In Line Phased Array Inspection of Encapsulated Battery Structural Adhesives
Inline phased array testing maps structural adhesive wet-out and void formation through metal pack enclosures in real time at production line speeds.
Alumina Trihydrate Filler
Meaning
Chemical additive for polymer compounds provides flame retardancy and smoke suppression through endothermic decomposition. When used in battery housing, alumina trihydrate filler releases water vapor at approximately 200 degrees Celsius to cool the surrounding material. This mechanism prevents the spread of fire without releasing toxic gases.
Thermal Performance
Release of moisture occurs when the mineral reaches its critical temperature threshold. Because the alumina trihydrate filler absorbs heat during this phase change, it effectively lowers the surface temperature of a composite part. High loading levels are necessary to achieve the desired fire rating (UL 94 V-0).
If the temperature remains below the activation point, the filler remains inert and stable. The vapor pressure generated during decomposition also acts to dilute combustible gases.
Mechanical Effect
Influence on the physical properties of the host resin depends on particle size and surface treatment. Incorporating alumina trihydrate filler often increases the stiffness of the component while reducing its tensile strength. Precise grading of the powder ensures that the material flows correctly during the injection molding process.
Sourcing Requirement
Selection of a supplier depends on the purity and moisture content of the raw mineral. Buyers evaluate alumina trihydrate filler based on its chemical consistency and the absence of iron contaminants. Proper storage is required to prevent agglomeration before use in production.