Glass: A Pocket Dictionary Of Terms Commonly Used - Corning ...

perature of about 2450°F (1400°C). This is followed by a
maturing period, during which the molten glass cools
to a working temperature of about 2000°F (1100°C).
Free-blown (off-hand blown) glass: Glassware shaped
solely by inflation with a blowpipe and manipulation
with tools.
Frigger: The English term for an object made by a
glassworker on his own time. Most friggers were made
from the molten glass that remained in the pot at the
end of the day. such glass was considered to be a worker’s
perquisite. American glassworkers referred to friggers
as “end-of-day” objects. They are also known as
whimsies.
Frit, fritting: Batch ingredients such as sand and alkali,
which have been partly reacted by heating but not
completely melted. After cooling, frit is ground to a
powder and melted. Fritting (or sintering) is the process
of making frit.
Frosting: (1) A matte finish produced by exposing the
object to fumes of hydrofluoric acid; (2) a network of
small surface cracks caused by weathering.
Full-size mold: See Mold.
Furnace: An enclosed structure for the production and
application of heat. in glassmaking, furnaces are used
for melting the batch, maintaining pots of glass in a
molten state, and reheating partly formed objects at
the glory hole.
Fusing: (1) The process of founding or melting the
batch; (2) heating pieces of glass in a kiln or furnace
until they bond (see Casting and Kiln forming); (3)
heating enameled glasses until the enamel bonds with
the surface of the object.
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