Momentive RTV5249 (300-ml-gram-Cart)

RTV5249 One-Component Neutral Cure Silicone Adhesive Sealant

Overview

RTV5249 is a one-component, neutral cure electronic-grade silicone adhesive sealant designed for aerospace, electronics and industrial sealing applications. Based on an alkoxy curing system, it rapidly cures at room temperature to produce a tough, resilient elastomer with excellent adhesion to metals, painted surfaces and plastics without the need for primer in most applications. Offering outstanding resistance to moisture, weathering, ozone and chemicals, RTV5249 maintains long-term flexibility and electrical insulation in demanding service environments.

Key Technical Specs

• Product Type: One-component neutral cure silicone adhesive sealant
• Product Name: RTV5249
• Technology: Alkoxy neutral cure silicone
• Colour: Grey
• Specific Gravity: 1.5
• Hardness: 40 Shore A
• Tensile Strength: 2.2 MPa (320 psi)
• Elongation at Break: 425%
• Service Temperature Range: -59°C to +204°C
• Application Rate: Approximately 300 g/min
• Tack-Free Time: Approximately 45 minutes
• Tooling Time: Approximately 10 minutes

Approvals & Specifications

• UL Recognized Component - File E36952
• Designed for aerospace, automotive, appliance and electronic assembly applications
• Suitable for corrosion-sensitive electrical and electronic equipment

Performance Highlights

• Fast cure�approximately four times faster than conventional alkoxy silicone sealants
• Neutral cure system with low odour methyl alcohol release
• Excellent primerless adhesion to most metals, plastics and painted surfaces
• Outstanding hydrolytic stability with long-term adhesion in moist environments
• Excellent electrical insulation properties
• Resistant to chemicals, ozone, moisture and weathering
• Compatible with sensitive metals and plastics
• High tear resistance with long-term elastomeric flexibility

Typical Applications

• Aerospace electronic assemblies
• Electrical enclosure sealing
• Integrated circuit and semiconductor protection
• Copper connection sealing
• General industrial bonding and sealing
• Moisture-resistant electronic component protection
• Automotive and appliance assembly

Compatibility & Safety Notes

• Primer is generally not required on most metals, plastics and painted surfaces
• SS4179 primer is recommended for difficult plastics and painted substrates where required
• SS4004 or SS4044 primers are recommended for difficult metal substrates
• Do not cure above 43°C as bubbles may form within the sealant
• Clean substrates thoroughly with IPA, MEK or naphtha before application
• Refer to the Safety Data Sheet (SDS) before handling

Application & Curing

• Apply directly from cartridge or bulk dispensing equipment
• Tool within approximately 10 minutes of application
• Tack-Free Time: Approximately 45 minutes
• 3 mm cure depth: Approximately 6 hours
• Full cure and optimum adhesion: Approximately 24 hours (3 mm section)
• Recommended maximum sealant depth: 6 mm
• Use dry tooling only�do not tool with soap or water solutions
• Maximum recommended air pressure for cartridge guns: 45 psi

Packaging & Procurement

• 300 mL cartridges
• 18.1 L (5 gallon) pails
• 162.8 L (55 gallon) drums
• Compatible with manual, pneumatic and bulk dispensing systems

Why This Product is Chosen for AOG / MRO

• Fast curing reduces aircraft maintenance downtime
• Excellent adhesion without primers on many aerospace materials
• Outstanding resistance to harsh environmental conditions
• One-component system eliminates mixing errors and waste
• Excellent electrical insulation for aircraft electronic systems

Practical Suggestions for Your Team

• Clean substrates thoroughly using approved solvents before application.
• Tool the sealant within 10 minutes for the best surface finish.
• Allow a full 24-hour cure whenever possible before placing assemblies into service.
• Avoid curing above 43°C to prevent bubble formation.
• Limit sealant thickness to 6 mm for optimum curing performance.

Manufacturer / Aviation Spec Codes

• Product Name: RTV5249
• Manufacturer: Momentive Performance Materials
• Product Type: One-component neutral cure silicone adhesive sealant
• Primary Application: Aerospace electronic sealing and industrial bonding
• Certification: UL Recognized Component E36952