Adhesives, Sealants and Coatings for a Variety of Industries

An adhesive utilized for hermetically sealing batteries must fulfill several criteria, including resistance to chemicals, temperature, pressure, and electricity. It should exhibit minimal outgassing, low moisture permeability, high adhesion to packaging materials, and suitable modulus and thermal expansion properties. This adhesive must not contaminate the battery's electrolyte, either during curing or through chemical degradation over the battery's lifespan. The adhesive's rheological properties, such as wetting and adhesion, are crucial for ensuring a continuous, impermeable seal. Additionally, the adhesive must maintain its integrity over a wide temperature range, necessitating strong adhesion to the battery casing, defect-free application, and a coefficient of thermal expansion compatible with temperature variations during battery operation. Learn more about the requirements, applications and challenges involving the adhesive specifications for the hermetic sealing of microbatteries in this white paper.

Travel with Maximus Bond as he goes back in time to review the progress of the transportation industry from the past to today. From trains to cars to planes, Max takes you on an exciting journey showing how Master Bond's advanced adhesive systems can help this ever evolving industry move forward!

Master Bond EP70CN is a two part, thermally stable epoxy adhesive formulated using a natural, renewable and sustainable ingredient. This epoxy system forms high physical strength bonds and can be utilized for bonding, sealing, coating and potting. “The tensile strength is 11,000 to 12,000 psi and the tensile modulus, 300,000 to 350,000 psi. It features a glass transition temperature of 130 to 135°C”, says Rohit Ramnath, Senior Product Engineer. “The EP70CN has a very good chemical resistance profile when cured at the optimal cure schedule.” It is a low viscosity formulation with a mixed viscosity of 2,500 to 5,000 cps. With a long working life of 60 to 90 minutes and a variety of curing options, the optimal cure schedule is overnight at room temperature followed by 3-4 hours at 140°F to 170°F. EP70CN bonds well to a wide variety of substrates including metals, ceramics and many rubbers, plastic materials, and especially composites with low shrinkage upon cure. It features excellent wetting properties which makes it suitable for applications involving bonding and sealing fibers. EP70CN has a high volume resistivity (greater than 1014 ohm-cm) and a relatively low exotherm. This combination of properties enables it to be used in many encapsulating applications. EP70CN can be used in aerospace, electronic, opto-electronic and OEM applications, particularly those involving composites and fibers. In addition to specialty packaging in the form of premixed & frozen syringes and FlexiPaks®, EP70CN is available in standard packaging of ½ pint, pint, quart and gallon kits.

The combination of increasingly complex assemblies and exacting quality requirements is compelling design engineers to be extremely diligent when selecting materials for the assembly of medical electronic devices. In this white paper, we explore various polymer chemistries and what the different families of compounds have to offer for performance and processing requirements.

