Adhesives Designed for Assembling Cryogenic Laboratory and Medical Equipment

Adhesives for Cryogenic Medical Equipment Assembly

Special one and two component Master Bond adhesive formulations play an essential role in the construction of cryogenic refrigerators, freezers, storage systems for biological samples, respiratory products, pipes, pressure vessels, purifiers, cryosurgical systems, canisters, and accessories. These liquid/paste products comply with stringent manufacturing specifications and have exhibited reliable, efficient, performance for use in healthcare, biotechnology, and research applications.

Minimally invasive cryosurgery employs image-guidance techniques such as magnetic resonance (MR), ultrasound, computed tomography to target and obliterate diseased tissue through intense cold. Liquid nitrogen or high pressure argon gas flows into a cryoprobe which often kills the cells upon contact. Bronchoscopes, laparoscopes, transducers, spray devices in addition to cryoprobes also contain different Master Bond grades for optimization of precise, exact execution of procedures done outside and through the skin surface. Some examples of cryosurgery performed for benign and malignant skin conditions include warts, moles, small skin cancers, solar keratoses, and skin tags.

Cryosurgery has additionally successfully been used for treating cancers such as prostate tumors, liver tumors, primarily liver cancer that has not spread, retinoblastoma, and low grade cancerous and non cancerous tumors of the bone.

Scientists are presently studying cryosurgery for breast, colon, and kidney cancer. It is important to note that minimal invasive cryosurgery procedures are often preferred, because it minimizes pain, scarring, bleeding, and shortens hospital stays. Freezing the cells beyond a certain level will tear the cells apart without effecting nearby healthy tissue. Other cryogenic applications include vaccine transport, therapeutics, or diagnostics that may be used in developing medical counter measures for pandemics such as COVID-19.

Master Bond has developed a comprehensive line of unique cryogenic adhesive systems that feature unique capabilities. Most noteworthy for medical and laboratories are specialty products that are intended for adhering dissimilar substrates, possess NASA low outgassing certification, are electrically conductive, heat dissipative, fast curing, optically clear, chemical resistant, have low coefficient of thermal expansion, high durability or exceptional strength characteristics. Customized products have enabled solutions for challenging needs.

Products	Service Temperature Range	Key Feature
EP62-1LPSPMed	4K to 400°F	Ultra low viscosity
EP30DPBFMed	4K to 250°F	Flexible at room temperature
EP29LPSP	4K to 275°F	Low stress under cryogenic conditions
EP21TDCSMed	4K to 250°F	Excellent electrical conductivity
EP42HT-4AOMED Black	4K to 400°F	Thermally conductive, and electrically insulative

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Adhesives for Assembling Cryogenic Laboratory and Medical Equipment

EP62-1LPSPMed

Ultra low viscosity, toughened epoxy with superior electrical insulation properties. Thermal stability. Exceptional sterilization resistance. Long working life. Low exotherm. Passes USP Class VI and ISO 10993-5 requirements. Serviceable from -150°F to +400°F.

EP30DPMed Two Component Epoxy-Urethane Blended System

EP30DPBFMed

Epoxy-urethane blend. Superior toughness and abrasion resistance. Biocompatible. Cryogenically serviceable. Low viscosity. Low moisture absorption and hydrolytic stability. USP Class VI approved. Serviceable from 4k to +250°F. Outstanding electrical insulation properties. Withstands thermal cycling. High impact strength.

EP29LPSP

Two part epoxy system with ultra low viscosity and remarkable cryogenic properties. Withstands rapid drop in temperature and is NASA low outgassing approved. Optically clear. Long working life. Low exotherm. Excellent resistance to acids, bases and many solvents. Outstanding electrical insulative properties. Service operating temperature range from 4K to +275°F.

EP21TDCSMed

Silver conductive epoxy with low volume resistivity and USP Class VI certification. Cures at room temperature or more quickly at elevated temperatures. Durable. Serviceable from 4k to +250°F. Smooth paste. One to one mix ratio by weight or volume. Shore D hardness 50-60. High bond strength.

EP42HT-4AOMed Black

Thermally conductive, electrically insulative two part epoxy. Meets USP Class VI and ISO 10993-5 certifications. Cryogenically serviceable from 4K to +400F. NASA low outgassing aproved. Black in color. For bonding, sealing, coating and casting.

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Latest Developments

Case Study

EP114: Utilized to produce nanocomposites via vacuum infiltration

Master Bond EP114 is a two-component nano silica filled epoxy system which offers excellent dimensional stability and a very high glass transition temperature (Tg > 200°C upon curing. Its ultra-low initial mixed viscosity (500–1500 cps at room temperature) can be further reduced by preheating to a slightly higher temperature, making EP114 ideal for vacuum infiltration to produce dense nanocomposites, as shown in the case study below.

