Which manufacturing process is used to create hollow glass products?

The manufacturing process used to create hollow glass products is blowing. This technique involves inflating a gather of molten glass, typically using a blowpipe, to achieve the desired shape and size. The process allows for the formation of various hollow glass items, such as bottles, vases, and other containers.

The blowing process is essential because it enables the creation of uniform thickness and intricate designs that would be challenging to achieve with other methods. As the glass is inflated, it takes on the properties of a pliable material, allowing artisans to manipulate and shape it effectively while ensuring the final product maintains structural integrity.

Other methods such as slumping are primarily used for shaping flat or sheet glass into different forms rather than hollow products. Shaping can refer to several techniques that may not specifically involve creating hollow structures. Filming, while related to layers and coatings, does not apply to the fabrication of hollow glass items.