Glass Container Components and Defects

A set of practice vocabulary flashcards covering the components of glass containers and various critical, major, and minor defects based on the lecture transcript.

Wide Mouth

A type of container used for food products such as jam and honey.

Narrow Neck

A type of container used for beer, wines, and spirits.

Glass Colors

The standard colors for glass containers including green, blue, amber, and white flint.

Mould Number

A number usually found on the base or somewhere near the heel or shoulder of all containers.

Wire Edge

A critical defect characterized by sharp glass found in the ring area.

Flange

A sharp edge that runs part of the way in the ring (internal) or outer (external).

Sugary Top

A critical defect where a powdered ring could become flaky.

Top Hat / High Top

A critical defect consisting of an extra lip of glass raised above the ring.

Crushed Ring

A ridge of sharp broken glass found around the ring.

Choked Bore

A critical defect where glass in part blocks the bore.

Plug Pull / Stuck Plug

A defect found $99\%$ of the time in the bore.

Birdcage

A thread of glass across the inside of the container; it is important to hold colored glass up to the light to see it.

Broken Metal

A break in the bottle that could be the start of a birdcage.

B.O.N (Bottom of Neck)

A crizz or split found on the seam at the bottom of the neck $99\%$ of the time.

Stuck Glass

A fragment or fragments of glass stuck anywhere inside the container.

Fused Glass

Found outside the container when containers stick together while hot and are later split up.

Internal Blister

An area of glass that has become thin and will break.

Body Bleb

A broken blister found on the outside of the container.

Skin Blister

A broken blister found inside the container.

Finn

A defect where one part of the seam is raised.

Open Mould

A defect where seams are raised and can be quite sharp if broken.

Spike

A sharp projection usually found from the base or sidewall.

Freak

A badly deformed container.

Tramp Glass

Loose pieces of glass in a container or on packaging.

Internal Contamination

Anything found inside a container, such as dust, a plaster, or a fly.

Crizz

A fine fracture on the surface of the glass.

Split

A deep fracture that cuts all the way through the glass.

Slug Neck

A major general defect consisting of a ledge of glass that runs partway in the neck.

Halo

A ledge of glass that runs around in the neck or upper body region.

Blister (General)

Large or small oval shaped gas bubbles in the glass; small ones are acceptable.

Stone

Usually white, but can be black or brown; can be found with splits around them, known as a stress stone.

Loading / Body Mark

Marks on the surface of the glass that are sometimes acceptable depending on how heavy or deep they are.

N.F.U (Not Filled Up)

A defect where the ring is not formed properly.

Cold Mould

An easily seen chilled appearance that affects the whole container.

Sunken Panel

Found on square containers when the panel is not formed properly.

Pipe/Tube Mark

A dark hit place that can be caused when handling.

Offset Top

A defect where all the top goes off to one side and is not in line with the neck.

Metal Inclusion

A defect caused by foreign metallic matter in the glass.

Runoff

A defect resembling a glass ball found inside the container.

Line Over Ring

A fine hair line defect that is critical on all food and drinks containers.

Bullseye

A volcano type crator projecting from the internal base, similar to a candle stick holder.