A chemical reaction that introduces fluorine into a compound.
n. Symbol F
A pale-yellow, highly corrosive, poisonous, gaseous halogen element, the most
electronegative and most reactive of all the elements, used in a wide variety
of industrially important compounds. Atomic number 9; atomic weight 18.9984;
freezing point -219.62°C; melting point -223°C; boiling point -188.14°C;
specific gravity of liquid 1.108 (at boiling point); valence 1.
n. Abbr. HDPE
A strong, relatively opaque form of polyethylene having a dense structure with
few side branches off the main carbon backbone.
A tough, wear resistant plastic that combines an incredibly low coefficient
of friction with outstanding impact strength. This self-lubricating polymer
has excellent chemical resistance and a broad temperature range making it the
perfect choice for engineers in a variety of industries such as conveyor and
bulk material handling.
Sheets, rods, tubes, standard and custom profiles, cut-to-size
strips and blocks
Chute, hopper and truck bed liners
Wear strips and guide rails
Star wheels, sprockets and conveyor tracks
Bumpers and dock fenders
Bushings, bearings and rollers
n. Abbr. LDPE
A form of polyethylene having many side branches off the main carbon backbone
and a less closely packed structure than that of high-density polyethylene.
PlasticA plastic is made up principally of a binder together with
plasticizers, fillers, pigments, and other additives. The
binder gives a plastic its main characteristics and usually
its name. Thus, polyvinyl chloride is both the name of a
binder and the name of a plastic into which it is made. Binders
may be natural materials, e.g., cellulose derivatives, casein,
or milk protein, but are more commonly synthetic resins.
In either case, the binder materials consist of very long
chainlike molecules called polymers. Cellulose derivatives
are made from cellulose, a naturally occurring polymer; casein
is also a naturally occurring polymer. Synthetic resins are
polymerized, or built up, from small simple molecules called
monomers. Plasticizers are added to a binder to increase
flexibility and toughness. Fillers are added to improve particular
properties, e.g., hardness or resistance to shock. Pigments
are used to impart various colors. Virtually any desired
color or shape and many combinations of the properties of
hardness, durability, elasticity, and resistance to heat,
cold, and acid can be obtained in a plastic.
are two basic types of plastic: thermosetting, which cannot
be resoftened after being subjected to heat
and thermoplastic, which can be repeatedly softened and remolded
by heat and pressure. When heat and pressure are applied
to a thermoplastic binder, the chainlike polymers slide past
each other, giving the material “plasticity.” However,
when heat and pressure are initially applied to a thermosetting
binder, the molecular chains become cross-linked, thus preventing
any slippage if heat and pressure are reapplied
produced by the polymerization of propylene, a relatively
inexpensive olefin derived from petroleum. The use of polypropylene
has expanded through the years due to its high strength
to weight ratio, excellent resistance to corrosion, ease
of fabrication, and low cost.
polypropylene belongs to the olefin family, it is quite
different in properties to other polyolefins. It has a
low density, is fairly rigid, has a heat distortion temperature
of 150 degrees F to 200 degrees F, and has excellent chemical
resistance. Additionally, polypropylene has negligible
water absorption, excellent electrical properties, and
is easy to process.
characteristics are its' resistance to strong acids, even
at elevated temperatures. A limitation of homopolymer polypropylene
is brittleness when exposed to freezing temperatures. Should
the features of polypropylene still be desirable, a copolymer
polypropylene should be used. As with all polyolefins,
polypropylene will burn readily. If fire resistance is
required, a special flame retardant polypropylene is available.