Do yourself a basic quality control
1) The rubber mixture
should not contain evident air bubbles.
Cut in half the rubber
product. If the product you cut appears internally any evident air bubble,
this means that the productive process was not effected in the right times
and with the appropriate conditions.
Therefore the particular does not answer to the minimal quality requisites.
connection between the rubber and the other material must be tightly bound.
Using the pliers bend
the rubber bonded product to opposite directions.
A bonded product manufactured with a quality attachment (adhesive) cannot
be torn from parts bound.
( The standard bonding capacity is around 20Kg,/CM2 )
If not so, it means it is an article not good manufactured.
parts must be galvanized appropriately.
Put the metal parts
to fresh air for a few days.
The evident oxidization will compromise, in the long run; the metallic
part will represent a problem when you will disassemble in case of maintenance
or substitution of the product.
connection between metal parts must be well united.
Using a common hammer
hit the point of the metal parts.
If the two metallic parts are split, you will meet the same problem also
on the equipment on which it will be placed, compromising the lasting
in time of this one.
Now after doing these simple tests, you will be able to attest if your
product is or not a good quality one.