Full Wax (W). Full wax treatment is generally used on wide mouth ì closures as a caulking agent. It is difficult for many liner ì facings to provide a satisfactory seal on wide mouth containers. ì The larger the finish, the greater the tolerance in both ì container and finish. Inherent waves and dips in large finishes ì also contribute to this condition. The full wax treatment is ì generally suggested for closures 58mm and above, primarily as a ì sealing aid. It also provides an additional moisture barrier and ì acts as a lubricant similar to the LW and LF coating treatments.
> Ask about W (Full Wax)

The central portion of a container which has a smaller cross-section than the adjacent areas.
> Ask about Waist

Warehousing services are available.
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A general defect. A series of horizontal waves or folds on the side of the bottle.
> Ask about Wash Board

The property of a material that permits water vapor to pass through its structure. This property has measurable values that can be determined under specified conditions of time, temperature and the water vapor pressure differential between two sides of a material or between two sides of material or between the inside and the outside of a container.
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A general defect. Irregular surface on either the inside or outside of the container.
> Ask about Wavy Appearance

Wax is widely used as a component of liner facings and serves ì three principal functions: 1) Lubricates the facing. This prevents excessive adherence to ì the glass or plastic finish, which may cause closures to be ì difficult to remove. 2) Reduces vapor transmission. Many dry products are packaged ì using liners, which depend on wax entirely as the vapor barrier. 3) Acts as a caulking agent. On widemouth containers, the wax ì helps to compensate for surface variations in the container ì finish.
> Ask about Wax Coatings

A closure for a container in which there is an interior recessed opening into which an applicator may be affixed.
> Ask about Well Cap

A filling or compounding room where extreme measures are taken to assure product cleanliness. Also called clean room.
> Ask about White Room

A SANCAP Liner Technology product. A melamine/ureaformaldehyde ì coating on white paper. White Silite is a bleached Kraft paper coated on one side with a ì melamine-urea-formaldehyde resin. Color: White. Suggested product uses include cooking oil, food and medicinal ì syrups, toothpaste, shaving cream, oil of wintergreen, cleaning ì fluid, household ammonia and liquid starch.
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White Lined Pulpboard. A backing material to which facings are laminated in the ì manufacture of duplex liners. It is pulpboard that has a white ì lining on one side. Pulpboard is made up of virgin and reclaimed ì fibers. It is available in most thicknesses or specified by the ì customer.
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Wide mouth describes any container having an opening roughly half of the diameter of the container to almost the full diameter size of the container.
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A finish on a container, the diameter of the finish being large relative to the diameter of the body.
> Ask about Wide Mouth Finish

A finish defect. A finish which has excessive glass projecting upward from the inside edge of the finish (similar to an overpress) except that it does not extend above the sealing surface. It is sharp and could chip.
> Ask about Wire Edge

WLP is a backing material to which facings are laminated in the ì manufacture of duplex liners. It is pulpboard with a white paper ì facing and clay coating.
> Ask about WLP

A general defect. A large fold on the outside of the bottle. Also called "lap".
> Ask about Wrinkle

Water vapor transmission rate. The actual rate of water vapor transmission used to compare water vapor barrier, wrapping, or container materials. Usually expressed in grams of water passing through 1 square meter of material in 24 hours at 100 F and 90% relative humidity. Rate may also be expressed in different units as grams per 100 square inches per 24 hours, etc., or under different conditions of temperature and relative humidity.
> Ask about WVTR