Extreme weather and temperature resistant Silastomer 337

Extreme weather and temperature resistant Silastomer 337 is a high performance, single component, ready to use clear adhesive sealant. Silastomer 337 cures to a tough, resilient and durable silicone rubber once exposed to moisture in the air.  The neutral curing system of this extreme weather and temperature adhesive is designed to be used around sensitive electronics and electrical materials such as brass, copper and silver.  Silastomer 337 will adhere to clean metals, glass, rubber, ceramic, many plastics and vinyl.  UL approval for horizontal burn and mechanical adhesion.

Silastomer 337 is ready to use, does not require mixing or additives.  Moisture curing begins immediately after the product is exposed to air, therefore assemble parts within just a few minutes after the product is dispensed.  This extreme weather and temperature resistant silastomer 337 starts to skin over in approximately 10 minutes, reaching full cure in 24 hours and a maximum adhesion in 7 days.

Extreme weather and temperature resistant Silastomer 337

 

Hernon Silastomer 337 provides excellent resistance to moisture, weathering, vibration, ozone and extreme temperatures.  It can be applied in surface temperatures of -18°C to +49°C (0°F to +120°F) with no loss in performance.  Fully cured Silastomer 337 can withstand extended periods at temperatures up to 205°C (400°F).

 

Product Benefits

  • One component – no mixing
  • Room temperature cure
  • Sealing lead wire entries
  • Circuit board protection
  • Excellent high and low temperature resistance
  • VOC compliant – low outgassing
  • Excellent choice for use around sensitive electronics and sensors – non corrosive to most substrates
  • Waterproofing electronics
  • Engine components
  • Versatile electrical insulation
  • Cured rubber is non-toxic
  • Silastomer 337 exhibits excellent performance where a long term, permanently flexible bond is required

Approvals

Extreme weather and temperature resistant Silastomer 337, when fully cured, meets requirements for Mil Spec MIL-A-46106B Type I.  FDA compliant with regulation title CFR 175.105 where incidental food contact may be involved.


Copper anti-seize 367

Copper anti-seize 367 is a low-friction, anti-seize lubricant manufactured from a combination of micro-size copper flakes and graphite dispersed in a water-resistant grease and fortified with antioxidants, plus rust and corrosion inhibitors.

Hernon Copper anti-seize fills irregularities and imperfections and resists welding, hardening, and setting. It provides low-friction and cushions impact and shock loads. Low shear between particles reduces stick-slip, allowing quick disassembly with minimum wrench torque. It will not squeeze out of the threads, gum up, or wash off.

Provide a shield against metal-to-metal contact and prevent seizure and corrosion with Copper antiseize Lubricant 367

Copper Based Anti-Seize 367 provides a shield against metal-to-metal contact, preventing seizure and corrosion. It fills irregularities and imperfections and resists welding, hardening, or setting. provides low friction and cushions impact and shock loads. Low shear between particles reduces stick-slip, allowing quick disassembly with minimum wrench torque. It will not squeeze out of the threads, gum up, or wash off.

Product benefits Copper anti-seize 367

Copper Antisieze

  • Conforms to MIL-PRF-907E
  • Service rating: -65°F (-54°C) to 1800°F (982°C)
  • Contains no lead or zinc
  • Lowers friction; reduces wrench torque
  • Permits reuse of fittings; saves stud, bolt, and nut replacement
  • Aluminum complex base for brushability and stability over a wide temperature range
  • Not affected by contraction, expansion, or vibration

Central Tapes & Adhesives Ltd are the UK & European Technical Specialists and Distributors for Hernon Manufacturing Inc.

For more information and prices contact us

 


Non flammable activator 75

Hernon® EF Accelerator is a low toxicity, non flammable, non combustible, non ozone depleting, low volatile organic compound (VOC).  It is an accelerator, which improves instant adhesive fixture and curing performance.  Non flammable activator 75 is Eco friendly.  Through careful, meticulous Research and Development, our expert team of engineers, programmers, chemists and chemical engineers eliminate hazardous and explosive solvent adhesives to reduce our impact on the earth and increase the safety of our products.

