Watson-Marlow SP40 - Manual (Page 19)

DESCRIPTION
16
4.6 Pump hose
4.6.1 General
The pump hose is made of special rubbers, reinforced
with nylon cords and is constructed as follows:
A:
Outer extruded layer made of natural rubber
B: Nylon reinforcement layers
C: Inner extruded liner
The pump hose liner material should be chemically
resistant with the product to be pumped. Dependent on
the specific requirements of your application a
corresponding pump hose must be selected. For each
pump model various hose types are available.
The material of the inner liner of the pump hose
determines the hose type. Each hose type is marked by
a unique color code.
A
C B
Hose type Material Colour code
NR Natural rubber Purple
NBR Nitrile rubber Yellow
F-NBR Nitrile rubber Yellow
EPDM EPDM Red
CSM CSM Blue
Bioprene Bioprene Light green
Consult your Bredel representative for
more detailed information about the
chemical and temperature resistance of
pump hoses.