GENERAL DESCRIPTION

WEPA4-350 IS A PATCH FOR REPAIRING ION EXCHANGE PERFLUORINATED MEMBRANE.
THE BIG SIZE OF WEPA4-350 IS NECESSARY WHEN ON THE MEMBRANE THERE ARE MANY TEAR, TYPICALLY NEAR THE GASKET, WHERE THE MEMBRANE IS MORE STRESSED INSIDE THE ELECTROLYZER.
WITH WEPA4-350 IS POSSIBLE TO REPAIR THIS TEAR STEP BY STEP WITH A LITTLE BIT OVERLAP DURING THE WELDER OPERATION.
SOMETIME THIS PROCEDURE IS USED ALSO TO REINFORCE THE EXTERNAL PERIMETRAL OF THE MEMBRANE, TYPICALLY STRESSED DURING THE REASSEMBLE AND ASSEMBLING IN THE ELECTROLYZER.

ADVANTAGE

REPAIR EXTENDE TEAR
CATHODE SIDE MARKED

COMPOSITION KIT

- WEPA4-350 PN 128-783 NBR. 10 SHEET A4
PATCH SIZE : 210 mm x 297 mm

PATCH MATERIAL

DUPONT NAFION 350
PERFLUOROSULFONIC ACID CATION EXCHANGE MEMBRANE OF OUTSTANDING CHEMICAL RESISTANCE FOR A VARIETY OF ELECTROLITIC PROCESSES.
STRONGER FIBER REINFORCEMENT THAT 324 IT HAS OTHERWISE THE SAME COMPOSITION OF SULFONIC ACID POLIMER

PROPERTIES :

REINFORCEMENT: TEFLON
IONIC FORM: H+
RESISTANCE IN 0.6N KC1 AT 23: C 3.7 (O-cm)
WEIGHT CALIBER AT 20 C, 50% RH: 4.0 (g/dm )
LINEAR EXPANSION FROM 50% RH AT 23 C TO WATER, 23 , IN H+ FORM

MACHINE DIRECTION: 5 - 7 %
TRANSVERSE DIRECTION 6 - 8 %

WELDABLE MEMBRANE WITH WEPA4-350:
DUPONT MEMBRANE (APPROVED BY DUPONT)
ASAHI GLASS MEMBRANE (TESTED BY EUROPEAN BUILDING CONTRACTOR OF CHLORO ALKALI PLANT AND CHLORO ALKALI MANUFACTURER)
ASAHI CHEMICAL MEMBRANE (TESTED BY EUROPEAN BUILDING CONTRACTOR OF CHLORO ALKALI PLANT AND CHLORO ALKALI MANUFACTURER)

OPERATING PROCEDURE

FOR GOOD JOINING WITH WEPA4-350 AND CONSISTENTLY SAFE WORKING CONDITION, QUIVER LTD RACCOMANDED AS FOLLOWS:

OPEN THE VACUUM PUMP BEFORE WELDING TO PRESERVE THE OPERATOR HEALTH, A VACUUM SYSTEM PROVIDE TO ASPIRE OVER AND UNDER DIRECTLY FROM PATCH AREA AND TO COLLECT THE NOXIOUS HEAT FLUORINATED GASES DURING WELDING AND COOLING OPERATION.
CLEAN THE ZONE OF THE MEMBRANE TO BE REPAIRED AS DESCRIBED IN THE WELNY WELDER MAINTENANCE AND USE.
USE A MEMBRANE OR SCRAPS OF MEMBRANE OF THE SAME TYPE TO BE REPAIRED IN ORDER TO REACH THE RIGHT COMPROMISE BETWEEN THE NECESSARY PARAMETERS OF THE WELNY WELDING MACHINE.
WELDING TIME
COOLING TIME
WELDING PRESSURE
HEATING PLATE TEMPERATURE

WE RACCOMANDED TO CUT A STRIP OF WEPA4-350 AS FOLLOWS:

FOR HEATING-PLATE 40 x 40 mm : STRIP WIDTH 35 mm
FOR HEATING-PLATE 32 x 80 mm : STRIP WIDTH 27 mm

BESIDES TO PROTECTION THE MEMBRANE AND THE PATCH DURING THE WELDING OPERATION IS SOLELY NECESSARY TO LEAN A KAPTON'S SHEET WITH THE SIZE ABOUT 100 mm x 150 mm IN THE LOWER SIDE OF THE CENTERING PLATE, THAT WILL REMAIN IN THE POSITION BY THE SUCTION GENERATED FROM VACUUM PUMP.

INDICATIVE GUIDE PARAMETERS FOR EACH STEP

WELDING TIME FROM 2 TO 3 min'
COOLING TIME FROM 1 TO 2 min'
WELDING PRESSURE FROM 3 TO 4 bar
HEATING PLATE TEMPERATURE FROM 200 TO 350 C

THE ABOVE DESCRIBED VALUES ARE GIVEN AS A GUIDE ONLY BECAUSE IS NOT POSSIBLE TO DETERMINATE STANDARDIZED PARAMETERS FOR ALL THE MEMBRANES AS THESE DEPEND OF THE TYPE OF MEMBRANE, THE AMMOUNT OF WEAR, MOISTURE AND ROOM TEMPERATURE.

HENCE IT IS UP TO THE OPERATOR (BY CARRYING OUT SOME TESTES) TO OPTIMIZE THE PARAMETERS ON SCRAP MEMBRANES OR ON A SAMPLE IN ORDER TO ARCHIVE HIGH QUALITY JOINING.

AT THIS POINT YOU CAN PROCEEDE TO REPAIR YOUR MEMBRANES WITHOUT PROBLEMS AND WITH OPTIMUM RESULT.

OVERALL DIMENSION AND STORAGE OF KIT WEPA4

B0X DIMENSION : 230 x 320 x 15 mm
WEIGHT: 500 g

INDIVIDUALLY PROTECTED AD HERMETICALLY SEALED WITH POLYETHYLENE FILM.
WEPA4-350 PATCHS HAVE TO BE STORED UNDER CONDITION OF RELATIVE UMIDITY 60/80% AND TEMPERATURE FROM 16 TO 20 C.
THE KIT IS SUPPLIED IN A RUGGED AND PRATICAL CASE OF HIGH QUALITY WOOD WITH RELATIVE CATCH.