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Henkel Loctite Adhesives

Nowadays, if you want to create added value, an excellent product portfolio simply is not good enough. You need a partner who understands your business and your products, who develops new production techniques, optimizes your processes together with you and designs tailor-made system solutions.

A partner who can make a real contribution to long-lasting value creation for you:

Henkel – the worldwide market leader in adhesives, sealants and surface treatment. Get access to our unique and comprehensive product portfolio, benefit from our expertise and guarantee your highest process reliability. The General Industry Business fulfils specific industry and maintenance needs from one source.


Instant Bonding

Why use a Loctite® Instant Adhesive?

Instant adhesives, or cyanoacrylates, cure very quickly when confined between surfaces. Surface humidity on the substrates triggers the cure reaction, which moves from the substrate surfaces towards the middle of the adhesive joint. Cyanaoacrylates are chosen for bonding small parts to achieve extremely fast fixturing. Due to their limited gap filling capacity they require close fitting surfaces. Their adhesion to most substrates is excellent and the bonding strength in shear and tensile mode is very good. They should not be used on float glass or glazed ceramics, but can be used on GRP plastics. Bonds continuously exposed to water need proper adhesive selection and ageing evaluation.

Advantages of Loctite® Instant Adhesives:

• Clean and easy to apply

• Very fast positioning and fixturing of parts

• Joining a wide variety of dissimilar materials

• Excellent adhesion on a wide range of substrates, especially plastics and rubbers. Special formulations are available for bonding metals or porous substrates. Primer Loctite® 770 offers to improve adhesion on difficult-to-bond materials such as PP, PE, POM, PTFE, or silicone

• High strength on very small bond faces

• Free of solvents

• Do not require complex part geometries, e.g. for snap-fits

 


ThreadLocking

Why use a Loctite® Threadlocker?

Loctite® threadlocking products prevent self-loosening and secure any threaded fastener against vibration and shock loads. They are easy-flowing liquids which completely fill the gaps between mating threads. When used to assemble threaded fasteners, Loctite® Threadlockers permanently secure threaded assemblies and eliminate fretting corrosion by creating a unitised assembly.

Loctite® Threadlockers are much superior to traditional mechanical locking methods:

• Mechanical devices, e.g. split pins, tab washers: Only used to prevent the loss of nuts and bolts

• Friction devices: add to absolute elasticity and/or increase friction; but will not ensure permanent threadlocking under dynamic loads

• Locking devices, like tooth flanged and ribbed flanged bolts, nuts and washers: They prevent self-loosening, but are expensive and need larger flange-bearing surfaces; and they may damage the surfaces.

Loctite® Threadlockers are single-component liquid and semi-solid adhesives. They cure at room temperature to a hard solid thermoset plastic when applied between steel, aluminium, brass and most other metal surfaces. They cure in the absence of air. The adhesive completely fills the gaps between mating threads to lock threads and joints.

Advantages of Loctite® Threadlockers as compared to traditional mechanical locking devices:

• Prevent unwanted movement, loosening, leaks, and corrosion

• Resist vibration

• Single-component – clean and easy to apply

• Can be used on all sizes of fasteners – reduces inventory costs

• Seal threads – allow through-hole tapping


Pipe and Thread Sealing

Why use a Loctite® Thread Sealant?

Loctite® Thread Sealants, available in liquid form or as sealing cord, prevent leakage of gasses and liquids. Designed for low and high pressure applications, they fill the space between threaded parts and provide an instant, low pressure seal. When fully cured, they seal to the burst pressure of most pipe systems.

Loctite® Sealants are much superior to traditional sealant types:

• Solvent-based sealing compounds: Shrink during cure as solvents evaporate. Fittings must

be re-torqued to minimise voids. They lock the assembly by a combination of friction and

deformation.

• PTFE tape: Lubricates in off direction, allowing fittings to loosen under dynamic loads and

resulting in loss of clamping force and leakage. Dynamic loads may accelerate creep, causing

leakage over time. The lubricating effect of PTFE frequently results in over-tightening of

fasteners, adding stress or causing breakage of parts. Application requires good professional

skills to avoid stressing fittings or castings.

• Hemp & Paste: are slow to apply and require a lot of expertise, are messy to assemble, and

interfere with the torque needed to obtain the correct pre-stress. Frequently require re-work to achieve a 100 % seal of the assembly.

Advantages of Loctite® Thread Sealants as compared to traditional sealant types:

• Single-component – clean and easy to apply

• Does not creep, shrink or block systems

• Can be used on any size of pipe fitting

• Replaces all types of tape and hemp/paste sealants

• The seal resists vibration and shock loads

• Grades with several approvals, e.g. Loctite® 55 Sealing Cord: Potable water (KTW) and Gas (DVGW) approvals

• Protect mated threaded areas against corrosion


Gasketing

Why use a Loctite® Gasketing Product?

