REXNORD - MARBETT - MCC
S224
Lt
L0
a
T
20 °C
Lt = L0 • [ 1 + a • (T
– 20 °C) ]
Technical information
Calculation of thermal
expansion
Material characteristics
= Inal lenght ( mm. )
= initial lenght ( mm. )
= coefIcient of linear expansion.
= operating temperature ( °C ).
= ambient temperature.
Example :
aguide having initial length ²0 = 1000 mm, coefIcient of linear expansion 2X10-4, and an operating
temperature of 70 °C, expands by :
²t = 1000 mm • [ 1 + 0,0002 • ( 70 °C - 20 °C ) ] = 1010 mm
Polyamide PA
• An extremely tough material with excellent dimensional stability even at relatively high temperatures • Good
resistance to chemical attack • ±nLammability : 94HB.
Reinforced polyamide PA FV
• This material offers improved ductile strength compared with PA polyamide, as well as improved rigidity and
dimensional stability • Operating temperatures can also be higher • ±nLammability : 94HB.
Polypropylene PP
• ±deal for use at high temperatures • High resistance to chemical attack • Reduced mechanical characteristics
• ±nLammability : 94HB.
Reinforced polypropylene PP FV
• This material offers better dimensional stability and rigidity than PP polypropylene as well as better mechanical
strength • ±nLammability : 94HB.
Polyethylene PE ( UHMWPE )
• This is the plastic material which is most suited to the manufacture of lateral guides subject to sliding contact,
thanks to an extremely low coefIcient of friction, excellent wear resistance and zero absorption ( important in
water lubricated applications ) • PE polyethylene also offers high resistance to chemical attack and good sound
absorbing qualities • ±nLammability : 94HB.
Polyethylene ULF ( UHMWPE + solid lubricant )
• Compared to polyethylene PE offers a reduced friction coefIcient, with a consequent higher wear resistance
• Do not leave traces on the container • ±nLammability : 94 HB.
Acetal POM
• Acetalic resins are among the strongest and most resistant thermoplastic materials known • The most important
characteristics of these materials are excellent ductile strength, impact resistance, rigidity, and dimensional
stability • These materials also resist humidity and attack by most chemical agents • The materials cannot be
used in continuous contact with steam or hot water at temperatures above 60° C • ±nLammability : 94 HB.
Acetal Rex LF
• This material conserves the same characteristics of POM acetalic • The addition of a self-lubricating agent,
however, gives an extremely low coefIcient of friction and excellent wear resistance • Rex ²F acetalic has the
same limitations as POM acetalic as far as continuous contact with hot water and steam are concerned
• ±nLammability : 94HB.
Austenitic stainless steel
• Austenitic stainless steel offering excellent corrosion and oxidation resistance • ±deal for the food industry,
dairy and cheese production, beer production, and the pharmaceutical industry • Austenitic stainless steel is cold
rolled and responsive to magnets.
Zinc plated steel
• Galvanically zinc coated steel • Galvanization thickness 7 microns.
Nickel plated brass
• Good resistance to chemicals • Humid and wet environments.