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LOCTITE® SI 5660™ – Oxime silicone gasket maker – Automotive flexible flange sealing

  • Item Name: LOCTITE® SI 5660™
  • Manufacturer: Henkel Corporation
  • Product category: Sealing adhesive (RTV silicone) for gasketing
  • Technologies: Moisture-curing silicone with thixotropic properties that minimizes migration and provides excellent resistance to oils and coolants
  • Applications: Designed for gasketing in applications such as transmissions and cast metal housings where durability and oil/coolant resistance are required.
  • Color: Not specified
  • Cure type: Room temperature vulcanizing (RTV)
  • Package size: Contact to Techniq VN for details
  • Shelf life: Contact to Techniq VN for details

1. Product Overview

LOCTITE® SI 5660™ is a one-component, moisture-curing silicone sealant with a thixotropic nature to prevent migration after application. It is designed for gasketing applications requiring resistance to oils and coolants. Key features include:

  • Technology: Silicone
  • Appearance: Grey, lump-free paste
  • Curing: Room temperature vulcanizing (RTV)
  • Application: Sealing
  • Key Benefits: Non-corrosive, high flexibility, good environmental resistance

2. Applications

LOCTITE® SI 5660™ is ideal for:

  • Sealing transmissions and cast metal housings
  • Gasketing applications requiring durability in oil and coolant exposure
  • Situations where reduced migration of liquid sealant is beneficial

3. Typical Properties

Uncured Properties

Property Value
Specific Gravity @ 25°C 1.5
Extrusion Rate (g/min) 200 – 700
Tack-Free Time @ 25°C, 50% RH (min) ≤ 60

Cured Properties (after 7 days @ 25°C, 50% RH)

Property Value
Shore Hardness (Durometer A) 45 – 75
Linear Shrinkage (in/in) 1.13
Thermal Conductivity (W/m·K) 0.63
Tensile Strength (N/mm²) 2.4 – 3.8 (348 – 550 psi)
Elongation at Break (%) ≥ 100

Adhesion Strength (Lap Shear, N/mm²)

Substrate Strength (N/mm²) Strength (psi)
Mild Steel 1.8 260
Aluminum (grit blasted) 1.7 245
Stainless Steel 0.9 130
Zinc Plated Steel 1.6 230
ABS 0.3 44
Nylon 0.2 30
Phenolic 1.0 145
Silicone 0.2 30

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