Gap Filler

Gap Filler 3500S35 (Two-Part)

Features & Benefits

  • Thermal conductivity: 3.6 W/m-K
  • Thixotropic nature makes it easy to dispense
  • Two part formulation for easy storage
  • Ultra-conforming – designed for fragile and low-stress applications
  • Ambient or accelerated cure schedules

Description

Gap Filler 3500S35 is the technology leader in thermally conductive, liquid gap filling materials, featuring ultra-high thermal performance and superior softness. The material is a two-component, cured either at room or elevated temperature. Prior to curing, the material maintains good thixotropic characteristics as well as low viscosity. The result is a gel-like liquid material designed to fill air gaps and voids yet flow when acted upon by an external force (e.g. dispensing or assembly process). The material is an excellent solution for interfacing fragile components with high topography and/or stack-up tolerances to a universal heat sink or housing. Once cured, it remains a low modulus elastomer designed to assist in relieving CTE stresses during thermal cycling yet maintain enough modulus to prevent pump-out from the interface. Gap Filler 3500S35 will lightly adhere to surfaces, thus improving surface area contact. Gap Filler 3500S35 is not designed to be a structural adhesive.

Typical Applications include

  • Automotive electronics
  • Discrete components to housing
  • PCBA to housing
  • Fiber optic telecommunications equipment

Properties

Typical properties of Gap Filler 3500S35 (Two-Part)
Properties Imperial Value Metric Value Test Method
Density (Bulk Rubber) (g/cc) 3.0 3.0 ASTM D792
Color / Part A White White Visual
Color / Part B Blue Blue Visual
Viscosity as Mixed (cps) (1) 150,000 150,000 ASTM D2196
Mix Ratio 1:1 1:1 ***
Shelf Life @ 25ºC (months) 5 5 ***
Typical properties of Gap Filler 3500S35 (Two-Part)
Electrical Imperial Value Metric Value Test Method
Dielectric Constant (1000 Hz) 8.0 8.0 ASTM D150
Volume Resistivity (Ohm-meter) 10^9 10^9 ASTM D257
Flame Rating V-O V-O U.L. 94
Dielectric Strength (V/mil)/(V/mm) 275 275 ASTM D149
Dielectric Strength (V/mil) 275 275 ASTM D149
Dielectric Constant (1000 Hz) 8.0 8.0 ASTM D150
Typical properties of Gap Filler 3500S35 (Two-Part)
Thermal Imperial Value Metric Value Test Method
Thermal Conductivity (W/m-K) 3.6 3.6 ASTM D5470
Typical properties of Gap Filler 3500S35 (Two-Part)
Property as Cured Imperial Value Metric Value Test Method
Color Blue Blue Visual
Hardness (Shore 00) (2) 35 35 ASTM D2240
Continuous Use Temp (°F) / (°C) -76 to 392 -60 to 200 ***
Typical properties of Gap Filler 3500S35 (Two-Part)
Cure Schedule Imperial Value Metric Value Test Method
Pot Life @ 25ºC (min) (3) 60 60 ***
Cure @ 25ºC (min) (4) 15 15 ***
Cure @ 100ºC (min) (4) 30 30 ***
Typical properties of Gap Filler 3500S35 (Two-Part)
Electrical As Cured Imperial Value Metric Value Test Method
Dielectric Strength (V/mil) 275 275 ASTM D149
Dielectric Constant (1000 Hz) 8.0 8.0 ASTM D150
Volume Resistivity (Ohm-meter) 10^9 10^9 ASTM D257
Flame Rating V-O V-O U.L. 94
  • (1) Brookfield RV, Heli-Path, Spindle TF @ 20 rpm, 25°C.

  • (2) Thirty second delay value Shore 00 hardness scale.

  • (3) Time for viscosity to double.

  • (4) Cure schedule (rheometer - time to read 90% cure)

Configurations

Configurations available

  • Supplied in catridge and kit form

Downloads

Data Sheet

Gap Filler

Data Sheet

Gap Filler 3500S35

RoHS Certificate

Gap Filler

RoHS Certificate

Gap Filler 3500S35

Halogen Testing Report

Gap Filler

Halogen Testing Report

Gap Filler 3500S35

Safety Data Sheet (SDS)

Gap Filler

Safety Data Sheet (SDS)

Gap Filler 3500S35
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