Since its introduction in 1978, Master Bond EP29LPSP has been the epoxy compound of choice in a variety of challenging applications. Ideal for demanding cryogenic environments, two-part EP29LPSP can withstand temperatures as low as 4K and can resist cryogenic shock when, for instance, it is cooled from room temperature to cryogenic temperatures within a 5-10 minute window. Optically clear EP29LPSP has superior physical strength, electrical insulation, and chemical resistance properties. It also meets NASA low outgassing requirements and exhibits a low exotherm during cure. This low viscosity compound is easy to apply and bonds well to metals, glass, ceramics, and many different plastics. Curable at room temperature, EP29LPSP attains its best results when cured at 130-165°F for 6-8 hours. In over a dozen published research articles, patents, and manufacturers’ specifications, scientists and engineers have identified EP29LPSP for use in their applications due to its unparalleled performance in one or more areas. Table 1 highlights several commercial and research applications that use Master Bond EP29LPSP. Table 2 summarizes several patents that reference EP29LPSP. Following each table are brief descriptions of the role Master Bond EP29LPSP plays in each application or invention.Table 1: Commercial and Research Uses of EP29LPSPIndustryApplicationEP29LPSP UseCritical PropertiesPlasma PhysicsExperimental device to study magnetic reconnection events1Fabrication of flux core assembliesCryogenic Low outgassingAstronomyInfrared telescope system2Optical fiber mounting assemblyCryogenic Low outgassing Long cure time Low shrinkageAeronauticsTesting of a miniature ramjet model in a supersonic wind tunnel4Bonding strain gauges to flexure beamsSufficient flexibility at cryogenic temperaturesParticle PhysicsArgon detector5Coat metal rim to electrically insulate itCryogenic Low outgassingElectrical insulationParticle PhysicsRadioactive decay detector6Bond flexible cable to flangeLow outgassingNeuroscienceNeurophysiological mechanism of magnetic stimulus in primates11Mechanism to impregnate mini coil during winding processLow viscosity impregnationSpacecraftAttach MLI blanket to spacecraft to survive acceleration, acoustic nd venting loads while minimizing heat load to tank12Configuration of a standoff with an MLI blanketHigh tensile and shear strengthat cryogenic temperaturesTable 2: Patent Grants that Reference EP29LPSPApplicationEP29LPSP UseCritical PropertiesCryogenic refrigerator7Bond thermally insulated tubes to thermal tube couplersCryogenic Low outgassing Thermal shock resistantProton Exchange Membrane (PEM) fuel cell8Rigidizing a fluid flow plate assemblyElectrical insulationPhysical strengthStructural health monitoring (SHM) system9Affix transducers to structure under testCryogenic Withstand vibrationsFiber optic gyroscopes10Construction of fiber optic sensing coilCryogenic Low outgassingDownload full case studyConclusionThe success of any engineered product depends on the performance of all of its parts, including any chemical compound used to join or protect one or more parts. If an adhesive, coating, or potting compound fails, the product fails. Leading companies, research labs, and inventors around the world rely on Master Bond EP29LPSP to perform unfailingly in extremely demanding applications.Sources1Manufacturing Specification and Statement of Work: FLARE (Facility for Laboratory Reconnection Experiments) Project —Fabrication of Flux Core, FLARE-Spec-03-Rev.00, WP1995, Revision 0, Princeton University Plasma Physics Laboratory, 19 Mar. 2015. https://flare.pppl.gov/Construction/FLARE%20FCSpec-03%2019Mar15.pdf . Accessed September 2023.2Lee, David, et al. Properties of optical fibres at cryogenic temperatures. Monthly Notices of the Royal Astronomical Society, vol. 326, no. 2, 11 Sept. 2001, pp. 774-780. ResearchGate, doi: 10.1046/j.1365-8711.2001.04630.x. Accessed 2 Aug. 2017.3 Reference Surfaces for Scanner Calibration Phoenix Scientific Inc., 2002, www.phnx-sci.com/PPS/Downloads_files/AN2002-01%20Ref%20Surface%20for%20Calibration.pdf. Accessed 2 Aug. 2017.4Chen, Bingqiang. Numerical Performance Prediction of a Miniature Ramjet at Mach 4, MS thesis, Naval Postgraduate School, 2012. https://apps.dtic.mil/sti/citations/tr/ADA567441. Accessed September 2023.5 Xu, Jingke. Study of Argon from Underground Sources for Direct Dark Matter Detection. Dissertation, Princeton University, 2013.6 Hsu, Scott C. Experimental Study of Ion Heating and Acceleration During Magnetic Reconnection. N.P. June 2000. July 2016. http://www.osti.gov/scitech/servlets/purl/7509777Snow, David, et al. “Apparatus and methods for improving vibration isolation, thermal dampening, and optical access in cryogenic refrigerators.” US Patent 8,756,941. 24 Jun. 2014.8Walsh, Michael M. “Fuel cell assembly fluid flow plate having conductive fibers and rigidizing material therein.” US Patent 6,096,450. 1 August 2000.9 Qing, Xinlin, et al. “Method and apparatus for conducting structural health monitoring in a cryogenic, high vibration environment.” US Patent 8,347,722. 8 January 2013.10 Chappell, Charles D. and Kara L. Warrensford. “Systems and methods for controlling the gas conversion in a fiber-optic gyroscope.” US Patent 9,182,230. 10 November 2015.11 Tischler, Hadass. Wolfus, Shuki. Friedman. Alexander. Perel, Eli. Pashut, Tamar. Lavidor, Michal. Alon Korngreen, Alon. Yeshurun, Yosef. Bar-Gad, Izhar. “Mini-coil for magnetic stimulation in the behaving primate.” Bar Ilan University, Ramat Gan, Israel. June 12, 2010. Revised September 28, 2010.12 Alberts, S.J., Doehne, C.J., and Johnson, W.L. “Testing Tensile and Shear Epoxy Strength at Cryogenic Temperatures.” https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20170009145.pdf. Accessed May 2020.