Product Traceability, Inspection and Testing

CRP became one of the first companies to be accredited to ISO 9001 in 1992 and has maintained this since, now to ISO9001:2015.
All of our manufacturing processes and test procedures fall within this regime.
All products are designed and manufactured to comply to the Pressure equipment directive and are CE marked where applicable.
Our two principal lining procedures involve paste extruded PTFE and PFA moulded components.
 

PTFE Lined Products

All PTFE is purchased directly from global manufacturers, each batch of PTFE has its own unique number. We never mix these batches together, all our PTFE tube extrusions contain only one batch. When the polymer is mixed and extruded the batch number is recorded on the extrusion details sheet, this extrusion run number is referenced on a label applied to the PTFE tube once sintered.

 
PTFE Testing
All our testing meets the requirements specified in ASTM F423. PTFE tubing is tested from each sintering run, tests include visual, dimensional, specific gravity and tensile tests.
 
 
All these test results are noted on the extrusion details sheet and held securely by CRP. 
 

 
Hard Stamping
As the steelwork is lined the PTFE extrusion number of the liner used is hard stamped on the steelwork so that this can be cross-referenced to the extrusion details sheet, giving full traceability from the lined component back to the PTFE polymer batch used.
 
Electrostatic Testing
The PTFE lined spool is subjected to a electrostatic spark test at 25kV to ensure the integrity of the liner.
 
Hydrostatic Testing
Blank flanges are bolted on to the spool piece and the spool subjected to a hydrostatic pressure test of 29 bar G for 3 minutes, then the pressure is reduced to atmospheric before being subjected to another 3 minute pressure test.

PFA Lined Products

Polymer batch numbers are linked to the manufacturers material certificate Discrete batches of polymer are not mixed. The batch number of the polymer used is recorded on the moulding log sheet against a specific mould reference.

 
PFA Testing
The PFA we use meets the requirements of ASTM D3307 Type 2. They are also specified as having a restricted melt flow index not exceeding 3 grammes in 10 minutes.
We extensively use our own in house melt flow indexing test equipment to ensure the PFA complies to our strict quality controls.
Hard Stamping
The steelwork of the moulded component is hard stamped with the unique mould reference. This can then be used to cross reference back to the original manufacturers polymer batch used to line the component.
Electrostatic Testing
The PFA moulded component is subjected to a electrostatic spark test at 25kV to ensure the integrity of the liner.
Hydrostatic Testing
Blank flanges are bolted on to the fitting and then it is subjected to a hydrostatic pressure test of 29 bar G for 3 minutes, then the pressure is reduced to atmospheric before being subjected to a further 3 minute pressure test.

Contact Details

Corrosion Resistant Products Ltd
Todmorden Road
Littleborough
OL15 9EG

Phone: +44(0)1706 756400
Fax: +44(0)1706 379567
Email: