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Nitrile
rubber (NBR) is a copolymer of acrylonitrile and
butadiene. It is highly recommended when oil
resistance is required for the proper functioning
of rubber parts.
Nancar NBR is highly recommended for use in the
following applications:
1.
Industrial and automotive goods
2.
Belting and fuel hose
3.
Injection molded goods
4.
Footwear
5.
Spinning cot and apron
6.
Insulation and sponge-type sporting goods
7.
Rice roller
8.
Adhesives
9.
etc.
There
are a variety of grades currently available.
Apart from regular grades, Nantex has, over the
years, developed other faster curing grades that
offer:
1.
Faster curing
2.
Low mold fouling
3.
Improved processability
4.
Superier resilience properties
There
are also specialty grades such as the carboxylated
nitrile, the nitrile-PVC polyblend,
nitrile-PVC-DOP polyblend, and DOP-plasticized
grade.
Nancar
nitrile rubbers are available in a wide variety of
acrylonitrile contents (ACN content) and mooney
viscosities (MV) for optimum performance in a
variety of conditions. The ACN content and MV are
general criteria for grade selection. Some
special requirements may also be in order.
A.
ACN - CONTENT
Acrylonitrile
content is the main indicator of oil and fuel
resistance in nitrile rubber.
As it increases, fuel and oil resistance,
represented by volume change in this graph, is
improved. On
the other hand, as acrylonitrile content is
lowered, low temperature resistance is improved.
B.
MOONEY VISCOSITY
The
type of mixing and molding equipment used
determines to an extent the level of mooney
viscosity that will be most suitable.
The
versatile general purpose grades with mooney
viscosities from 45 to 60 can be processed either
by banbury, kneader or open mill using
compression, transfer, extrusion or injection.
To provide you with an idea on the suitable
mooney viscosities for particular mixing and
molding equipment, the following chart should
prove helpful.
|
Mooney
Viscosity
ML
1+4@100oC
Processing
|
75
- 90
|
60
- 75
|
45
- 60
|
25
- 45
|
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Mixing
Equipment
|
Banbury
|
Banbury
Kneader
|
Banbury
Kneader
Open
Mill
|
Kneader
Open
Mill
|
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Molding
Equipment
|
Compression
|
Compression
Transfer
Extrusion
|
Compression
Transfer
Extrusion
Injection
|
Transfer
Extrusion
Injection
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C.
Special requirements
Your
needs may require that your product has high abrasion
resistance.
In this case, our Nancar has carboxylated grades may be
suitable to meet your needs.
When improved ozone resistance is required, Nancar has
NBR/PVC polyblend grades to meet this specific need.
On the other hand, When low durometer is what is
required, Nantex has an offering for a DOP-plasticized grade.
To
get an even better view of our various NBR grades, click the
GRADE SUMMARY icon, and check out our Nancar NBR Grade
Summary.
By clicking on the NBR LIST icon, you may also want to
check out our Nancar NBR Grade List and get a glimpse of the
various applications of our Nancar NBR.
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