LOCTITE SI-5970

Main features

25-Minute Tack-Free Time
Oil-Resistant Flexible Gasketing
One-Part No-Mix Application

Product Description

LOCTITE SI 5970 Flange Sealant is a one-part, black, thixotropic alkoxy silicone flange sealant for formed-in-place gasketing on stamped metal covers and other rigid flange assemblies. The moisture-curing RTV material applies without mixing, remains in position after dispensing, and becomes tack free in 25 minutes at 23 deg C and 50% relative humidity. It combines oil resistance with movement capability for timing covers, oil sumps, and similar gasketing joints. Typical cured properties include Shore A 44 hardness, at least 200% elongation, and at least 1.5 N/mm^2 tensile strength.

Key features

25-Minute Tack-Free Time: Becomes tack free within 25 minutes at 23 deg C and 50% relative humidity.
Oil-Resistant Flexible Seal: Supports gasketing joints that require oil resistance and movement capability.
One-Part Thixotropic Paste: Applies without mixing and remains in position after dispensing.

Applications

Applications include formed-in-place gaskets for stamped sheet-metal covers, timing covers, oil sumps, and similar rigid flange assemblies.

TDS, SDS & Technical Documents

Technical Specifications

General Properties

Appearance

Black paste

Chemistry Type

Alkoxy silicone

Component System

Specific Gravity

1.38 to 1.44

Physical Properties

Extrusion Rate

40 to 80 g/min

Tack-Free Time

25 minutes

Mechanical Properties

Elongation

≥200 %

Electrical Properties

Surface Resistivity

1.4×10^16 Ohms/sq

Volume Resistivity

1.8×10^15 Ohms⋅cm

Additional Information

Technical properties

As-supplied properties

Property	Value	Unit	Method / condition
Appearance	Black paste		As supplied
Component count	One		No mixing required
Specific gravity	1.38 to 1.44		25 deg C
Extrusion rate	40 to 80	g/min	0.62 MPa, 15 seconds, 25 deg C, Semco cartridge