 

Typical Applications

EF Accelerator 75 is used to provide curing on inactive surfaces, speed the cure on active surfaces and increase the curing speed between bonding surfaces.  Also good for Hernon’s Instantbond and Quantum products

Non flammable activator 75

Directions for use

Apply adhesive to one of the surfaces to be bonded and assemble parts.   Apply Accelerator 75 over all exposed adhesive by spray or by drop. (Use one drop of activator per one drop of exposed adhesive) Surface Activation.  Apply one coating of Accelerator to the area to be bonded by spray, brush or dipping. Contaminated surfaces may need special cleaning or degreasing prior to activation to remove any soluble contamination.  Allow the solvent time to evaporate until the surfaces are completely dry (approx. 30- seconds).  Apply the Cyanoacrylate product immediately after drying or not more than 45 seconds thereafter.  Activator can be re-applied if necessary if there is a delay of more than 45 seconds between original activator and adhesive application.

Central Tapes & Adhesives Ltd are the UK & European Technical Specialists for Hernon Manufacturing Inc.  Contact us for more information, quotation and technical information.


Problem Solving

Problem Solving  this category has been designed to share our knowledge on all aspects of bonding to assist you with your projects and understanding of adhesive selection, Joint design, Loads and stresses on bonded joints.

At Central Tapes & Adhesives Ltd, we are always on hand to discuss your application, visit your premises and provide a demonstration and perform product trials on your behalf. We have the technical knowledge and experience in most industries, we keep up to date with competitor products available in the market place and go above an beyond to remain innovative in providing the best solutions in all your bonding needs.

Please use the following links to help with your adhesive selection:

Types of adhesives and adhesive terminology

Adhesive joint design

Adhesive stress loads

Calculate adhesive quantities

Conversion chart

• Surface preparation for adhesives and best working practice


Stress loads on adhesive joints

Stress loads on adhesive joints can vary from application depending on the substrates being bonded and how pressure/force is loaded upon a joint. It is difficult to determine how differing stress loads on adhesive joints may affect the overall performance and durability of a bonded joint within an application.   Various tests can be performed to ascertain each adhesives optimum performance and also what performance can be achieved when differing stresses are applied to a bonded joint.  Stress is a force applied to a bond, usually expressed in N/mm² (Newton’s per square millimetre) or MPa (Mega Pascals).

Below you will see a variety of diagrams with an explanation about the stresses commonly found in adhesive bonds.  One type of stress is Impact stress which occurs when a sudden force or shock is applied to a joint.  for more information on joints view adhesive joint design. 

Tensile Stress

Tensile stress:   to pull an object apart.  It also tends to elongate an object.

 

 

Compressive stress:  the opposite of tensile stress, compressive stress tends to squeeze an object together.Compressive Stress

 

 

Shear stress:  created by two surfaces sliding over one another.

Shear Stress

 

 

 

Cleavage stress:  occurs when a joint is being opened at one end.Cleavage Stress

 

 

 

 

Peel stress:  occurs when a flexible substrate is being lifted or peeled from the other substrate.

Peel Stress

 

 

 

 

To speak with out technical team on any of the above contact us.

 

 

 

 

 


Adhesive joint design

Adhesive joint design can vary tremendously dependent upon materials, dimensions and various limitations.  This section has been put together to help determine and understand the numerous ways of bonding joints together and how this can benefit in strength and performance or adversely be detrimental to the overall performance and durability of the adhesive joint.

Their are many different attributes that need to be considered when metal bonding, these factors are types of joints, types of stresses and distribution of stress across the joint.

Types of joints

Please view the images on this page to assist in understanding popular joints.  These images are cross sections of joints, grey signifies your chosen metal and blue signifies adhesive.

Double Lap Joint

Double lap joint:   Incorporates two lap shear joints in one.

Butt joint:   Formed by bonding two objects end to end.

Butt Joint

 

Joggle lap joint:   Offset joint very similar to the lap joint.

Joggle Lap Joint

 

Lap/Overlap joint:   Formed by placing one substrate partially over another substrate. Lap Overlap Joint

Scarf joint:   An angular butt joint.  Cutting the joint at an angle increases the surface area.Scarf Joint

Cylindrical joint:   Uses a butt joint, to join two cylindrical objects.Cylindrical Joint

 

Single or Double strap joint:   A combination overlap joint with a butt joint.

