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Metal adhesives

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Master Bond MasterSil 323Med Two component, medical grade silicone
Categories: Polymer; Thermoset; Silicone

Material Notes: Key Features:
  • Addition cured
  • Convenient processing
  • Excellent strength properties
  • Meets ISO 10993-5
Product Description: Master Bond MasterSil 323Med is a two component silicone for high performance bonding, sealing, and encapsulating. It does not require air when polymerizing and does not outgas while curing. It has a forgiving one to one mix ratio by weight. Although higher in viscosity, it is easily mixed and has good flow properties. It is a low exothermic material with a long open time of about 2-3 hours. It cures at ambient temperatures in 48-72 hours or in 2-4 hours at 135-165°F. The optimum cure is overnight at room temperature followed by 2-4 hours at 135-165°F. This silicone contains no solvents or diluents and has very low shrinkage upon curing. MasterSil 323Med bonds well to a wide variety of substrates including metal, glass, plastics and ceramics, as well as to silicone rubber. It can withstand the most rigorous kinds of thermal shock and cycling without cracking or exerting stress on components. It can be used on disposable and reusable medical devices and it will resist various forms of sterilization including dry heat, UV and gamma radiation, EtO, glutaraldehyde, and other chemical sterilants. It has a Shore A hardness of 35 to 45. The combination of high viscosity but flowability prior to curing, and especially good bond strength after curing, is noteworthy. The service temperature range is from -65°F to +400°F. Other notable features are its optical clarity, especially in thinner sections, and its superior electrical insulation profile. MasterSil 323Med is a good candidate for disposable and reusable medical device manufacturing where a high viscosity silicone with a good strength profile is required.

Product Advantages:

  • Addition cured, no by-products released during cure
  • Flowable, with long open time
  • Optically clear, especially in thin sections
  • Good bond strength
  • Low dielectric constant
  • Well suited for potting and encapsulation

Information provided by Master Bond.

Vendors: Master Bond is a leading manufacturer of adhesives, sealants, coatings and potting compounds. Master Bond’s vast product line consists of over 3,000 epoxy, polyurethane, silicone, cyanoacrylate and latex adhesives that vary in viscosity, cure speed, strength, chemical resistance, electrical properties, etc. Our custom adhesives offer design flexibility and provide excellent bonding performance. Visit www.masterbond.com.

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Physical PropertiesOriginal ValueComments
Viscosity 10000 - 25000 cPPart B
 15000 - 30000 cPPart A
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 35 - 45
Tensile Strength 100 - 200 psi
Elongation at Break 150 - 250 %
Tensile Modulus 100 - 175 psi
Adhesive Bond Strength 200 - 250 psiTensile lap shear, Al to Al
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity 1.00e+14 ohm-cm
Dielectric Constant 2.8
@Frequency 1e+6 Hz
Dielectric Strength 450 V/mil
@Thickness 3.17 mm
 
Thermal PropertiesOriginal ValueComments
CTE, linear 400 - 450 µm/m-°C
Maximum Service Temperature, Air 400 °F
Minimum Service Temperature, Air -65.0 °F
 
Optical PropertiesOriginal ValueComments
Refractive Index 1.44
 
Processing PropertiesOriginal ValueComments
Cure Time 2.00 - 4.00 hour
@Temperature 57.2 - 73.9 °C
Optimum: Overnight at 75°F followed by 2-4 hours at 135-165°F
 2.00 - 4.00 hour
@Temperature 57.2 - 73.9 °C
Option 2
 48.0 - 72.0 hour
@Temperature 23.9 °C
Option 1
Working Life 2.00 - 3.00 hourafter mixing, 100 gram batch
Shelf Life 6.00 Monthin original, unopened containers
 
Descriptive Properties
Mixing ratio1:1 by weightParts A to B

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PMASTM5936 / 306825

Metal adhesives

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