LOCTITE® 515 Gasket Flange Sealant | 50ml | LOC515 | Anaerobic Form-In-Place Gasket

Medium-Strength Purple Flange Sealant for Close-Fitting Rigid Metal Flanges, Housings, Pumps and Mechanical Assemblies

Supply Solutions Group supplies LOCTITE® 515 Gasket Flange Sealant – 50ml (LOC515) to organisations operating across manufacturing, engineering, automotive, mining, oil and gas, power generation, industrial maintenance and mechanical workplaces throughout Australia.

LOCTITE 515 is a professional anaerobic flange sealant designed to create form-in-place gaskets between close-fitting rigid metal faces and machined flanges.

Manufactured by Henkel, LOCTITE 515 cures when it is confined in the absence of air between close-fitting metal surfaces.

The product fills microscopic surface irregularities and the small spaces between mating flange faces, helping form a reliable seal without requiring a traditional pre-cut gasket for suitable assemblies.

LOCTITE 515 is supplied as a purple, thixotropic gel.

Its thixotropic consistency helps reduce migration after application, allowing technicians to apply a controlled bead directly to the mating flange.

Henkel specifies a maximum gap fill of approximately:

0.25mm / 0.01"

This makes the product particularly suited to close-fitting machined rigid metal flanges.

LOCTITE 515 also provides immediate resistance to low pressures after flange assembly, allowing the joint to begin sealing before the anaerobic compound has reached full cure.

Typical fixture time is approximately:

30 minutes

Actual curing speed depends on substrate, temperature, gap size and environmental conditions.

LOCTITE 515 is identified by Henkel as a medium-strength gasket sealant.

Once cured, the sealant remains capable of accommodating minor flange movement while maintaining sealing performance.

Typical applications include form-in-place gasketing for:

• Pumps

• Thermostats

• Compressors

• Transmission housings

• Axle covers

• Rigid machinery housings

• Machined metal flanges

Henkel recommends the product for suitable steel and aluminium surfaces.

The cured gasket helps prevent leakage while eliminating many of the fit and alignment limitations associated with conventional pre-cut gaskets.

Another useful feature is UV fluorescence.

LOCTITE 515 fluoresces under ultraviolet light, allowing technicians and quality-control personnel to visually confirm the presence and continuity of the applied sealant bead.

This can be particularly useful in manufacturing and assembly operations where gasket application needs to be inspected before components are fully assembled.

The convenient 50ml tube provides a practical workshop quantity for maintenance teams, mechanics, engineers and technicians completing routine flange-sealing work.

This listing contains 1 × 50ml Tube of LOCTITE 515 Gasket Flange Sealant – LOC515.

As an Indigenous-owned industrial supplier and procurement partner, Supply Solutions Group provides LOCTITE flange sealants, gasket makers, threadlockers, retaining compounds, adhesives, lubricants and industrial maintenance consumables backed by responsive customer service, procurement support and Australia-wide business supply capability.

