Phase-change thermal interface materials Thermally conductive adhesive

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Phase-change thermal interface materials Thermally conductive adhesive

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Phase-change thermal interface materials Thermally conductive adhesive tapes Thermally conductive insulator pads Thermally conductive fillers Thermally conductive silicone compounds Flexible heat spreaders Thermal management BGAs
LEADER THERMAL MANAGEMENT: DESIGN, INNOVATION MATERIALS
TECHNICAL BULLETIN
CHO-THERM 1671 Thermally Conductive Elastomer Insulators
FEATURES thermal impedance High dielectric strength Proven reliability demanding military aerospace applications MATERIAL DESCRIPTION PRODUCT FORM OPTIONS CHO-THERM 1671 insulators silicone elastomers, precisely filled with controlled dispersion boron nitride particles provide superior thermal electrical performance characteristics. Reinforced with fiberglass cloth, they offer maximum resistance tear, cutthrough, punctures burrs other mating surface irregularities. CHO-THERM 1671 material available sheet form die-cut configurations. also available with optional pressure-sensitive adhesive coating facilitate assembly production. CRITICAL PERFORMANCE CHARACTERISTICS There generally objectives that must satisfied interface between power semiconductor devices their heat sinks: enhance flow heat from device metal heat sink. electrically isolate device from metal heat sink. CHO-THERM 1671 insulators perform both functions simultaneously, effectively replacing commonly used combination ceramic insulators silicone grease usually required achieve these objectives high performance applications. THERMAL INTERFACE IMPEDANCE thermal impedance interface depends greatly number different parameters, including flatness smoothness mating surfaces forming interface contact pressure between them, well thickness interface material, thermal conductivity conformability. CONTACT PRESSURE MOUNTING TORQUE optimum contact pressure range CHO-THERM materials 300-500 (2.07 3.45 106N/m2). Beyond this range,performance gains negligible.
continued
TYPICAL PROPERTIES
1671 Silicone Boron Nitride Fiberglass White 0.015 (0.38)* 0.23 (1.48) +200 4000 1014 1000 (6.89) (17.5) 1.55 File E57104 0.76 0.07
TEST METHOD Visual ASD374 ASD5470 ASD5470 ASD149 ASD257 ASD412 ASD624 ASD412 ASD2240 ASD792 QMFZ2 ASE595
CONSTRUCTION THERMAL ELEC. MECHANICAL
Binder Filler Carrier Color Thickness, inch (mm) Thermal Impedance, °C-in2 (°C-cm2 Thermal Conductivity, W/m-K Operating Temperature Range, (°C) Voltage Breakdown, Volume Resistivity, ohm-cm Tensile Strength, (MPa) Tear Strength, lb/in (kN/m) Elongation, Hardness (Shore Specific Gravity Recognized Outgassing: CVCM
TML= Total Mass Loss CVCM= Collected Volatile Condensible Materials *CHO-THERM 1671 material available custom thicknesses. (Contact Chomerics part numbers) Note: Pressure-sensitive adhesive increase thermal impedance much 0.05°C-in2/W (0.32°C-cm2/W). Contact Chomerics further information.
October1999
Headquarters TEL: 781-935-4850 FAX: 781-933-4318 www.chomerics.com Europe TEL: +(44) 1628 404000 FAX: +(44) 1628 404090 Asia Pacific TEL: +(852) 8008 FAX: +(852) 8253
Seals
CHO-THERM® 1671 Thermally Conductive Insulators continued convert mounting torque into contact pressure, following equation: (0.2) (0.2) Contact Pressure (psi N/m2) Torque (in-lbs N-m) Number Fasteners Average Friction Factor Diameter (in. Contact Area (in2
IMPROVEMENT THERMAL IMPEDANCE WITH TIME thermal impedance characteristics CHO-THERM materials expected improve during stress relaxation elastomer consequent additional filling microscopic voids interface surfaces. Improvement much 10-15% after first weeks use. VOLTAGE BREAKDOWN CHARACTERISTICS When using thermal interface pads electrically isolate component from metal heat sink chassis, critical material property
dielectric strength. Dielectric strength measure well material prevent voltage component case from arcing through material allowing electrical short circuit between component metal mounting surface. This property commonly presented voltage breakdown shown Typical Properties Table determined electrical testing multiple flat sheet samples accordance with test procedures detailed ASD149. higher value voltage breakdown, better material withstanding applied voltages. dielectric strength material also affected many external factors including: insulator thickness, area contact surfaces, temperature, humidity, mechanical stress applied insulator, presence partial discharge, etc. Contact Chomerics Applications Engineering details test methods assistance with electrical requirements your specific application.
CHEMICAL SOLVENT RESISTANCE Exposure petrochemicals chlorinated solvents, such trichlorethylene, freon, toluene, trichlorethane other cleaning agents, chemicals solvents used vapor degreasing, defluxing cleaning operations harmful CHO-THERM 1671 material although exposed edges tend swell. amount swelling function exposure time type solvent. After drying out, exposed edges will return their former size condition with effect thermal electrical properties. ORDERING INFORMATION Using diagram below, construct appropriate part number: WW-XXYYYY-1671. Part numbers nonstandard configurations will assigned Chomerics. non-symmetrical, die-cut parts, drawing indicating which side adhesive applied must submitted Chomerics.
YYYY
Die-cut Parts Contact Chomerics standard configurations part numbers.
1671
Sheet Stock
Standard die-cut part Custom die-cut part Sheet stock Sheet stock side
0808 (20.3
Die-cut Parts Sheet Stock Without .015 (.381mm) PSA, side
Headquarters TEL: 781-935-4850 FAX: 781-933-4318 www.chomerics.com Europe TEL: +(44) 1628 404000 FAX: +(44) 1628 404090 Asia Pacific TEL: +(852) 8008 FAX: +(852) 8253
Seals
October1999

Phase-change thermal interface materials Thermally conductive adhesive

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