Polyamide 6.6(or
Nylon 6.6) is a resin belonging to the Nylon
family of thermoplastic mounding materials.
Polyamide
6.6 possesses a good balance of various properties :- tensile and
flexural strengths ,allowable service temperature, impact resistance,
abrasion resistance, resistance to fuels, lubricants and many
chemicals(except strong acids and oxidizing agents).It has good
electrical properties ,for low voltage applications. It is resistance to
surface discharge with CTI > 600(IEC-60112).
Screw Clamp (steel) Contact clamp :
Elmex Screw clamp consists
of a U-shaped steel part ,called contact clamp and a washer base or
cheese head screw.
The
vertical arms of the contact clamps are folded at the top end into lips,
overlapping each other. The lip from each arm locks into recess provided
on the other arm. This double locking is an outstanding feature of elmex
screw clamp design, which allows tightening torques in excess of the
values specified by the standards. In addition, in the event of
inadvertent over tightening,this design prevents damage to the threads
and deformation of contact clamps.
The button face of the ‘U’ has
serrations, which grips the conductor firmly during tightening. The lips
are drilled and threaded coaxially in a special machine to produce
rolled threads for higher mechanical strength of threads which can take
higher tightening torque.
The Contact clamp undergoes
Heat Treatment for increased hardness and strength. It is then Zinc
plated and passivated to a higher degree of plating thickness than
usually adopted. elmex screw clamps therefore have a
very good resistance to normal atmospheric corrosion.
Heat Treatment: elmex
contact clamps are subjected to a special heat treatment process
ensuring uniformity of temperature over the entire clamp surface and
consistent results of heat treatment so that the inner threads of the
clamp achieve a uniform and strong wear resistance.
Camping
Screws:
elmex
Screw-Clamps uses cold-forged rolled-threaded washer-base or cheese-head
screws (or Phillips-head screws in specific cases). The screws are
hardened and tempered for increased strength and wear resistance. After
first assembly they become captive a circular ring provided in the
housing for cheese head screws. These screws are corrosion-protected by
zinc plating and passivated to a higher degree of plating thickness,
under controlled plating process. The screws have a flat bottom which
creates a balanced pressure on current bar for conductor-clamping
Screw
Clamp –(copper-alloy)
In
the elmex design of copper alloy terminal blocks, the steel screw-clamp
is replaced by copper-alloy screw-clamp protection against atmospheric
corrosion of copper-alloy is achieved by tin plating to a higher degree
of plating thickness, in a controlled plating process. The tin plating
has under-coat of nickel plating to prevent zinc migration.
By appropriate
selection of materials and processes, the phenomenon of the stress
corrosion cracking is taken care of in elmex copper-alloy screw clamp.
The clamping
part in elmex screw clamp is of special design, such
that as the conductor clamping is achieved by tightening of screw, the
top-portion bends elastically, so that screw threads are gripped to
prevent loosening.
Current Bar
elmex
current bars are made of electrotytic copper or a high quality copper
alloy and tin plated with higher than usual plating thickness, to
maintain the contact surface free from atmospheric corrosion. Nickel
under coat prevents zinc migration in case of copper alloy current bars
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Last modified: 10/20/11
Polyamide
6.6 possesses a good balance of various properties :- tensile and
flexural strengths ,allowable service temperature, impact resistance,
abrasion resistance, resistance to fuels, lubricants and many
chemicals(except strong acids and oxidizing agents).It has good
electrical properties ,for low voltage applications. It is resistance to
surface discharge with CTI > 600(IEC-60112). 
The
vertical arms of the contact clamps are folded at the top end into lips,
overlapping each other. The lip from each arm locks into recess provided
on the other arm. This double locking is an outstanding feature of elmex
screw clamp design, which allows tightening torques in excess of the
values specified by the standards. In addition, in the event of
inadvertent over tightening,this design prevents damage to the threads
and deformation of contact clamps. 
elmex
Screw-Clamps uses cold-forged rolled-threaded washer-base or cheese-head
screws (or Phillips-head screws in specific cases). The screws are
hardened and tempered for increased strength and wear resistance. After
first assembly they become captive a circular ring provided in the
housing for cheese head screws. These screws are corrosion-protected by
zinc plating and passivated to a higher degree of plating thickness,
under controlled plating process. The screws have a flat bottom which
creates a balanced pressure on current bar for conductor-clamping
In
the elmex design of copper alloy terminal blocks, the steel screw-clamp
is replaced by copper-alloy screw-clamp protection against atmospheric
corrosion of copper-alloy is achieved by tin plating to a higher degree
of plating thickness, in a controlled plating process. The tin plating
has under-coat of nickel plating to prevent zinc migration.
elmex
current bars are made of electrotytic copper or a high quality copper
alloy and tin plated with higher than usual plating thickness, to
maintain the contact surface free from atmospheric corrosion. Nickel
under coat prevents zinc migration in case of copper alloy current bars