ALuminum and Copper core fireworks star plate pyrotechnic tools Crossette Star Pump

A “Crossette Star Pump” is a specialized tool used in pyrotechnics to create a particular type of firework star called a “crossette.” These stars are known for their distinctive splitting effect, where they break apart into multiple pieces, usually four, creating a cross-like pattern in the sky.

Here’s a breakdown of what makes a crossette star pump unique:

Cavity Design: Unlike standard star pumps that produce simple cylindrical stars, a crossette star pump has a specially designed plunger with a cross-shaped or multi-pronged tip. This tip creates a corresponding cavity within the star composition.
Break Charge: This cavity is later filled with a “break charge,” a small amount of explosive composition (often flash powder) that causes the star to split apart when ignited.
Construction: Crossette star pumps are typically made of durable materials like brass or steel to withstand the pressure of compressing the star composition.
How it Works:

Fill the Pump: The pump cylinder is filled with the star composition.Create the Cavity: The plunger with the cross-shaped tip is pressed into the composition, creating the cavity.
Eject and Prepare: The star is ejected from the pump and allowed to dry. The cavity is then carefully filled with the break charge and sealed.

If you’re interested in delving deeper into firework making, resources like Skylighter offer valuable information and guidance.