Master Bond -- EP29LPSP -- Epoxy for Service at Cryogenic Temperatures - Master Bond - #1

Master Bond Polymer System EP29LPSP is a two component, high performance, modified low temperature heat cured epoxy system specially formulated for cryogenic applications. Not only is EP29LPSP able to function as an adhesive, sealant and protective coating at temperatures as low as 4°K, but it is also able to withstand cryogenic shocks (i.e. from room temperature down to liquid helium temperatures in a 5-10 minute time period). This optically clear, low viscosity cryogenic epoxy bonds well to a wide variety of substrates including metals, glass, ceramics, and many different plastics. The working life is long; a 100 gram mass will allow over 90-120 minutes of working life. The EP29LPSP has superior electrical insulation properties and a good chemical resistance profile. EP29LPSP requires gelling the mixed epoxy at room temperature for 1 to 2 hours followed by alternative lower elevated temperature cure cycles (8/10 hrs @ 130°/150°F (54°/66°C)) or (5/7 hrs @ 175°F (80°C)) or (3/5 hrs @ 200°F (93°C)). A thermally conductive version called EP29LPSPAO is also available.

• Exceptionally low mixed viscosity; contains no solvents or other volatiles.

• Long working life at ambient temperatures.

• Superior physical strength properties and thermal shock resistance.

• Excellent electrical insulation characteristics.

• High bonding strength to a wide variety of substrates.

• Good chemical resistance to water, fuels, acids, bases and salts.

• Excellent optical clarity.

• Low exotherm.

• Serviceable at cryogenic temperatures down to 4°K.

• Capable of withstanding cryogenic shocks.

Mixing ratio, part A to part B by weight .......................................................................................100/65

Viscosity, mixed, cps, 75°F .............................................................................................................. 400

Working life after mixing, 100 gram mass, 75°F............................................................90-120 minutes

Cure schedule - Gel at room temp followed by any option listed below......................................1-2 hrs

130°-150°F (54-56 °C)...................................................................................................8-10 hrs

175°F (79°C)...................................................................................................................5-7 hrs

200°F (93°C) ................................................................................................................... 3-5 hrs

Tensile shear strength (psi) Aluminum to Aluminum, 75°F............................................................. 3000

Tensile strength, 75°F, psi ............................................................................................................. 6500

Tensile elongation, 75°F, % ............................................................................................................... 12

Tensile modulus, 75°F, psi....................................................................................................... >375,000

Thermal conductivity, 75°F, BTU-in/ft² «hr«°F.....................................................................................0.8

Coefficient of thermal expansion, in/in x 10^-6/°C.................................................................................45

Volume resistivity, 75°F, ohm-cm ..................................................................................................>10¹⁵

Dielectric constant ............................................................................................................................. 3.9

Hardness, Shore D.............................................................................................................................. 80

Service temperature range, °F (°C)...................................................................4°K to +275°F (135)

Shelf life at 75°F, in unopened containers ........................................................................ 6 months

Parts A and B available in pint, quart, gallon and 5 gallon containers

Adhesives, Sealants & Coatings • 154 Hobart Street • Hackensack, NJ 07601-3922 • Tel: 201-343-8983

Internet Address: http://www.masterbond.com - 1 -