OCF: One-Component Foam. (See SINGLE-COMPONENT FOAM.)
ocSPF: Open-cell SPF. (See LOW-DENSITY SPF INSULATION.)
OFF-GASSING: See OUTGASSING.
OFF-RATIO FOAM: An off-ratio foam is caused by a deficiency of one of the component chemicals (A- or B-side) during application. The reaction of an off-ratio foam is readily visible to the trained SPF applicator. Off-ratio foam will negatively affect SPF yield, performance, and worker safety.
ONE-COMPONENT FOAM: See SINGLE-COMPONENT FOAM.
OPEN-CELL SPF: See LOW-DENSITY SPF INSULATION.
OPTICAL COMPARATOR: An eyepiece with magnification ranging from 4–12 power, with a scale used for measuring thickness.
ORANGE PEEL SURFACE TEXTURE: The surface texture of SPF, which exhibits a fine granular texture and is compared to the exterior skin of an orange. This surface is considered acceptable for receiving a protective coating. This surface requires at least 10% additional coating material to the theoretical amount. (See SPFA-145, “Surface Texture of Spray Polyurethane Foam.”)
ORGANIC: Compounds containing carbon.
ORIFICE: An opening or aperture. The opening in the tip of a spray gun.
OUTGASSING: The slow release of a gas that was trapped, frozen, absorbed, or adsorbed in some material. Sometimes called “off-gassing,” particularly when in reference to indoor air quality.
OVERSPRAY: (1) Airborne spray loss of polyurethane foam or coatings. (2) Undesirable depositions of airborne spray loss.OVERSPRAY SURFACE TEXTURE: The surface shows a linear coarse textured pattern and/or a pebbled surface. This surface is generally downwind of the sprayed polyurethane path and is unacceptable for proper coating coverage and protection, if severe.