Strap Joint

Double Strap Joint

Buiscuit Lid Joint

 

Biscuit Lid Joint:  a variation on a joggle lap joint

 

Flange Joint

 

Flange Joint:  A variation on an overlap joint

 

 

 

Toggle joint:  Formed by fitting the two substrates together in a ‘tongue and groove’ type formation

Toggle Joint

 

 

Stepped lap joint:  a variation of a lap shear jointStepped Lap Joint

 

If you would like to discuss adhesive joint design further, please contact our technical team.

 

 

 

 

 

 

 


Structural Adhesives

Structural or performance adhesives are load-bearing adhesives.  That is they add strength to the products being bonded.  Structural Adhesives are used to build products as varied as office furniture, boats, trains, cars to name a few.  There are approximately ten adhesive families commonly referred to as structural adhesives: Methacrylate, Acrylic, Polyurethane, Epoxy, Anaerobic, Cyanoacrylate, Hot Melt, Solvent cement and Tapes.

The seven most commonly used are:

Acrylic adhesives have formulations that tolerate dirtier and less prepared surfaces generally associated with metals.  they challenge epoxies in shear strength, and offer flexible bonds with good peel and impact resistance.  Acrylics are two-part adhesives, the resin is applied to one surface and an accelerator or primer to the other.  The two parts can be pre-applied and later mated.  Once mated, handling strength is typically achieved in a few minutes.  Curing can be completed at room temperature.  Newer versions of acrylics are now available in two component formulations then are mixed together prior to application.  To discuss our acrylic adhesives please contact our technical team.

Methacrylate Adhesives provide a unique balance of high tensile, shear and peel strengths with the maximum resistance to shock, stress and impact across a wide temperature range.  Methacrylates can generally by used without surface preparation when joining plastics, metals and composites.  They are two component reactive materials based on methyl methacrylate monomer that, when mixed together, have a controlled cure speed based on the appropriate application process.  Methacrylates are tolerant to off ratio mixing and remain strong and durable under severe environmental conditions.  They resist water and solvents to form an impenetrable bond.  For CTA product information view following links: –

Advantages – Moderately priced, good gap fill, excellent impact resistance and flexibility, excellent peel and sheer strengths, substrate versatility, medium/fast cure, tolerant of dirty surfaces, good flexibility at low temperatures.

Limitations – Some odour problems, flammable.

Polyurethane Adhesives are named after the polymer type formed on completion of the reaction.  the adhesives can be single or two component. With two component products one side is always isocyanate based, the other formulated from one of several core reactants often amines or glycols.  They are known for toughness and flexibility even at low temperatures.  They have fairly good shear strength and excellent water and humidity resistance, although uncured urethane’s are sensitive to moisture and temperature. For product information view following links: –

Epoxy adhesives have been available longer than any engineering adhesive and are the most widely used structural adhesive. Epoxy adhesives are thermo-setting resins which solidify by polymerisation and once set, will soften but not melt on heating.  Two part resin/hardener systems will solidify on mixing (sometimes accelerated by heat), while one part materials require heat to initiate the reaction of a latent catalyst.  Epoxies offer very high shear strengths, and can be modified to meet a variety of bonding needs. Generally epoxy bonds are rigid: they fill small gaps well with little shrinkage.  For CTA product information view following links: –

 Advantages – Usually low priced, good gap filling capabilities, high strength can be filled with metals, wide range of formulations, versatile, good temperature and solvent resistance.

Limitations – Adhesives thin during curing cycles, two component mixing and measuring required, exact proportions needed for optimal strength, single component usually required refrigeration and heat cure.