Product Type

• Product Type: Anaerobic Flange Sealant

• Brand: LOCTITE®

• Manufacturer: Henkel

• Product: LOCTITE 515

• Product Reference: LOC515

• Pack Size: 50ml

• Packaging: Tube

• Technology: Acrylate / Methacrylate

• Cure Type: Anaerobic

• Components: One Component

• Strength: Medium

• Physical Form: Gel

• Colour: Purple

• Thixotropic: Yes

• Maximum Gap Fill: 0.25mm

• Typical Fixture Time: 30 Minutes

• Recommended Substrates: Aluminium & Steel

• UV Fluorescent: Yes

• Primary Application: Rigid Flange Gasketing

• Immediate Low-Pressure Resistance: Yes

Key Features

• Genuine LOCTITE® industrial gasket sealant

• LOCTITE 515

• 50ml tube

• LOC515 product reference

• Anaerobic curing technology

• Form-in-place gasket

• Designed for rigid metal flanges

• Suitable for machined metal surfaces

• One-component formulation

• No mixing required

• Medium-strength sealant

• Purple colour

• Thixotropic gel

• Helps reduce product migration

• Gap filling up to 0.25mm

• Typical fixture time of approximately 30 minutes

• Immediate resistance to low pressure after flange assembly

• Suitable for steel

• Suitable for aluminium

• Flexes with minor flange movement

• Helps prevent flange leakage

• Suitable for pumps

• Suitable for thermostats

• Suitable for compressors

• Suitable for transmission housings

• Suitable for axle covers

• Fluorescent under UV light

• Supports quality-control inspection

• Suitable for manufacturing

• Suitable for industrial maintenance

• Suitable for automotive applications

Technical Specifications

Specification Details
Brand	LOCTITE®
Manufacturer	Henkel
Product	515
Product Type	Gasket / Flange Sealant
Product Reference	LOC515
Pack Size	50ml
Packaging	Tube
Technology	Acrylate
Chemical Base	Methacrylate
Cure Type	Anaerobic
Components	One Component
Strength	Medium
Physical Form	Gel
Colour	Purple
Thixotropic	Yes
Maximum Gap Fill	0.25mm
Typical Fixture Time	30 Minutes
Recommended Substrates	Steel & Aluminium
Lap Shear Strength	Approx. 6.0 N/mm²
UV Fluorescent	Yes
Immediate Low-Pressure Resistance	Yes
Storage Temperature	8°C to 21°C
Primary Application	Rigid Assembly Gasketing & Sealing

Typical Applications

• Pumps

• Thermostats

• Compressors

• Transmission housings

• Axle covers

• Machined flange sealing

• Gearbox housings

• Machinery covers

• Equipment housings

• Rigid metal joints

• Aluminium flange assemblies

• Steel flange assemblies

• Automotive maintenance

• Industrial manufacturing

• Mechanical repairs

• Plant maintenance

• Equipment servicing

• General flange gasketing

Suitable Industries

• Manufacturing

• Engineering

• Automotive

• Mining and resources

• Oil and gas

• Power generation

• Industrial maintenance

• Heavy equipment

• Mechanical workshops

• Equipment manufacturing

• Plant maintenance

• Transport

• Infrastructure

• Utilities

• Remanufacturing

• Maintenance and repair

• Trades and contracting

Why Choose LOCTITE® 515 Flange Sealant?

LOCTITE 515 provides a convenient alternative to conventional pre-cut gaskets for suitable close-fitting rigid metal flanges.

Traditional gasket materials must be cut or selected to match the exact geometry of the mating components.

A liquid or gel form-in-place gasket can instead conform directly to the flange profile.

LOCTITE 515 fills surface irregularities between the mating components and then cures anaerobically after assembly.

This creates a gasket precisely matched to the joint geometry.

Anaerobic Cure Technology

LOCTITE 515 uses anaerobic curing technology.

The sealant cures when it is:

• Confined between close-fitting surfaces

• In contact with appropriate metal

• Deprived of air

While exposed to air, the product remains uncured.

After the flange is assembled, oxygen is excluded from the joint and curing begins.

This makes anaerobic technology particularly well suited to rigid metal flange assemblies.

Form-In-Place Gasket

LOCTITE 515 functions as a:

Form-In-Place Gasket

The material is applied directly to one mating flange before assembly.

Once the parts are joined and the material cures, the sealant conforms to the flange geometry and fills the small spaces that could otherwise form leakage paths.

Potential benefits include:

• Conforms to flange shape

• Eliminates cutting of suitable preformed gaskets

• Helps seal surface imperfections

• Reduces leakage paths

• Simplifies gasket inventory

• Useful for complex flange shapes

Gap Filling up to 0.25mm

Henkel specifies a maximum gap fill of:

0.25mm / 0.01"

This means LOCTITE 515 is primarily designed for close-fitting rigid flanges rather than large or flexible flange gaps.

Flange condition and flatness should be checked before application.

Typical 30-Minute Fixture Time

Henkel specifies a typical fixture time of approximately:

30 minutes

Fixture time is the period required for the adhesive or sealant to develop sufficient initial strength for handling under the stated test conditions.

Fixture time is not the same as full cure.

Full curing time depends on:

• Substrate

• Temperature

• Gap

• Activator use

• Application conditions

Immediate Low-Pressure Sealing

LOCTITE 515 provides resistance to low pressures immediately after flange assembly.

