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LOCTITE ABLESTIK QMI536NB is a low-bleed, non- conductive, PTFE-filled paste designed for stacked die applications which require very low stress and robust mechanical properties. The material has the same processing and properties of QMI536 but resin bleed is essentially eliminated. These features produce fast cure capability and enhanced reliability performance to a wide variety of surfaces, including solder resist, flexible tape, bare silicon and various die passivations. A package or device manufactured with this product will have high resistance to delamination and popcorning after multiple exposures to lead-free solder reflow temperatures.
LOCTITE ABLESTIK QMI536NB is a Bismaleimide (BMI) based product. QMI products are typically lower modulus at 25C vs epoxies and therefore lower in strength. They make up for it at higher temps where they are typically higher in strength than epoxies, something very beneficial during reliability testing. At the same time their lower modulus (“flexibility”) is also leading to less stress during temp cycling, temp shock and vibration testing. Because of their high temperature stable and hydrophobic properties, such BMI materials have replaced many epoxy die attach materials when Pb free 260 reflow had to be survived.
Pull strength of Bismaleimide based resins in different tempsIt has been observed that BMI based hybrids do not perform well on pull tests. BMI resin based QMI products are typically lower modulus at 25°C vs epoxies and therefore lower in strength. But, and that's the most important point, at higher temps they are typically higher in strength than epoxies, something that benefits high temp operation applications up to 200°C !
This lower modulus (“flexibility”) is also leading to less stress during temp cycling, temp shock and vibration testing.
Since it contains silanes, is this a silicone or an epoxy based resin?
BMI resin based adhesives are Silicone free! Silanes are added in small quantities as adhesion promoter. And to add to that since you're wondering how to classify it, we’re not aware of any BMI/epoxy cross contamination.