Industries

LOCTITE® SI 5970™ – Oxime silicone gasket maker – Automotive flexible flange sealing

  • Item Name: LOCTITE® SI 5970™
  • Manufacturer: Henkel
  • Product Category: Gasketing Sealant
  • Technologies: Silicone (Alkoxy silicone)
  • Applications: Ideal for gasketing applications in automotive and industrial settings where resistance to engine oils and high joint movement is required.
  • Color: Black paste
  • Cure Type: Room temperature vulcanizing (RTV)
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: Contact Techniq VN for details.

1. Product Overview

LOCTITE® SI 5970™ is a one-component, room temperature vulcanizing (RTV) alkoxy silicone gasket sealant. It offers excellent oil resistance and withstands high joint movements. It is designed for gasketing applications, particularly in automotive engines where low-pressure testing is required before full curing.

2. Applications

  • Used for stamped sheet metal covers such as timing covers and oil sumps
  • Ideal where good oil resistance and high flexibility are needed
  • Suitable for low-pressure tests before curing

3. Typical Properties

Uncured Properties

Property Value
Specific Gravity 1.38 – 1.44
Appearance Black paste
Cure Type Moisture cure (RTV)
Thixotropy Reduced migration after application
Extrusion Rate 40 – 80 g/min

Curing Performance

  • Tack-free time: ~25 minutes at 23°C, 50% RH
  • Full cure: ~7 days
  • Depth of cure: Increases with time (10 mm max depth)

Cured Properties

Property Value
Shore Hardness (A) 44
Elongation (%) ≥200
Tensile Strength (N/mm²) ≥1.5 (≥278 psi)
Surface Resistivity (Ω) 1.4×10¹⁶
Volume Resistivity (Ω·cm) 1.8×10¹⁵

Adhesion Strength (Lap Shear, Cured 21 Days @ 23°C, 50% RH)

Substrate Strength (N/mm²) Strength (psi)
Mild Steel 1.3 – 2.0 190 – 290
Aluminum 2024-T3 0.7 – 1.3 100 – 190
Alclad 1.0 – 1.8 145 – 260
Zinc Dichromate 1.5 – 2.0 220 – 290
Novalac Thermoset 0.8 – 1.5 120 – 220
Nylon 66 (30% Glass Filled) 0.1 – 0.2 15 – 30
Polyphenylene Sulphide 0.8 – 1.1 120 – 160

Environmental Resistance (Strength Retention @ 150°C / 200°C for 1000 Hours)

  • Oil Resistance (5W30 Motor Oil): Retains ~55 – 70% of original strength
  • Water/Glycol Resistance (120°C): Retains ~45 – 70% of original strength
  • Heat Aging (Air @ 150°C): Retains ~130 – 170% of initial strength

BERGQUIST microTIM mTIM 1028 Thermal Interface Coating High performance thermal management solution for nickel finished heat sinks, optical transceivers, and data center liquid cooling systems

BERGQUIST microTIM mTIM 1028 is purpose built for riding cage assemblies in servers, switches, and routers, interfacing with electroless nickel plated copper or aluminum heat sinks. It ensures stable operation in high power transceiver modules while also extending applicability to liquid cooling components, heat pipes, and fin based dissipative structures.

RELATED PRODUCT

Contact Technical Support

Leave your information or connect via Hotline, and our expert team will reach out immediately to provide professional consultation and customized solutions.

(+84) 889 901 929

Email: info@techniq.vn

Our Technical Support Team is on hand from 8:30 AM to 5:30 PM (GMT+7).

For requests outside these hours, please submit your request form and we will respond at the earliest opportunity.