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custom glass Surface Deactivation Critical Cleaning #Bar coding terminology

Cyclo-olefin Copolymer (COC)

Cyclo-olefin copolymers are a family of amorphous, transparent copolymers based on cyclo-olefins and linear olefins. Performance characteristics of cyclo-olefins include low density, excellent transparency, low water absorption, excellent vapor barrier properties, heat deflection temperatures up to 170°C, excellent bio-compatibility and chemical resistance. Poor gas barrier properties. Sterilizable via radiation and certain grades can be steam autoclaved.

Extrusion Blow Molding

A molding process whereby heat-softened polymer is forced into the shape of a hollow tube. While still soft, a mold closes around the tube, pinching the top and bottom of the tube closed. A Blow Pin is introduced and air is forced through the pin forcing the tube to take the shape of the Blow Mold cavity.


The part of the bottle or vial that holds the cap, stopper or closure. This part of the finish, whether a serum or screw thread, is commonly called the “T” dimension.

Injection Blow Molding

A molding process in which heat-softened polymer is injected from a Plastifier into a mold cavity creating a Preform, which is then transferred to a Blow Mold where air is blown into the Preform, forcing it to take the shape of the Blow Mold cavity.

Injection Molding

A molding process whereby a heat-softened polymer is injected from a Plastifier into a relatively cool cavity, which gives the article the desired shape.

Injection Stretch Blow Molding

A molding process whereby preforms are introduced into a cavity, stretched axially by a Stretch Rod and then blown circumferentially to the shape of the Blow Mold cavity.

High Density Polyethylene (HDPE)

Flexible but more rigid than LDPE. Natural color is milky white, semi-translucent depending on density. Good impact strength and stress crack resistance. Good chemical resistance. Good vapor barrier but poor gas barrier properties. Sterilizable via Ethylene Oxide or Gamma radiation.

Linear Coefficient of Expansion

The fractional change in length of a piece of glass per degree change in temperature. The coefficient of expansion generally indicates the thermal endurance of the glass. Glasses with low linear coefficient of expansion are more resistant to thermal shock than glasses with a high coefficient of expansion.

Low Density Polyethylene (LDPE)

Very flexible, natural milky color, translucent with high impact strength. Excellent for mild and strong buffers, good chemical resistance. Good water vapor and alcohol barrier properties. Poor gas barrier properties, sterilizable with ethylene oxide or gamma radiation. Good stress crack resistance.

Polyethylene Terephthalate (PET)

Semi-rigid to rigid depending on wall thickness. Natural color – clear and transparent. Good alcohol and solvent barrier; good gas and fair moisture barrier. Good to fair chemical barrier; not good for strong acids or bases. Good moldability. Sterilizable through ethylene oxide or gamma radiation. Good stress crack and impact resistance at room temperature and above.

Polypropylene (PP)

Rigid, solid and durable in container or cap forms. Excellent stress crack and impact resistance. Excellent moisture barrier, good oil and alcohol barrier, poor gas barrier properties. Good chemical resistance. Sterilizable with ethylene oxide or autoclaving.

USP Type I, Class A

USP Type I classification refers to borosilicate glass with superior chemical resistance representing the least reactive glass containers available. Type I glass may be used to package acidic, neutral and alkaline products, as well as water for injection, un-buffered products, chemicals, sensitive lab samples and those requiring sterilization. Type I glass can be subject to chemical attack under certain conditions including very low and very high pH applications.


USP Type III is a soda lime glass with moderate chemical resistance used primarily for general storage applications. Type III glass may not be suitable for autoclaved products because the autoclaving process will accelerate the glass corrosion reaction. Dry heat sterilization is not a problem for these containers.