This helps the joint provide an initial seal while the anaerobic gasket continues curing.

Final operating conditions should always account for complete cure requirements and equipment-manufacturer instructions.

Medium Strength

Henkel identifies LOCTITE 515 as a:

Medium-Strength Gasket Sealant

The product creates a durable flange seal while allowing appropriate maintenance and disassembly with standard service procedures.

The required dismantling effort will depend on:

• Flange design

• Surface area

• Cure conditions

• Assembly geometry

• Service exposure

Purple Gel

LOCTITE 515 is supplied as a:

Purple Gel

The gel consistency helps the material remain positioned where applied.

Its thixotropic behaviour helps prevent excessive running from the flange before assembly.

Suitable for Steel & Aluminium

Henkel specifically recommends LOCTITE 515 for appropriate:

• Steel

• Aluminium

These are common materials in:

• Pumps

• Transmission housings

• Gearboxes

• Engine assemblies

• Machinery

• Industrial equipment

The surfaces should be properly prepared before application.

UV Fluorescent for Inspection

LOCTITE 515 fluoresces under UV light.

This allows technicians to inspect the applied bead before or during quality-control procedures.

UV fluorescence can help confirm:

• Sealant presence

• Bead continuity

• Application coverage

• Process consistency

This is particularly valuable in manufacturing and repeat assembly operations.

Flange Movement

Henkel states that LOCTITE 515 will flex with minor flange movements.

This helps maintain sealing performance where small relative movements occur during service.

It should still be used only on flange designs and applications compatible with anaerobic rigid-flange sealants.

Common Pump Applications

Pumps contain numerous rigid housing and cover joints that require effective sealing.

LOCTITE 515 is commonly used for appropriate:

• Pump housings

• Covers

• Machined interfaces

The form-in-place gasket can fill minor surface imperfections while helping prevent fluid leakage.

Transmission & Axle Applications

Henkel specifically lists:

• Transmission housings

• Axle covers

among typical LOCTITE 515 applications.

These rigid mechanical assemblies often use accurately machined flange surfaces that suit anaerobic gasket technology.

Surface Preparation

For reliable flange sealing:

1. Remove the old gasket or sealant where required.

2. Clean both mating surfaces.

3. Remove oil, grease and contamination.

4. Inspect flange faces for damage.

5. Ensure the gap is within the product capability.

6. Apply LOCTITE 515 according to Henkel instructions.

7. Assemble the flange.

8. Tighten fasteners according to the equipment manufacturer’s sequence and torque.

9. Allow appropriate curing time before demanding service.

Always refer to the current Henkel Technical Data Sheet for detailed application guidance.

Activator Considerations

Anaerobic curing speed depends partly on substrate activity and temperature.

Passive metals or low temperatures may slow cure.

Where required, Henkel-approved activators can be used according to the current manufacturer instructions.

Activator selection should be based on the exact material and application.

Storage

Henkel specifies a recommended storage temperature of approximately:

8°C to 21°C

For best product condition:

• Keep in the original container

• Store in a dry location

• Keep the tube properly closed

• Avoid excessive heat

• Protect from contamination

• Follow the expiry information printed on the package

Material removed from the container should not be returned to the original tube.

Important Application Limitations

LOCTITE 515 is specifically designed for close-fitting rigid metal flange assemblies.

Do not assume suitability for:

• Large flange gaps

• Highly flexible joints

• Plastic housings

• Rubber joints

• Moving interfaces

• Applications requiring a thick compressible gasket

Where greater gap filling or flexible silicone gasketing is required, a different LOCTITE gasketing technology may be more appropriate.

Important Safety Information

LOCTITE 515 is an industrial chemical product and should be used according to the current Henkel Safety Data Sheet.

Users should:

• Read the current product label and SDS before use

• Avoid unnecessary skin contact

• Avoid eye contact

• Wear suitable PPE identified by the workplace risk assessment

• Maintain appropriate ventilation

• Wash hands after handling

• Keep the container closed when not in use

• Store according to manufacturer requirements

• Dispose of waste appropriately

Why Buy from Supply Solutions Group?

