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Adhesive.org Article Details How Adhesives Overcome Disadvantages of Mechanical and Thermal Fastening

Posted By ASC, Wednesday, July 12, 2017

Before modern adhesive technologists came up with advanced adhesives, engineers chose one of two methods: mechanical or thermal fastening. Today’s market demands, advanced materials and complex manufacturing requirements demand much more from manufacturers however.


The adhesive industry has responded with innovative and highly effective methods to meet these increasing demands and complexities, while addressing some of the inadequacies of traditional fastening methods.


Let’s look at some of the disadvantages of mechanical fasteners:

  • They add weight
  • They usually require holes that weaken components
  • They leave very visible bond lines
  • They carry all load at specific points, contributing to fatigue
  • They do not separate dissimilar materials and that can cause corrosion
  • Thermal fastening offers an alternative, but also has its disadvantages:
  • The substrates must be thick enough
  • They’re hard to disassemble, rework or repair
  • The aesthetics aren’t perfect
  • They require skilled labor and can pose a hazard to workers

 

Combining adhesives and tapes with mechanical and thermal fastening methods or utilizing adhesives alone gives engineers a smorgasbord of options for attaching materials to one another while overcoming difficulties and adding key benefits:

  • Adhesives and tapes allow for faster assembly
  • They can be stronger than welds
  • They are more flexible
  • They bond and seal at the same time
  • More...


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Adhesives.org BLOG: “As Received” and Adhesive Performance

Posted By ASC, Monday, July 10, 2017

BLOG:  “As Received” and Adhesive Performance
 
By Jim Swope, Adhesives.org Expert Blogger (The ChemQuest Group, Inc.)

In my early days as a supplier of adhesives to automotive assembly operations, I dreaded the words “as received” on a specification because its implied meaning could affect adhesive performance (light mill oil commonly used as a rust preventative by parts suppliers is often the culprit).


Mill oils may not present major problems in assemblies where the adhesive process is augmented by mechanical methods such as spot welds or the adhesive process displaces the oil. However, when the adhesive is carrying the full load (no mechanical augmentation) or the operating conditions are extreme, surface contamination will present issues. A clean surface is commonly understood as being critical to repeated success in bonding. Sometimes the parts supplier would insist their parts are cleaned prior to shipping but further probing would reveal they added a rust preventative in the final rinse or as a subsequent process. The presence of a rust preventative can retard or arrest chemical cures or act as a barrier to proper wetting of the surface.The outcome of which is classic weak link theory: The assembly fails due to weakening of a critical component – the adhesive interface to the substrate.


What steps can be taken to assure that we avoid failure in critical assemblies? How do we balance that against cost pressures? Who bears the cost burden of proper surface preparation?


The answer lies with the specification writer who ought to own not only the bonding specification but the condition of the substrates that are critical to the assembly... Read More

 

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Berry Global Buys Specialty Tape Maker Adchem

Posted By ASC, Friday, July 7, 2017
Updated: Thursday, July 6, 2017
Berry Global Group Inc. is expanding its specialty tapes business with the acquisition of Adchem Corp.

Evansville, Ind.-based Berry Global calls Adchem a leader in the development of high performance adhesive tape systems.

Adchem has about 110 employees at its sole manufacturing site in Riverhead, N.Y., a location the company has used since moving from Westbury, N.Y., nearly 20 years ago.

"The combination of Berry and Adchem will enhance our ability to service the needs of our specialty tape customers through expanded technologies, product line extensions and access to new channels to market," Berry said in a statement.

Adchem becomes part of the Engineered Materials division at Berry through the deal that closed June 30...Read More

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Henkel and Fiat Chrysler Partner in Lightweighting, Improved Process, and Performance Drive

Posted By ASC, Thursday, July 6, 2017

Henkel and Fiat Chrysler have been working together during the last three years, arriving at new treatment processes that will be used for the first time in the new Alfa Romeo Giulia. The adhesives resulting from this collaboration will advance the trend towards lightweighting using new materials and mixed materials such as a combination of aluminium and steel.

