Corner bone/dogbone (glass fiber composited with polyester resin )
with certificate of UL/ROHS/REACH
Corner bone and dogbone are the pultrusion material which were
produced by mold .The raw materials are polyester resin and glass
fiber roving . Fiberglass roving were impregnated in polyester
resin ( added some filler materials in polyester resin) , and then
pultrusion under high temperature and pressure .It is the glass
reinforced thermoset polyester material and will became the solid
material while temperature rise up .
We have so many sizes of options by clients , such as
8*8/10*10/12*12/16*16mm (total more than 20 kinds of the size ) and
the length can be customized by clients , it will be very
convenience for making parts of clients .
Corner bone with very excellent properties on Electric/ mechanical
properties, it is very strong, dimensionally stable and impact
resistant of mechanical properties .No cracking when assemble in
electric equipment. At the same time ,it has so many advantages on
properties , such as good properties on flame, arc and track
The material has certified by ROHS/REACH for meeting environmental
To meet the requirement for exporting to Europe and North America ,
the produce has certificated by UL.
At present ,this materials have been exporting to so many
transformers manufacturers in Asia and Europe and total more than
20 countries .
Feature of dogbone and corner bone
It is the environmental protection material , very little effect to
the environmental when running in electrical equipment.
It is halogen free product and green products , meet ROHS and Reach
requirement and no effect to the human bodies .
It can be customized produce as per client’s requirement .
Very stable of the strength such as tensile & bending when
running on high or low temperatures , no cracking .
It is the fire resistance material and low smoke material .
Very excellent properties on arc (more than 180s) and CTI meet
Application of material
Dogbone and corner bone with very good properties when working
temperature below zero degree centigrade,we have the clients who
was running projects in Qinghai-Tibet Railway , the temperature
will below -55℃ in winter .However , the material will keep the
excellent electric and mechanical properties in this extreme
These properties were tested by the third party which is one of the
most famous Accredited Testing Organization in China.
This material can be machined parts such as drill the holes by CNC
machines . In addition ,the material with the excellent electric
properties , especially excellent anti Comparative Tracking .As we
known , voltaic arc caused carbonization on surface of material ,
and the carbonization will affect to the insulating property , this
material will reach more than 180 seconds of arc voltaic.
Corner bone produced by polyester resin and glass fiber is widely
used in area of transformers . reactor , large dry type
transformers and etc., researching and development of the
application characteristics of airway stay pultrusion products .
With the advantage in the process of foil or wire wound around the
stability of bracing structure and non-cracking .
with the Environmental protection concept enjoy popular support ,
more and more electric equipment manufacturers will be choosing
green products to produce the electric product , ROHS/REACH
certified material meet this requirement .