|
GP - General Purpose Natural PTFE Liner
Purpose - Corroflon GP,SS is the general purpose grade of hose and has been carefully designed to satisfy the widest range of application requirements.
Design - The hose liner is manufactured from hose quality grade PTFE conforming to FDA requirements 21 CFR 177.1550 and USP Class VI, extruded in to tube and helically convoluted. It also includes a heavy gauge Grade 304 stainless steel reinforcing wire helically wound into the external root of the convolutions to strengthen the convoluted shape. The braid is high tensile grade 304 stainless steel wire braid to give maximum protection to the hose against internal pressure and external abrasion.
AS - Anti Static PTFE Liner
Purpose - Corroflon AS grade is an essential requirement in applications where there is the risk of an electrostatic build up on the inside of the PTFE tube which may then discharge through the tube wall, creating a leak. Media passing through which create such a risk are fluids which have a Conductance of less than 10-8 S/m (Siemens per Metre), or 104 pS/m such as fuels, solvents, freons, some WFI (ultra-pure "Water for Injection") and non-polar organics which are being transferred at a medium to high flow velocity.
All twin or multi phase media, and any non-mixing media, such as powder in air, or water droplets in steam, in gases or in oil, also colloidal fluids constitute a particular hazard for static charge generation, and always require grade AS.
A typical example involves cleaning systems which create a twin phase mixture passing through the hose at high velocity, such as WFI water purged out with air or nitrogen.
If in any doubt, please contact Aflex Hose.
Design & Approvals - Corroflon AS grade has an anti static PTFE liner manufactured from FDA approved PTFE, and less than 2.5% of "high purity" Carbon Black material to FDA requirement 21 CFR 178.3297. The carbon is encapsulated by the PTFE and in normal, non abrasive applications will not come loose to contaminate any fluid passing through. Corroflon AS hose liner tube also conforms to:
USP Class 6:
- Systemic Injection Test
- Intracutaneous Test
- Intramuscular Test
- USP L929 MEM Elution Test (Cytotoxicity)
Specifications - When "AS" (Antistatic) grade hose is specified, then the hose supplied will be in accordance with the requirements of BS5958 Part 2, 1991 Clause 19.3, when tested in accordance with EN ISO 8031 Clause 3.1, which requires that the resistance between a plug inserted 25mm into the bore at the end of the hose assembly, and one of the metallic end fittings should be less than 108 ohms.
NOTE: When in service, at least one end fitting must be connected to earth to permit dissipation of the static charge from the end fitting.
SP - Special Purpose Liner
Purpose - For application requiring a higher temperature/pressure rating, greater flexibility and improved kink and crush resistance. Also for applications requiring full vacuum resistance for hose sizes larger than 2".
Design - The convolutions are closer together, yielding greater radial strength to the hose design.
Specifications - As for Corroflon GP, except that the maximum working pressure for wire braided grades is increased by 25%, the weight per metre is increased by 30%, the actual through bore is reduced by 50%, the minimum bend radius is reduced by 25% and the angle of cleanability is <80°.
Available as SP (Natural) and SP,AS (Antistatic) Grades.
EC - Electrical Continuity - When EC grade is requested, it is necessary that the hose assembly supplied is electrically continuous, or conductive, between metal end fitting at each end of the hose.
The requirements for this are specified in the German Document BRG132, and the Specification EN ISO 12115, tested to EN ISO 8031 Clause 3.7, which requires that for hose assemblies with a resistance between fittings of £ 102 ohms, a letter "M" can be applied, or £ 106 ohms, a letter "Ω" can be applied.
Braided Corroflon Hose Assemblies all meet the requirements of both "M" and "Ω".
The only exception is for assemblies without braid. Grade AS,TO (Antistatic, Tube Only) meets the requirements of "Ω", £ 106 ohms, but Grade GP,TO (Natural Tube Only) does not meet either "M" or "Ω"
|