Gaskets are used to prevent leakage of fluids or gases by forming impervious barriers. For successful gasketing, it is necessary that the seal must remain intact and leak-free over a long period of time. The gasket must be resistant to fluids and/or gasses, and withstand the operating temperatures and pressures to which it is subjected. Loctite® gasketing products are self-forming gaskets that provide a perfect seal between components, with maximum face-to-face contact, eliminating flange face corrosion. A low-pressure seal is formed immediately on assembly, with full cure in 24 hours giving a joint that won’t shrink, crack or relax. Loctite® Gasketing products offer a much higher performance and provide numerous benefits over traditional sealing systems such as pre-cut gaskets:

The major causes of failure and leakage of compression gaskets are:

• Surface contact: Compression gaskets do not provide total contact between the gasket and the flange surfaces. Therefore minor leakages may always occur (weeping rate).

• Compression set: Compression gaskets relax under dynamic loads and decrease in thickness, with subsequent loss of bolt tension in the flange joint resulting in leakage

• Extrusion: Gaskets can be squeezed out between flanges

• Bolt hole distortion: High stresses are transferred to the gasket material under the bolt head, causing the gasket to crack, tear, rupture or extrude.

Advantages of Loctite® Gasketing products as compared to conventional pre-cut compression gaskets:

• Single-component - easy and clean to apply

• Replace conventional gaskets – reduce inventory

• Fills all voids

• No need for retorquing

• Excellent instant seal

• High resistance to solvents

• Resists high pressure when fully cured


Retaining

Why use a Loctite® Retaining Compound?

Loctite® Retaining Compounds secure bearings, bushes and cylindrical parts into housings or

onto shafts. They achieve maximum load transmission capability and uniform stress distribution and eliminate fretting corrosion. Applied as a liquid, they form 100 % contact between mating metal surfaces, eliminating the need for expensive replacement parts, time consuming machining or the use of mechanical methods.

Loctite® Retaining Compounds fill the inner space between components and cure to form a

strong precision assembly. Loctite® Retaining Compounds are much superior to conventional

assembly methods:

• Pins, key/keyway assemblies: Have uneven distribution of mass, an imbalance that can lead to vibration at high speeds

• Splines: They cause high stresses due to the "notch effect" that occurs. High machining costs. Backlash between drive and over rum.

• Clamp rings, press fits, shrink fits, and taper fits: They rely on friction alone to transmit torque, therefore they are limited by material, surfaces and design. Close tolerances are needed to obtain specific load capacities, leading to higher production costs. Interference fitting creates stresses in the components that can lead to failure, particularly when combined with operational stresses.

• Welding and soldering: Only compatible metals can be joined, the parts can be distorted by the high temperatures required. Heating of the material can lead to residual stresses and structural degradation and distortion. Disassembly can also be difficult or impossible.

Advantages of Loctite® Retaining Compounds as compared to conventional assembly methods:

• High-strength products can carry high loads

• Fill all voids to prevent corrosion and fretting

• 100 % contact – load and stress is distributed evenly over the joint

Advantages of Loctite Retaining Compounds in combination with shrink fits or press fits:

• Higher load transmission and performance with existing design and geometry solutions

• Equal performance by lower interference / lighter construction


Structural Bonding

Why use a Henkel Adhesive for Structural Bonding?

The Henkel range of Structural Bonding products offers a wide choice of solutions to meet the different requirements and conditions that apply to industrial design and construction.

Bonding:

Adhesive bonding is a process in which two similar or dissimilar materials are permanently.

Adhesives build ”bridges“ between the surfaces of substrates to be joined.

To achieve the optimal bonding result, the following prerequisites must be met:

• Compatibility of the adhesive with the materials to be bonded

• Compatibility of the adhesive with the specified requirements

• Correct application of the adhesive

Advantages of adhesive bonding compared to conventional joining methods:

More uniform stress distribution over the entire bond face:

This has a very positive effect on the static and dynamic strength achieved. Where welding and riveting result in localised stress peaks, adhesive bonding achieves uniform distribution and absorption of stress loads.

No change in surface and texture of the joined materials:

Welding temperatures may change the texture and therefore the mechanical properties of

materials. In addition, welding, riveting and bolting all affect the visual appearance of the parts.

Weight saving:

Adhesives are particularly popular for light-weight constructions, where thin-walled parts (wall thickness < 0.5 mm) must be joined.

Sealed joints:
 
Adhesives also act as sealants, preventing loss of pressure or liquids, blocking the penetration of condensation water and protecting against corrosion.

Joining dissimilar materials and reducing the risk of corrosion:

The adhesive forms an insulating film to prevent contact corrosion when different types of metals are joined. It also acts as electrical and thermal insulator.


Underfill

Henkel’s portfolio of Underfill materials and products is continually growing, offering next generation systems with impressive designs and mechanical characteristics.

The package-level Underfill systems have been engineered to deliver robust performance. These systems are also able to meet stringent JEDEC testing requirements and ensure Pb-free compatibility. Everything from low Potassium/Copper (K/Cu) die, materials with incredibly long working lives, Snapcure processing alternatives and both fluxing no-flow Underfills and high thermal Underfills are available through Henkel’s line of Underfill products.


Vtech SMT Ltd, Vision House, Throsk, Stirling, Scotland, FK7 7NP
Telephone: +44 (0) 1786 813999 | Fax: +44 (0) 1786 813998 | Email: sales@vtech-smt.co.uk