ECCOBOND 3707F

Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other

ECCOBOND 3707F

Main features

  • UV Cure with Heat Backup
  • No-Flow WLCSP/BGA Encapsulation
  • UV-Fluorescent Inspection

Product Description

LOCTITE ECCOBOND EN 3707F is a one-part, light-yellow no-flow epoxy encapsulant for local protection of WLCSP and BGA devices on circuit boards. The material uses UV cure with a secondary heat-cure initiator for shadowed areas and fluoresces under UV light for visual inspection. Typical viscosity is 3,480 mPa s at 25 deg C, with a 3-day pot life and 180-day shelf life at 2 to 8 deg C. Recommended UV processing uses UVA or UVB at 100 mW/cm^2 for more than 30 seconds. Heat-cure alternatives include 30 minutes at 80 deg C, 5 minutes at 100 deg C, or 1 to 2 minutes at 130 deg C. The cured epoxy has a typical Tg of 36.8 deg C by TMA.

Key features

  • UV Cure with Secondary Heat Cure: Thermal cure addresses shadowed areas not directly exposed to UV.
  • 3480 cP Viscosity at 25 deg C: Typical uncured rheology applies to the one-component no-flow epoxy.
  • 36.8 deg C Glass Transition Temperature: Typical CTE is 50.3 ppm/deg C below Tg and 162.2 ppm/deg C above Tg.
Product Family

ECCOBOND 3707F

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Light yellow liquid
Physical Properties
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
3,480 mPa.s
Thermal Properties
Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding. The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.
36.8 °C

Additional Information

Technical properties

As-supplied / before-processing properties

PropertyValueUnitMethod / condition
Viscosity3,480mPa sBrookfield CP51, 25 deg C, 20 rpm; typical
Pot life3days25 deg C; typical
Shelf life180days2 to 8 deg C; typical
UV light intensity100mW/cm^2UVA or UVB; recommended
UV exposure time>30sAt 100 mW/cm^2; recommended
Heat cure schedule30 min / 5 min / 1 to 2 min-At 80 / 100 / 130 deg C respectively; guideline
Technical properties

After-processing / final-state properties

PropertyValueUnitMethod / condition
CTE below Tg50.3ppm/deg CTMA; typical
CTE above Tg162.2ppm/deg CTMA; typical
Glass transition temperature36.8deg CTMA; typical
Storage modulus4,400N/mm^2DMA at 25 deg C; typical

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