Lord Adhesives Autoseal U-2521NM A/B Urethane Sealant System

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Lord Adhesives Autoseal U-2521NM A/B Urethane Sealant System
Categories:	Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane, Adhesive
Material Notes:	LORD Autoseal® U-2521NM A/B urethane is a solvent-free, two-component urethane used for casting and laminating flexible and rigid windows, transparent adhesives and electrical potting and sealing compounds. Typical applications include safety goggles, gas mask view shields, shatter-proof coatings and safety glass laminates. Features: provides easy casting of transparent elastomers with a variety of hardness. provides excellent adhesion to a variety of plastic and other substrates. cures to an optically clear coating; withstands UV exposure without significant change in haze or color./p> can be used on parts and devices that experience operating temperatures from -40 to +100°C (-40 to 212°F); can tolerate short term exposure up to 150°C (302°F). All information provided by Lord.
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Physical Properties	Original Value	Comments

Specific Gravity	1.03 g/cc	mixed
Viscosity	50 - 200 cP @Temperature 27.0 °C	U-2521NM B Hardener
	600 cP @Temperature 27.0 °C	Mixed
	400 - 1000 cP @Temperature 27.0 °C	U-2521NM A Resin

Mechanical Properties	Original Value	Comments
Hardness, Shore D	45	cured; ASTM D 2240
Tensile Strength	2900 psi	cured; ASTM D 638
Elongation at Break	200 %	cured; ASTM D 638

Thermal Properties	Original Value	Comments
CTE, linear	173 µm/m-°C	cured
Maximum Service Temperature, Air	212 °F
Minimum Service Temperature, Air	-40.0 °F
Glass Transition Temp, Tg	15.0 °C	cured

Processing Properties	Original Value	Comments
Working Life	50.0 min @Temperature 25.0 °C	working life, 50 g mass, 0.3% Hg catalyst
Gel Time	25.0 min @Temperature 25.0 °C	mixed, with 0.3% Hg catalyst
Shelf Life	6.00 Month @Temperature 21.0 - 27.0 °C	each component, from date of manufacture when stored in original, unopened container

Descriptive Properties
Appearance	Clear Liquid	U-2521NM A Resin
	Clear Liquid	U-2521NM B Hardener
	Clear, slightly amber liquid	Mixed

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PLORD9241 / 232597

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