New Products at TECHSOLUTE

Techsolute has tied up with some global leaders to market their products:

• COX, UK: PC Cox is the world's largest, most progressive and successful manufacturer of hand-held sealant applicators, with a range of over 90 models, manual, battery and pneumatic, for single and dual-component materials, and capable of dispensing cartridges, sachets or bulk material. visit http://www.pccox.co.uk

• GE-Momentive: Momentive Performance Materials Inc, formerly referred to in the construction industry as GE Silicones (or GE Toshiba Silicones in Asia and GE Bayer Silicones in Europe), has been a world leader in silicone sealants and adhesives for more then 40 years. Supplying a broad range of GE brand sealants and adhesives globally for diverse markets and applications.
  

Choosing the right lubricant - Prevent micropitting

All gears are susceptible to micropitting, a condition that can damage gear tooth
accuracy and even cause catastrophic equipment failure if left unchecked.

Micropitting damages gear surfaces beginning at the contact points and spreads
through gear surface cracks. The main crack undermines the surface by growing
deeper and spreading in a fan shape, including external, internal, spur helical and
level gears. Although micropitting is not easy to detect, the selection of the correct lubricant can greatly help mitigate its costly effects.

Here are measures to guard against micropitting:

• Increase oil film thickness – Use the highest practical oil viscosity, run gears at high speeds, cool gear teeth, and use synthetic oils above -80° C.

• Reduce surface roughness – Coat teeth and run-in with special lubricant,
pre-filter lubricant, keep oil cool during run-in, drain lubricant and flush
gearbox after run-in, and change filter frequently.

• Optimize lubricant – Select oil with high micropitting resistance, low traction coefficient, and high pressure viscosity coefficient. Avoid oils with aggressive EP additives, and keep oils cool, dry and clean of solid contaminants

By carefully selecting the correct lubricant, industrial maintenance professionals can reduce incidences of micropitting, increasing efficiency and reducing costs by helping safeguard against equipment failure.

Anaerobic Adhesives - An Update

Commonly used as thread lockers, thread sealants, and retaining or gasketing materials, anaerobic adhesives can help manufacturers and maintenance personnel to decrease total manufacturing or operating costs and enhance equipment reliability. These liquid adhesives cure or solidify when restricted from oxygen in the presence of metal ions. As these adhesives contain no volatile solvents that evaporate out of the threads over time, they will not shrink and affect the long-term performance of the sealed joint.

New Technology
New generation anaerobic adhesives have been formulated to withstand temperatures up to 650ºF without degrading. New high temperature/high strength anaerobics thrive in demanding applications and environments including industrial ovens and boiler rooms, as well as heat treating operations in refineries, paper mills, metal fabrication plants, and glass manufacturing facilities. Despite their high heat resistance, these new thread lockers can be removed with standard hand tools after the fastener is heated to 700-750oF for about five minutes.

All anaerobic adhesives facilitate fastener assembly by providing lubrication as the fastener is tightened. This lubrication allows applied torque to be converted into high clamp load instead of dissipating as friction or heat. On bolts that are 7/8-inch in diameter or larger, friction between the threads plays a great role in reducing potential clamp load. Recently developed high lubricity thread lockers more effectively control friction and reliably convert torque energy into clamp load.

Further, new anaerobic products are available with greatly reduced odor, allowing users to work in close proximity to the liquid with less exposure to chemical fumes.

Vacuum Impregnation for Porosity Sealing of Metal Castings, Powder Metal/Sintered Parts

Impregnating methods used to seal porosity in metal castings, powder metal parts, and electrical components are typically performed by one of four different processes.

Choosing the best process depends on a variety of factors such as:

• Number and Size of Parts to be Impregnated
• Material Used to Produce the Part
• Size and Amount of Porosity Contained in the Parts
• Desired Sealing Results
• Economics

The Four Different Processes Available Include:

• Dry Vacuum and Pressure
• Wet Vacuum and Pressure
• Wet Vacuum
• Internal Impregnation or Pressure Method

Note: Although the impregnation process typically includes a Wash Step to remove excess sealant from the part and a Cure Step to polymerize the remaining sealant in the porosity, the Actual Impregnation Process is the Act of Filling Porosity with the Sealant.

Since "Dry Vacuum & Pressure" and "Wet Vacuum & Pressure" processes require very high investment and yet may not provide very high quality results, the other two processes are being discussed further.

Wet Vacuum Impregnation

This method requires a relatively low investment in equipment, and cycle times are quicker. The Wet Vacuum method performs best for parts with large evenly distributed porosity such powdered/sintered metal.

The Wet Vacuum method requires only a single vessel that can maintain a vacuum, thus does not require a pressure rated vessel. As in the Wet Vacuum method above, the sealant is stored in the vessel. The part/s are immersed in the sealant in the vessel and a vacuum is applied. The level of vacuum is generally between 28 to 29 inches of Hg. This removes air from the vessel, sealant and from within the porosity of the part/s. (The vacuum is applied for a sufficient amount of time to ensure adequate de-aeration). When complete, the residual vacuum is released to atmosphere. Part/s are left to soak in the sealant at atmospheric pressure for a period of time to long enough facilitate penetration into the porosity. After sufficient soak time, the part/s are removed.

