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Glossary of Terms
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  Glossary of Common Terms


Abrasion resistance            Resistance of a material to abrasion.
Ambient Operating Temperature Temperature of the medium surronding an object; for example, a belt at room temperature.
Centerline circle Distance around the centerline of a belt, same as centerline circumference (figure 3).
Centerline circumference Distance around the centerline of a belt (figure 3).
Centerline diameter            Distance from cross sectional center of one side of a belt through center point to cross sectional center of belt on opposite side (round: figure 1), (flat: figure 2).
Circumference                    Distance around a circle (figure 3)  Belt circumference must be specified as inside, outside or centerline circumference.
Coefficient of Friction A term which represents the friction between two surfaces
Compression set                Difference between the thickness before compression and after compression, reported as % at duration and temperature.
Conductive                          Material will conduct.   Can refer to electricity, static electricity or heat.
Connectable belt                 Usually refers to a repair belt which is used to temporarily replace failed live roller conveyor belts   also known as a PC Belt (Pyramid’s Brand), quick fix, zero down time, twisted belt or band, temp belt or band as well as under other names.
Copolyester Elastomer Plastics with the combined strength and processing characteristics of engineering plastics with the performance of thermoset elastomers.
Cross section Describes the dimension across the outside of a belts section.  Round belts will have one dimension, if concentric, and flat belts will have both a thickness and a width and a width.
Cut length                            Length of a belt if it were cut and laid out straight (mathematically the same as centerline circumference or pitch circumference).
Diametape                           Flexible, graduated tape used for nondestructive measurement of inside diameter and inside circumference of round or flat belts.
Diameter                             Distance from one side of a circle through center point to opposite side of circle (round: figure 1), (flat: figure 2).
Dissipative                         Neither conductive nor insulative, but dissipates  Can refer to electricity, static electricity or heat.
Drive band                           Another name for belts used to transmit rotational driving force from a source to driven object.
Drive belt                             Belts used to transmit rotational driving force from a source to driven object.
Drive Shaft This could describe a motor shaft but more often is used to describe a shaft which receives rotational power from the motor via gears, chain or belts and then transmits or distributes that power to other devices or equipment.
Durometer                           Hardness of an elastomeric material, reported as a value on Shore A or Shore D scale.
Elastomeric                         Stretchable, compressible rubber-like material.
Elongation                            Distance a product a has been stretched, reported in %.
Flex fatigue                          Failure due to repeated flexing.
Free length Length of a belt when laid out straight and measured end to end  (equivalent to Pitch circumference or Centerline circumference).
Glass transition                   Temperature at which a material loses its glass-like properties and becomes elastic.
Hygroscopic                        Ability of a material to absorb moisture.
IC                                         Inside Circumference (figure 3).
ID                                         Inside Diameter (round: figure 1), (flat: figure 2).
Inside circle    Distance around the inside surface of a belt, same as inside circumference (figure 3).
Inside circumference          Distance around the inside surface of a belt (figure 3).
Inside diameter                   Distance from inside surface of a belt through the center point to opposite inside surface of the belt (round: figure 1), (flat: figure 2).
Insulative                             Material will not conduct. Can refer to electricity, static electricity or heat.
Modulus                               Elastic materials resistance to elongation (tension), reported in PSI.
Modulus decay                    Reduction of modulus (tension) over a given time, reported as % loss at duration or PSI loss at duration.
N.I.S.T. National Institute of Standards and Technology.
Non-conductive                   Material will not conduct. Can refer to electricity, static electricity or heat.
Non-reinforced belt             Elastic belt with no fiber reinforcement embodied within the body.
Non-supported belt             Elastic belt with no fiber reinforcement embodied within the body.
O-bands Name for a drive belt which is derived from the use of O-rings as makeshift drive belts, also known as O-belt, O-ring belt, O-ring drive belt, etc.
O-belt                                   Name for a drive belt which is derived from the use of O-rings as makeshift drive belts, also known as O-ring belt, O-ring drive belt, O-band, etc.
OC                                       Outside Circumference (figure 3).
OD                                       Outside Diameter (round: figure 1), (flat: figure 2).
O-ring                                  Elastomeric ring developed to be used as a seal to prevent fluid leakage and at times substituted for a drive belt.
