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A chemical or substance used to help facilitate the flow of solder. Can be applied before the wave soldering process and after cleaning.

A soft, cushiony material formed by creating bubbles in base material, such as natural or synthetic rubbers, or other elastomeric materials.

Adhesives meeting specified sections of the Food & Drug Administration Code of Federal Regulations. These regulations cover direct food labeling as well as incidental contact. Special product recommendation are necessary for specific applications.

A hardening or crystalizing of the adhesive after application so that tape cannot be removed easily or cleanly.

Openings between layers of tape within a roll.

See Offsetting.

A kraft paper, which is highly calendered, so that it is smoother and more dense than SCK.

A subjective term used to describe the relative amount and nature of mirrorlike (SPECULAR) reflection. Different types of gloss are known as sheen, distinctness-of-image gloss, etc. Terms widely used ar: FLAT (or MATTE)-practically free from sheen, even when viewed from oblique angles; EGGSHELL-semi-gloss; FULL GLOSS-smooth and mirrorlike surface when viewed from all angles. Instruments known as glossmeters are available to measure gloss from three different angles: 20, 60, and 85 degrees from normal. Gloss is measured against an arbitrary scale of 1000 for a perfect mirror. Polished plate glass has a gloss value of 100 on that scale. ASTM has developed a variety of test methods for testing gloss levels of many different coatings and materials.

The machine direction of paper as opposed to the cross direction. Also, a measurement of pressure-sensitive adhesive on a given area.