Supply Solutions Group is an Indigenous-owned Australian supplier of industrial adhesives, gasket sealants, threadlockers, retaining compounds, lubricants and maintenance consumables, providing LOCTITE products backed by procurement support and Australia-wide business supply capability.

Benefits of Partnering with Supply Solutions Group

• Australia-wide business supply capability

• Indigenous-owned and operated business

• Genuine LOCTITE product supply

• Henkel industrial products

• Flange sealants

• Form-in-place gasket products

• Engineering adhesives

• Automotive maintenance consumables

• Industrial sealing products

• Mining maintenance products

• Manufacturing consumables

• Mechanical workshop products

• Threadlockers

• Retaining compounds

• Thread sealants

• Anti-seize lubricants

• Procurement support services

• Trade account options

• Bulk purchasing solutions

• Product sourcing assistance

• Responsive customer service

• Ongoing commercial supply arrangements

Frequently Asked Questions

What is LOCTITE 515?
LOCTITE 515 is a medium-strength anaerobic flange sealant designed to form gaskets between close-fitting rigid metal flanges.

How much product is supplied?
This listing contains 1 × 50ml tube.

Is LOCTITE 515 a gasket maker?
Yes. It is a form-in-place gasket sealant for suitable rigid metal flange assemblies.

What colour is LOCTITE 515?
Henkel specifies purple.

What consistency is LOCTITE 515?
It is supplied as a thixotropic gel.

Does LOCTITE 515 require mixing?
No. It is a one-component product.

How does LOCTITE 515 cure?
It cures anaerobically when confined between close-fitting metal surfaces in the absence of air.

What gap can LOCTITE 515 fill?
Henkel specifies gap filling up to approximately 0.25mm / 0.01".

How long is the fixture time?
Henkel specifies a typical fixture time of approximately 30 minutes.

Does 30 minutes mean it is fully cured?
No. Fixture time and full cure are different. Full cure depends on substrate, gap, temperature and other application conditions.

Does LOCTITE 515 seal immediately?
Henkel states that it provides resistance to low pressures immediately after assembly.

Is LOCTITE 515 medium strength?
Yes. Henkel classifies it as a medium-strength flange sealant.

Can LOCTITE 515 be used on steel?
Yes. Steel is one of Henkel’s recommended substrates.

Can it be used on aluminium?
Yes. Aluminium is also manufacturer-recommended.

Can it be used on pumps?
Yes. Pumps are specifically listed by Henkel as a typical application.

Can it be used on transmission housings?
Yes. Transmission housings are among Henkel’s listed applications.

Can it be used on axle covers?
Yes.

Can it be used on compressors?
Yes. Compressors are also manufacturer-listed.

Can it be used on thermostats?
Yes. Thermostats are included in Henkel’s typical application examples.

Does LOCTITE 515 remain flexible?
Henkel states that the cured seal will flex with minor flange movements.

Is the product fluorescent?
Yes. LOCTITE 515 fluoresces under UV light.

Why does UV fluorescence matter?
It allows the applied sealant bead to be visually inspected during assembly and quality-control processes.

What is the lap shear strength?
Henkel lists approximately 6.0 N/mm² under the specified test conditions.

How should LOCTITE 515 be stored?
Henkel specifies a storage range of approximately 8°C to 21°C.

Can LOCTITE 515 replace every paper gasket?
No. It is intended for suitable close-fitting rigid metal flanges. Joint design and manufacturer requirements must be checked before replacing a conventional gasket.

Is LOCTITE 515 the same as silicone RTV gasket maker?
No. LOCTITE 515 uses anaerobic methacrylate technology, while RTV gasket makers use silicone chemistry and have different gap-filling and flexibility characteristics.

Can Supply Solutions Group provide larger quantities?
Yes. Bulk and ongoing supply arrangements are available for manufacturers, engineering companies, automotive workshops, mine sites and industrial maintenance businesses.

Can Supply Solutions Group supply other LOCTITE gasketing products?
Yes. Supply Solutions Group can assist with LOCTITE 515, 518, SI 587 and other flange-sealing and gasketing products, subject to availability.