 

Apart from reducing weight, the materials will allow for body and pain shop improvements in noise reduction and stronger structures. The new Giulia’s body is 90kg lighter than it would have been without Henkel’s input, and both weight and performance have benefitted from the partnership. 

Much of the lightweighting comes through the use of aluminium, and to improve corrosion performance, the Bonderite pre-treatment process developed with Henkel has proved to be the solution. Acoustic performance improvements are realized through the use of Henkel’s Teroson expansion pillar fillers. These consist of a foamable elastomer that is inserted into the body. When exposed to the heat of the e-coat oven, they expand, filling the internal gaps that would otherwise transmit noise.

 

In addition, Fiat Chrysler will be replacing bitumen pads used for noise dampening with a spray-on acrylic waterborne sound deadener. Not only is it lighter, it also deadens the noise of vibration better. The product will also save Fiat Chrysler money since it can be applied in a fully automated process.

 

Further opportunities for automation are presented by the Teroson PV3414 sealant for internal and external seams. Once again, the product not only allows for labour savings, but presents an improvement on the products previously used in terms of the finished product according to the company.

 

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PPG's Chrome-Free Aerospace Sealant Meets Military Specifications

Posted By ASC, Wednesday, July 5, 2017

At this year’s Paris Air Show, PPG announced that its new chrome-free sealants had been given full approval for use in military aircraft. Apart from presenting a more environmentally sustainable option than older forms of such sealants, additional advantages accrue. The Nato NSN approval awarded to the sealants means that the new materials can be adopted without any need for further purchasing approval.


PPG has two chrome-free sealant products with differing uses. The first of these, PR-1425CF, is a polysulfide windshield and canopy sealant. It can be used on polycarbonate, glass or acrylic windows and will cure in in half the time needed for older iterations of the product.PPG’s PR-2870 sealant, on the other hand, is used for aerodynamic smoothing. It can also be used to seal structural surfaces, be used for fay sealing, or to seal pressure fuselage. Both sealants will cure within 12 hours.

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Diagnostic Adhesive Patch for Sleep Apnea Shows Promise

Posted By ASC, Monday, July 3, 2017

Doctors currently use cumbersome equipment to diagnose sleep apnea. Unfortunately, many patients struggled to sleep at all during polysomnography tests. Now, clinical trials on an adhesive patch that weighs less than an ounce have shown that it can produce accurate diagnoses. The information it gave to researchers was 87.4 percent as accurate as that produced by standard polysomnography.

 

The new SomnaPatch measures blood oxygen, nasal pressure, pulse rate, body position, sleep time and respiratory effort. Patients will be able to apply the patch at home, collecting up to four hours of sleep data.The study authors say that the device is a low-cost solution that will allow for sleep apnea diagnosis without disrupting sleep. It is yet to be approved by the FDA, but researchers say that their study will provide the information the organization needs to evaluate the new device during the approval process. Somnarus Inc, the company behind the innovation, has presented its results to sleep medicine specialists, and the abstract of its study was published in the journal Sleep.

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YINCAE Advanced Materials Releases New Solder Joint Encapsulant Adhesive Paste for Microelectronics to Replace Solder Paste and Flux

Posted By ASC, Thursday, June 29, 2017

YINCAE, manufacturers of coatings, adhesives, and materials used in microchips and optoelectronics, has announced its release of a new solder joint encapsulant paste, SMT 256EP. The company says that the adhesive replaces traditional underfill, solder paste and flux while resulting in joints that are five to ten times stronger than those it was previously possible to achieve. The stronger joints retain their integrity at temperatures of up to 280°C with a pull strength of 180g at this high temperature.

