency Thixotropic
Mixing ratio Single-component
Manufacturer Elkem Silicones
Other features
UV resistance No
Physical properties
Paint has hardened White
Self-leveling No
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) 2
CAF 731 - Technical Data Sheet EN.pdf
618 KB
CAF 731 - Fiche Technique FR.pdf
171 KB
Safety Data Sheets (SDS) 4
CAF 731 - Safety Data Sheet DE.pdf
168 KB
CAF 731 - Safety Data Sheet EN.pdf
335 KB
CAF 731 - Fiche de Sécurité FR.pdf
266 KB
CAF 731 - Scheda di Sicurezza IT.pdf
260 KB

Frequently asked questions about CAF 731

Practical application and design questions — answered by SILITECH.

ELKEM CAF 731: Neutral-curing 1K silicone sealant (alkoxy, white) — thixotropic, primer-free, corrosion-free for aerospace and electronics. Main applications include aerospace bonding, electronic components, and industrial repair.

Neutral curing (alkoxy) means that the 1K system cures through atmospheric moisture, releasing only alcohols (instead of acetic acid). Advantages: no aggressive odor in the workplace, no corrosion on copper, non-ferrous metals, and electrogalvanized steels, very good adhesion to electronic components. Preferred choice for electronics, automotive sensors, solar modules, and all applications with corrosion-sensitive metals.

CAF 731 adheres without 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
Networking type Single-component (humidity)
Number of components 1K (single-component)
consistency Thixotropic
Mixing ratio Single-component
Manufacturer Elkem Silicones
Other features
UV resistance No
Physical properties
Paint has hardened White
Self-leveling No
Electrical properties
Electrical insulation Yes
Product approvals
Food contact No
Suitable for medical use No
Keywords
Keywords
Electronics White Silicone CAF BLUESIL Silicone Sealant ELKEM Industrial Swiss Bearing 1K Silicone Aerospace Neutral Metal-friendly Low Odor Alkoxy Self-adhesive Primerless Repair Kapton Plastic Bonding High Tear Resistance
Mechanical properties
Shore hardness A40.0 Shore A
Modulus at 100% elongation1.0 MPa
Tensile strength3.3 MPa
Elongation at break420.0 %
Tear resistance13.0 kN/m
processing
Flowability2.0 min
Skin formation time10.0 min
Fully cured after 24 hours3.5 mm
Crosslinking 2 mm layer8.0 h
Physical & Thermal
Density (23°C)1.3 g/cm³
Temperature resistance (duration)-60 to 150 °C
Peak temperature (short-term)180 °C
storage
Shelf life in original packaging12 months
Storage temperature2 to 30 °C

Documents and datasheets

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