O-ring belt                           Name for a drive belt which is derived from the use of O-rings as makeshift drive belts, also known as O-belt, O-ring drive belt, O-band, etc.
O-ring drive belt                  Name for a drive belt which is derived from the use of O-rings as makeshift drive belts, also known as O-belt, O-ring belt, O-band, etc.
Outside circle                      Distance around the outside surface of a circle or belt. Same as outside circumference.(figure 3)
Outside circumference       Distance around the outside surface of a circle or belt (figure 3).
Outside diameter                Distance from outside surface of a circle through the center point to opposite outside surface of the circle (round: figure 1), (flat: figure 2).
PC belt                                 Connectable repair belt manufactured by Pyramid Inc. which is used to temporarily replace failed live roller conveyor belts.
PD Pitch Diameter (round: figure 1), (flat: figure 2).
Pitch circumference           Distance around the centerline of a belt (figure 3).
Pitch diameter (belt)           Distance from cross sectional center of one side of a belt through center point to cross sectional center of belt on opposite side (round: figure 1), (flat: figure 2).
Pitch diameter (pulley)       Distance from cross sectional center of one side of a belt that will be used in pulley, through center point to cross sectional center of belt on opposite side (round: figure 1), (flat: figure 2).
Pitch length (application)    Distance around the center of the belt when installed on the application.
Pitch length (belt)                Distance around the center of the belt. Same as free length and centerline circumference.
Polyester based PU            Most commonly used polyurethane with excellent physical properties and moderate pricing.
Polyether based PU            Polyurethane with improved resistance to combinations of elevated temperatures and high humidity at somewhat higher pricing.
Polyurethane A high grade plastic with better abrasion, cut, impact, and tear resistance than rubber or many other plastics. Also known as Urethane.
PSI                                       Pounds per Square Inch of area.
PU                                        Abbreviation for polyurethane or urethane.
Pulley Wheel used to transmit power by means of a belt passing over its rim, usually within a groove.  Groove configurations vary depending upon type of belt used and include “v” bottom, round bottom (sometimes called u bottomed) or flat bottom (with or without flanges).
Pyrathane® Pyrathane® is Pyramid’s registered trade name for the polyurethane products offered.
Quick fix belt                       Usually refers to a repair belt which is used to temporarily replace failed live roller conveyor belts. Also known as a PC Belt (Pyramid’s Brand), quick fix, zero down time, twisted belt or band, temp belt or band as well as under other names.
Resins Viscous liquid materials capable of hardening.
RPM                                    Revolutions Per Minute.
Shore Durometer                Hardness of an elastomeric material, reported as a value on Shore A (softer) or Shore D (harder) scale.
Specific gravity                   Weight of item related to water, reported as a %.
Splice Joining two pieces, or ends of cord, together.
Tear strength                       Force required to propagate a tear in a direction perpendicular to the direction of elongation, reported in PSI.
Temp belt or band Usually refers to a repair belt which is used to temporarily replace failed belts. Also known as a PC Belt (Pyramid’s Brand), quick fix, zero down time, twisted belt or band as well as under other names.
Temporary belt or band Usually refers to a repair belt which is used to temporarily replace failed belts. Also known as a PC Belt (Pyramid’s Brand), quick fix, zero down time, twisted belt or band as well as under other names.
Tensile modulus                 Elastic materials resistance to elongation (tension), reported in PSI at a given elongation.
Tensile strength Force required to break an object by stretching, reported in PSI.
TPE                                      Thermoplastic Elastomer.
TPU                                     Thermoplastic Urethane.
Twisted belt or band Usually refers to a repair belt which is used to temporarily belts. Also known as a PC Belt (Pyramid’s Brand), quick fix, zero down time, temp belt or band as well as under other names.
Twisty Belt or band Usually refers to a repair belt which is used to temporarily belts. Also known as a PC Belt (Pyramid’s Brand), quick fix, zero down time, temp belt or band as well as under other names.
Ultimate elongation             Percentage an elastomeric product will stretch before rupturing (breaking).
Ultimate tensile strength    Force required to rupture (break) an object by stretching, reported in PSI.
Unreinforced belt                Elastic belt with no fiber reinforcement embodied within the body.
Unsupported belt                 Elastic belt with no fiber reinforcement embodied within the body.
Urethane Another term used for polyurethane.
Zero down time                   Usually refers to a repair belt which is used to temporarily replace failed live roller conveyor belts. Also known as a PC Belt (Pyramid’s Brand), quick fix, twisted belt or band, temp belt or band as well as under other names.


 
     
Pyramid Incorporated • 522 N 9th Ave E • PO Box 200 • Newton, IA 50208-0200