EP42HT-2ND-2Med Black Two Part Epoxy System

Technical Data Sheet Excerpt

EP42HT-2ND-2Med Black Product Information

Two component epoxy paste adhesive. Resists sterilization exposure. USP Class VI approved. Outstanding thermal stability and electrical insulation properties. Cures at ambient temperatures. Withstands multiple cycles of autoclaving, radiation, EtO and chemical sterilants. Post curing is recommended to optimize physical properties. Serviceable from -60°F to +450°F.

White Paper

Epoxy Compounds Get Even Tougher

With adhesive products, high performance and rigidity are often thought to go hand in hand. And it is true that the very best strength, thermal, chemical and electrical properties tend to be found in rigid compounds, especially epoxies. Yet there is a growing class of adhesives, sealants and coatings that add ductility to the long list of desirable epoxy properties. Master Bond’s white paper examines the use of these toughened epoxies.

White Paper

Spotlight on Silicones

Silicone adhesive systems have several important performance characteristics that distinguish them from other adhesive families. Learn more about their unique combination of flexibility, high temperature resistance, and more specialized engineering properties.

White Paper

Electrically Conductive Adhesives Make Right Connections

As electronic circuits become more complex, engineers are finding new ways to assemble and package them. Electrically conductive adhesives provide durable bonds with conductive paths to suit a variety of electronics applications. They can be engineered to combine bond strength and electrical conductivity with other service-critical properties.

Technical Data Sheet Excerpt

EP37-3FLF Product Information

Highly flexible, low viscosity, optically clear adhesive. Resistant to severe thermal cycling and thermal shock. Bonds well to dissimilar substrates. Low exotherm system. Long working life. Superior electrical insulation properties. Service temperature range from 4K to +250°F. One to one mix ratio by weight or volume.

Lab Report

Testing Adhesives for Resistance to Xylene

Many Master Bond epoxy systems are formulated with superior chemical resistance. In the lab, we continually test our materials by exposing them to specific chemicals over a long period of time. A common way of testing the chemical compatibility of an epoxy is immersing a sample in a chemical and measuring its change in weight over time. A significant loss or gain in weight would indicate a decreased ability of a material to stand up to chemical exposure. These tests allow us to more accurately recommend the right adhesive based on specific application requirements.In this experiment, we focused on testing our epoxies for their resistance to xylene. The compounds Master Bond used for testing are a variety of two component epoxies and one component UV curing systems with good overall chemical resistance. For the first round of testing the products tested were EP41S-5LV, EP42HT-2AO-1, EP46HT-2AO Black, UV16, UV22DC80-1, and UV26. For the second round of testing the products tested were EP125, EP42HT-2 and UV25. For the final round the products tested were EP41S-5, EP41S-1HT, EP62-1HT and EP62-1. These were compared against the resistance of a generic or standard non-chemically resistant epoxy. A few thin castings, roughly 2 inches in diameter and around 0.125 inches thick, were made for each product and cured in accordance to their specifications. Once the cured samples were created and initial weight was recorded, we submerged them in xylene. Then we continued recording weekly weight measurements. We carried on these tests with frequent weight recording for varying lengths of time based on the products performance. Below you will see the results for soaking results for around 10 months in the first batch, 2 years for the next batch, and greater than 2.5 years for the third batch of products. The castings were weighed periodically and the graphs shown below demonstrate the percentage of weight change over time.For the purpose of comparison, please notice that for each testing timeframe, a casting of a standard epoxy was also tested under these same conditions which served as a reference. As can be seen in the graphs, the standard epoxy was not as resistant to xylene as the other epoxies tested. It demonstrated a significantly greater change in weight over time, and the casting ultimately dissolved in xylene after 15 weeks.In general, a swelling of less than 4-5% can be considered excellent, especially since this test may be more rigorous compared to actual service conditions. It is also worth noting that in the context of a bonded joint or a potted assembly the exposure to xylene might not be as severe or direct as in the above test conditions.Please note, when choosing an epoxy for an application where the resistance to xylene is critical, many other factors must be considered in addition to the chemical resistance. Each of the epoxies in the charts above offers a distinct set of performance properties. For example, if thermal conductivity and high temperature resistance are needed, EP46HT-2AO Black may be a good option. If a fast cure is required and there is full access to a light source with no shadows, UV26 can be considered. For longer term exposure to xylene over several months to a year or longer, the likes of UV25, EP125 EP41S-5, and EP62-1 are excellent candidates. They all need to be processed or cured differently and although some of them can be cured at room temperature alone, for enhancing/optimizing chemical resistance especially to xylene, it is critical to add heat.Disclaimer: The findings in this article are not meant to be used for specification purposes.

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