ALPHA SM42-1311

Harmonization Code : 3208.20.90 | Paints and varnishes that are dispersed or dissolved in a non aqueous medium

ALPHA SM42-1311

Main features

  • High-Speed Room-Temperature Dispensing
  • 80-Second Cure at 150 deg C
  • Non-Sagging Epoxy Paste

Product Description

ALPHA SM42-1311 SMD Adhesive is a one-component, fast-curing red epoxy paste for high-speed dispensing and surface-mount component attachment. Its non-sagging rheology and thixotropic index of at least 5.0 support controlled dot formation at room temperature. The adhesive develops full properties after a minimum 120 seconds at 120 deg C or 80 seconds at 150 deg C in a convection oven. Typical uncured data include 350 to 550 Poise viscosity at 25 deg C and 1.1 to 1.3 specific gravity. Documented cured properties include at least 90 deg C glass-transition temperature, less than 1.0% moisture absorption, and greater than 1 x 10^12 ohm insulation resistance under the stated test conditions.

Key features

  • High-speed dispensing: Designed for room-temperature dispensing in surface-mount assembly.
  • Short heat-cure options: Full property development at 120 deg C for 120 seconds or 150 deg C for 80 seconds minimum.
  • Non-sagging epoxy paste: A thixotropic index of at least 5.0 supports controlled placement.

Applications

Dispensed surface-mount component attachment in electronics assembly.

Product Family

ALPHA SM42-1311

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TDS, SDS & Technical Documents

Technical Specifications

Physical Properties
Thixotropic index
Thixotropic Index is a ratio of a material s viscosity at two different speeds in Ambient temperature, generally different by a factor of ten. A thixotropic material s viscosity will decrease as agitation or pressure is increased. It indicates the capability of a material to hold its shape. Mayonnaise is a great example of this. It holds its shape very well, but when a shear stress is applied, the material easily spreads. It helps in choosing a material in accordance to the application, dispense method and viscosity of a material.
≥ 5.0
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
35000–55000 Poise mPa.s
General Properties
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.1–1.3
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.
≥ 90 °C

Additional Information

Technical properties

As-supplied / before-processing properties

PropertyValueUnitMethod / condition
ChemistryEpoxyUncured material
AppearanceRed pasteUncured material
Viscosity350 to 550PoiseMalcom PC-10A, 30 rpm, 25 deg C
Specific gravity1.1 to 1.3Typical uncured value
Thixotropic index>= 5.0Tentative specification
Pot life7days25 deg C
Shelf life6months1 to 10 deg C
Shelf life14days25 deg C
Technical properties

After-processing / final-state properties

Typical cured-material values; cure basis is at least 120 seconds at 120 deg C or 80 seconds at 150 deg C in a convection oven.

PropertyValueUnitMethod / condition
Glass-transition temperature>= 90deg CTMA
CTE alpha160 +/- 10ppmBelow Tg; TMA
CTE alpha2190 +/- 20ppmAbove Tg; TMA
CorrosionNone96 hours at 40 deg C and 95% RH
Moisture absorption< 1.0% by weight24 hours in water at 25 deg C
Insulation resistance> 1 x 10^12ohm96 hours at 85 deg C and 85% RH
Hardness80 to 90Shore DTypical cured value

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