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Creative Materials expands a series of functional B-staged epoxy films. These lines of film products include isotropic and anisotropic electrically conductive options as well as thermally conductive and electrically insulating options. The high reliability and controlled reflow allow these adhesive films to be used to eliminate ingress to vias or bleed into sensitive areas and set them apart from typical die attach films. These series of products are available in sheets and can be provided as custom preforms to customer-specified geometries or in custom length and width rolls. Examples of products include: 125-22-F which is an isotropically conductive series of films available in standard thicknesses of 1-5 mils; other thicknesses can be requested and 126-37-F which is an anisotropically conductive series of films which are able to accommodate a variety of pitch and contact sizes. 127-03-F provides electrical insulation with a high thermal conductivity for thermal management and structural bonding. These films and preforms are supplied on an easy-to-remove release liner.
These products offer excellent thermal stability and high temperature properties to 325C intermittent and 230°C continuous, excellent electrical properties, chemical resistance when fully cured, adhesion to a wide variety of metallic and organic surfaces, minimal flow during bonding and curing, and low CTE. Cure temperature are typically around 150°C but low temperature curing versions are available for even less than 100C.
These products are typically used in conductive splicing of ribbon cables, PTF circuits, electrical attachment of surface-mounted devices, heat sinking, as well as assembly of electrical and electronic components. The anisotropic product is used when shorts between closely spaced contacts is a concern.