Adhesive / Sealant

Loctite 5188 Flange Sealant

Name: Loctite 5188 Flange Sealant
Brand: Hong Teck Hin
Availability: InStock

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Description

LOCTITE 5188 is a commercial-grade, highly flexible anaerobic sealant engineered specifically for rigid metal flanged connections. It cures efficiently when confined in the absence of air between close-fitting metal surfaces, delivering an instant, low-pressure seal immediately after assembly. Designed to optimize high-volume production lines, this form-in-place gasketing product excels on gearboxes, transmissions, and motor casings.

Its specialized, highly flexible formula achieves superior adhesion on aluminum and steel, making it ideal for demanding applications subject to structural vibration or thermal stress.

Key Features & Benefits

High Flexibility & Adhesion: Engineered for rigid metal flanges, offering exceptional performance and superior adhesion on aluminum substrates.
Oil Contamination Tolerance: Formulated to maintain full sealing integrity even when minor oil contamination is present on the flange surfaces.
Instant Sealing Capability: Provides immediate resistance to low online test pressures (<0.05 MPa) right after assembly before curing occurs.
Excellent Chemical Resistance: Formulated to withstand harsh chemical environments without shrinking, cracking, or losing joint tension.

Technical Specifications

Product Designation: LOCTITE 5188
Chemical Type: Anaerobic
Color: Red
Application: Sealing
Key Substrates: Metal (Aluminum, Steel)
Tensile Shear Strength: 7 N/mm²
Viscosity Range: 14,000 - 32,000 mPa·s (cP)
Operating Temperature Range: -65°F to +300°F
Optimal Storage Temperature: 8°C to 21°C (Storage below 8°C or greater than 28°C can adversely affect product properties)

Usage & Application Guidelines

Surface Preparation: For maximum performance, ensure all flange faces are clean, dry, and free from heavy grease. Before surface bonding, verify the compatibility of any aqueous washing solutions used, as some washes can affect product cure and performance.
Application Method: Apply manually by screen printing, roller coating, or bead dispense. Tighten flanges as soon as possible after assembly to avoid shimming.
Substrate Limitations: This product is not recommended for use on plastic substrates, particularly thermoplastic materials, where stress cracking could occur.

Safety Warning: LOCTITE 5188 is not recommended for use in pure oxygen and/or oxygen-rich systems and must not be selected as a sealant for chlorine or other strong oxidizing materials. Consult the Safety Data Sheet (SDS) for safe handling information.

Frequently Asked Questions (FAQ)

Can LOCTITE 5188 be used on assemblies with minor oil contamination?

Yes. LOCTITE 5188 is engineered with a high tolerance for minor oil contamination on flange surfaces. However, for maximum structural adhesion and optimal chemical resistance, surfaces should be kept as clean and free from heavy industrial grease as possible.

What is the instant sealing capability of LOCTITE 5188 before it cures?

LOCTITE 5188 provides an immediate, low-pressure instant seal right after assembly while still uncured. Low online test pressures of less than 0.05 MPa can be applied immediately to confirm a complete seal and streamline production floor testing.

How do large bond gaps affect the cure speed of LOCTITE 5188?

The rate of anaerobic cure is directly affected by the bondline gap. If large gaps result in an unacceptably slow cure time, a Loctite activator can be applied to speed up the process. Because activators can alter the ultimate tensile shear strength, the specific gap and application conditions should be evaluated beforehand.

What are the explicit industrial storage parameters for LOCTITE 5188?

LOCTITE 5188 must be stored in its unopened original container in a dry location at an optimal temperature range of 8°C to 21°C. Storage below 8°C or above 28°C can irreversibly degrade the adhesive's physical properties. Never return any material removed from the container back into the original packaging to prevent contamination.