Internal Impregnation or Pressure Impregnation

This method requires the least investment in equipment and provides excellent sealing results in even the finest porosity, but limits the number of parts that can be processed at any one time.

The Internal Impregnation or Pressure Impregnation method utilizes the part as the vessel. This method although quite effective, allows only one part to be processed at a time. (Naturally, a requirement to process hundreds or even thousand of parts makes this method economically impractical). To internally impregnate a part, the part is first filled with sealant while venting any trapped air. The sealant within the part is then pressurized up to the test pressure of the part. Pressures of anywhere between 5 psi to 3000 psi are not uncommon. The pressure is typically held until sealant is seen weeping from the part. When this is achieved, the pressure is reduced to atmosphere and the sealant is drained from the part.

STRUCTURAL ADHESIVES CHALLENGE MECHANICAL FASTENERS

Adhesives are becoming a formidable competitor to mechanical fasteners in structural applications. The reason: recent improvements in peel strength, flexibility, and resistance to moisture, temperature, and chemicals.

The potential advantages of adhesives over mechanical fasteners have long been recognized; however, industrial acceptance of adhesives for structural applications has been slow. The main reason for this lack of use is that adequate information about the characteristics of adhesives was not available until recently. Development studies by the aerospace industry greatly improved the technical database on structural adhesives, and many industrial designers are now convinced that the adhesives can provide bonds that are both cost effective and durable.
Structural adhesive bonds have replaced both mechanical fasteners and assembly techniques such as soldering and welding in many industrial applications. The advantages of structural adhesive bonding over other joining techniques include:

• Cost savings, including lower labor costs.
• Weight reduction.
• Elimination of stress point concentrations by even distribution of stress over the entire bonded surface, plus improved load bearing capacity.
• Protective sealing against contamination by liquids or gases.
• Bonding of dissimilar materials. Often the adhesive bond line acts as an insulator against galvanic corrosion in metal assemblies.
• Improved fatigue resistance, and resistance to shock, vibration, and thermal cycling.
• Enhanced structural appearance because protrusions, punctures, and attachments are eliminated.
• Increased tolerances on machined parts because some structural adhesives can fill gaps left when parts mate poorly.

Few available adhesive materials meet the stringent requirements of structural bonding, such as durability, high strength, and dimensional stability over a wide range of environmental conditions. The main classes of adhesives meeting structural requirements are epoxies, cyanoacrylates, reactive acrylics, and polyurethanes. Also, recently developed materials that appear to be especially suited to high temperature use include polyimides and some silicones.

Why do we NEED Anaerobic Adhesives?

Anaerobic adhesives are single part and have two basic requirements to cure.

1) Presence of 2 metal parts.
2) Absence of air – unlike many other adhesives which cure in the presence of air.

There are many types of anaerobic adhesives for a variety of applications; a few major ones are explained below:

Threadlockers are SUPERIOR to conventional lock washers, nylon inserts, and other mechanical devices because they SECURE the entire fastener assembly against loosening from shock and vibration so fastener clamping forces are maintained. Threadlockers also SEAL the threads against leakage and PREVENT rust and corrosion.

Available in a variety of strengths and temperature ratings, Threadlockers remain the most reliable way to lock and seal threaded fasteners of all shapes and sizes, either before or after assembly.

Retaining Compounds are designed to BOND non-threaded, cylindrical metal assemblies by filling the voids between close-fitting metal parts, Retaining Compounds HARDEN to create a solid, one-piece assembly. Retaining Compounds can be used to lock keyways, SECURE splines, augment press fits, and strengthen interference fits. Use them to prevent wear on new components, or RESTORE the fit to worn or out-of-tolerance parts. Retaining Compounds SEAL joints against leakage and PREVENT fretting and corrosion.

Formulated in a variety of viscosities, strength characteristics, gap-filling abilities, and temperature ratings, Retaining Compounds can solve even the most difficult retaining applications.

Thread Sealants seal and SECURE metal pipes and fittings. By filling the space BETWEEN threaded metal parts, Thread Sealants PREVENT leakage caused by vibration loosening, tape shredding, solvent evaporation, damaged threads, and temperature cycling. Designed for low and high-pressure applications, Thread Sealants SEAL instantly for on-line low pressure testing.

When fully cured, they seal to the burst strength of most piping systems. The high lubricating properties of Thread Sealants EASE assembly and prevent galling of the threads. For system repairs, parts may be disassembled with basic hand tools.

Gaskets are used to prevent fluid or gas leaks by forming impervious barriers. For successful gasketing, the seal must remain intact and leak-free over a prolonged period of time. Therefore, the gasket must resist the fluid and/or gaseous medium being sealed or excluded, and withstand the operating temperatures and pressures to which it is subjected.

For more information, please feel free to contact us:

TECHSOLUTE Chemicals (India) Pvt. Ltd.

678, IA, Phase-II, Chandigarh – 160 002

Tel: 0172.2654548, 2652499 Email: info@techsolute.com www.techsolute.com

Techsolute Chemicals India Pvt. Ltd. (formerly Techno-Commercial Linkers) is a more than 15 year old enterprise managed by technocrats with expertise in the field of specialty industrial chemicals.