 

By eliminating the need for red glue during double reflow, the solder paste will reduce manufacturing costs, and it can be used in both dispensing and printing scenarios. Specifically designed for mass production, the product has excellent thermocycling properties and can be reflowed at 230°C. YINCAE believes that its innovation will be widely adopted within the microelectronics industry thanks to the cost savings it enables.

 

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Sika Corp Releases New Mirror Grip Adhesive for Vertical Mirror Installation

Posted By ASC, Wednesday, June 28, 2017

Sika Corporation has added a new product to its Flat Glass product range. The adhesive has been designed specifically for bonding mirrors to vertical surfaces and is effective across a wide range of interior substrates. The company says that its new product allows for instant grip and reduces the amount of material needed to fix mirrors to surfaces. Vertical beads can be spaced eight inches apart, whereas older products required a five-inch spacing between beads.

 

Sikaflex®-124 Mirror Grip will not cause any discoloration or staining of the mirror, is low in solvents and adheres well to Category II safety film. Although the company says that its product grips instantly, it nevertheless recommends using mechanical support during and after installation to ensure absolute safety. However, it notes that Sikaflex®-124 Mirror Grip will eliminate the need to use several products for different types of mirror installations.

 

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Platte River Equity Makes Investment in MFG Chemical, Inc.

Posted By ASC, Tuesday, June 27, 2017

Grace Matthews, Inc. and MFG Chemical, Inc. ("MFG Chemical") announced today that Platte River Equity III, L.P. ("Platte River Equity") has completed a recapitalization of MFG Chemical. The company will continue to be led by the current President and COO, Keith Arnold. Grace Matthews, a Milwaukee-based investment bank, advised MFG Chemical on the recapitalization.

Based in Dalton, Georgia, MFG Chemical is a leading surfactants, polymers and specialty chemicals manufacturer. The company offers a diverse range of technical formulation capabilities on both a proprietary and contract manufacturing basis. Its strong formulation expertise has enabled the company to pursue a range of applications, notably in the oilfield and water treatment sectors. MFG Chemical is best known in the industry for the manufacture of sodium dioctyl sulfosuccinates ("DOSS"), a class of highly efficient and versatile surfactants.

The shareholders of MFG Chemical are members of the Gavin family, led by Charles E. Gavin, III, the founder and CEO of MFG Chemical. The Gavin family will maintain a significant ownership position in the company going forward. The shareholders...Read More

 

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Adhesives.org BLOG: What makes Firestop different from other sealants?

Posted By ASC, Monday, June 26, 2017
Updated: Monday, June 26, 2017

BLOG:  What makes Firestop different from other sealants?
 
By Sharron Halpert, Adhesives.org Expert Blogger

 

There is one important element in firestop materials that makes them different from so many other sealants is the way they behave in a fire. Of course the “secret sauce” that goes into the product that makes them more expensive than other sealants also. The key element in many, but not all, firestop products is their capacity to expand when the product is exposed to the heat seen in a fire scenario. The industry lingo is intumescent. When looking at the sealants used in firestop they are either used in joint applications so they need to allow for movement, or they are used in through penetrations in which case many applications will require an intumescent product. Today we will discuss why this more expensive material can not be substituted for the non-intumescent material.


First of all, this intumescent material is needed when dealing with combustible through penetration such as insulation around pipes or ducts. As the fire causes the insulation to melt or soften, the expanding intumescent firestop will close the gap that is created. It’s even more obvious that intumescent material would be needed around plastic pipes. Plastic pipes will melt at temperatures around 300F-500F degrees, depending on their chemical composition. For many pipes under 2” diameter an installer can use an intumescent sealant. “Many” is a tricky word. It alludes to the potential for exceptions, and in this case the exception is FRPP, plastic fire sprinkler pipes. Most manufacturers will not be able to firestop 2” diameter FRPP with just sealant.


Some firestop materials are not even compatible with FRPP because over time the chemical incompatibility will etch holes in the plastic pipe. It is recommended that installers check the...

 

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