Anaerobic adhesives are one of the most easily applied structural adhesives.  Due to the curing mechanism being triggered by deprivation of oxygen (hence the name ‘anaerobic’ or ‘without air’), anaerobic adhesives will not cure prematurely.  these adhesives are based on acrylic polyester resins and are produced in viscosities ranging from thin liquids to viscous thixotropic pastes.  Although they have high cohesive strength, they have low adhesive strength and are not suited to permeable materials. Anaerobics do not fill gaps well and may require primers.  they are generally used as thread fasteners.  For CTA product information view following links: –

Advantages – Moderately priced, high strength on some substrates, rapid cure at room temperature, good solvent and temperature resistance, versatile, range of viscosities, non toxic, no mixing required, dispenses easily from package, easily automated.

Limitations – Limited gap cure, not recommended for many plastic or rubber substrates, will not cure where air contacts adhesive – wet fillets, primers required for many materials, 150-200°C temperature limitations, generally brittle.

Cyanoacrylate adhesives (super glues) are also easily applied and offer extremely fast cure rates. Cyanoacrylates are relatively low viscosity fluids based on acrylic monomers and when placed between closely fitting surfaces, some will cure to a strong joint in ten to sixty seconds.  Cyanoacrylates’ ability to bond plastics and rubbers to themselves or to other substrates is their biggest advantage.  On the other hand, cyanoacrylate adhesives exhibit poor impact resistance, are vulnerable to moisture and solvents, and are suitable only for bonding small areas. In addition, they do not fill gaps well, require precise mating of bonded surfaces. They also have poor solvent and water resistance.  For CTA product information view following links: –

Advantages – Rapid cure at room temperature, single component adhesive, excellent adhesion to rubber, good adhesion to metal, high tensile strength, no mixing required, indefinite pot life, dispense easily from package.

Limitations – Limited gap cure, low solvent resistance, low temperature resistance, bonds skin, poor impact and peel resistance, no water chemical or environmental resistance.

Hot Melt Adhesives have moved out of their traditional applications into areas of low-stress product assemblies.  They form flexible and rigid bonds, achieve 80% of their bond strength within seconds, bond permeable and impermeable materials, and usually require no elaborate surface preparation.  Hot Melts are insensitive to moisture and many solvents, but they soften at high temperatures.  To discuss our hot melt adhesive please contact our technical team.

Advantages – Moderately priced, good gap-filling capabilities, rigid to flexible bonds available, versatile formulations, fast setting.

Limitations – Usually low strength, poor wetting, poor creep resistance, usually low solvent resistance, low heat resistance – degrade as heat rises, stringy, parts must be mated before adhesive cools, short part life, messy can burn workers, requires special dispensing equipment, difficult to automate.


Die Cutting

Die Cuts.

Die Cutting is a process of using a die to shear webs of low strength materials such as pressure sensitive adhesive tapes or foam.  Die Cutting can be specifically made to suit your production process.   Having a tape die cut to suit your application requirements can vastly speed up your production process and assembly time.  In addition to the aesthetics, your component can be improved.

Most of our products can be re engineered from an original roll to a die cut tape.  This is applicable for our double and single sided tape range and even our re-closable fastener range.Die cut tape on a roll.

The adjacent and below images show our Clear foamed acrylic tape 6110c being processed into a customers required dimensions and shape, presented on an over sized liner enabling easy removal from the liner and onto a component.

Die cut tape.

 

 

 

Die Cutting application

Our products can apply to any industry.  This process could be used within the Industrial sector by Sign companies for letters to the automotive industry for badges and trim. For more information on Die Cutting tape please contact our technical team.


Double sided tape

Double sided tape can be categorised into many different types, depending on the carrier and adhesive system used.  The most common carriers are Foam, Polyester, Polypropylene and Tissue.  When coated either side with either an Emulsion or solvent Acrylic, Rubber or Hot Melt adhesive a double sided tape is produced.

Our range can be divided into two main sub categories of thin or thick double sided tape.

Double-sided-tape1Our tape can be used in many different ways.  If you are looking for a thin bond line or a general purpose product then please have a look at our thin double sided tape.  If however you require a product to to cope with uneven surfaces or need to fill a gap then please view our thick double sided tape.

When a structural strength or high temperature is require you may wish to look at our Structural Acrylic Tapes.

Double sided tape application

We recommend you use CTA IPA cleaner/degreaser to ensure surfaces are clean and free from dirt or dust to ensure a clean bond line.

Contact us to speak with our technical team of experts.