Material Characteristics
Compound General Characteristics Applications Normal Hot @400 F Code
HWK 349 A rigid molded, medium coefficient material.  The Exhibits good strength.  It is recommended for use in 0.39 0.43 .47 FF
material is available in flat slabs or other flat shapes light to medium duty gear tooth facings or notched
drivers.  HWK 349 may be used in dry or wet
applications.
HWK 392 Rigid molded, medium high coefficient material.  The A general purpose material recommended for light to 0.43 0.36 .44 FF
material has good friction stability, fade resistance medium duty use in band and shoe applications.  It is
and recovery also supplied in flat fully cured slabs abs.
HWK 412 Rigid molded, medium coefficient material.  It has Good dimensional stability allowing it to be molded to 0.35 0.34 .36 EE
` exceptional friction stability and fade resistance size and is easily machined.  It is also supplied in flat
fully cured slabs.  HWK 412 has been successfully
used in applications such as automotive disc pads and
industrial pads, pucks and rings.
HWK 431 A premium rigid molded medium coefficient, heavy Exhibits excellent fade resistance and friction 0.34 0.33 .35 EE
duty semi metallic material.  The dark gray stability, making it a good choice for internally molded for integrally molded
material exhibits very high compressive strengths. disc brakes and blocks.
HWK 443 Rigid molded, high coefficient material.  It is a versatile Good dimensional stability allowing it to be machined 0.57 0.49 .55 HG
material for industrial use It is also supplied in flat fully cured slabs.  HWK 443
has been successfully used in applications such as
press brakes, misc. rings, and other disc brake
applications
HWK 449 A rigid molded, ;high coefficient material.  The material Recommended for use against softer mating surfaces 0.51 0.51 .54 GG
has excellent friction stability and wear resistance such as copper.  copper, commonly used in water cooled brakes
and clutches, flat slabs, arced segments mold to shape
HWK 453 A rigid molded, high coefficient material with brass Good dimensional stability allowing it to be molded 0.57 0.49 .55 HG
chips.  It is a versatile material for industrial use. to size and is easily machined.  It is also supplied in
flat, fully cured slabs.  HWK 453 has been successfully
used in applications such as press brakes, misc. rings, facings, and other disc brake applications. misc.
rings, facings, and other disc brake applications
HWK 549 Rigid molded, medium low coefficient material.  The Recommended for use against softer mating surfaces 0.20 0.18 .22 DD
material has excellent friction stability and wear such as copper or aluminum.  The material can be
resistance supplied in flat slabs, arced segments, or molded to
shape.  This lower coefficient material is typically used
in applications with copper for tensioning situations.
HWK 603 Rigid molded medium high coefficient material.  It is HWK 629 is recommended for use in drum linings. 0.48 0.47 .47 GG
supplied in segments or slabs.  HWK 629 has excellent HWK 603 has It has been especially successful in medium to heavy
excellent fade and recovery characteristics and trucks
coefficient stability
HWK 629 A rigid molded, medium-high coefficient material.  It is A general, multipurpose material recommended for use 0.42 0.43 .42 FF
supplied in segments or slabs.  HWK-629 has in dry bands, shoe applications, and other miscellaneous
excellent fade and recovery characteristics and parts.
coefficient stability.
HWK 643 Rigid molded, medium-high coefficient material.  The Exceptional dimensional stability allowing it to be 0.38 0.37 .39 FF
reddish brown material has excellent strength molded into intricate shapes.  It is used extensively in
characteristics. gear tooth applications of all duties.  Hawkhead gear
tooth rings are precision molded to insure tensile
strength and uniformity in production.
HWK 649 Rigid molded, non metallic, medium high coefficient Off road band brake applications 0.46 0.46 .47 GG
material.  The material has a high cold static and a
very stable dynamic coefficient at all temperatures
HWK 692 Rigid molded, medium high coefficient material.  The HWK 692 has exceptional dimensional stability 0.37 0.37 .51 FF
material has excellent strength characteristics allowing it to be molded into intricate shapes.  It is
used extensively in gear tooth applications of all
duties.  Hawkhead gear tooth rings are precision
molded to insure tensile strength and uniformity
in production `
HWK 729 Rigid molded, medium high coefficient material.  It is A heavy duty, multipurpose material recommended 0.44 0.45 .44 FF
supplied in segments or slabs.  HWK 729 has for use in industrial and other off road applications.  The
excellent fade and recovery characteristics and material exhibits superior strength and rigidity
coefficient stability compared to other general use offerings.
HWK 829 ` Rigid molded material designed for wet applications Wet band brake applications.  The material is not (Dynamic) (Static) N/A
only designed for dry applications 0.08 0.15
HWK 833 Rigid molded high coefficient material.  The material Applications include automotive and industrial 0.51 0.50 .54 GG
has excellent friction stability and fade resistance integrally molded disc pads
HWK 929 A rigid molded, medium high coefficient material.  The Designed for intricate shapes due to exceptional 0.45 0.40 .43 FF
material has excellent strength characteristics and dimensional stability.  It is also supplied in flat fully
wear. cured slabs.  HWK 929 has been successfully used
in applications such as press brakes and other
disc brake applications
HWK 2000 Is a heavy duty composite woven from yarns containing Suitable for light to heavy duty service with steel and 0.53 0.53 .56 GG
brass wire. This dense, tough material exhibits load. dimensional stability.  cast iron mating surfaces. It is
Has a excellent fade and recovery stability.   also suitable for light to medium duty operation in oil.
Applications include winches, cranes, hoists and heavy
duty industrial.
HWK 3000 A Flexible molded lining available in a roll form. It is Is suitable for light to medium duty in dry applications. 0.47 0.47 .47 GG
lining becomes firm with final curing. It has excellent They include shoe brakes, bands and other industrial
fade and recovery stability and good rivet strength in applications.
both it's semi-cured and cured states.