Gravimetric analysis samples require filters to be weighed both before and after sampling to determine the amount of contaminate collected. Zefon pre-weighed cassettes eliminate the inconvenience of pre-weighing filters by providing the filter weight on each cassette prior to sampling.

Zefon begins the process of manufacturing pre-weighed cassettes by letting each filter equilibrate to the environmental conditions of 68° F and 50% relative humidity. Filters are then weighed using advanced microbalance equipment which records the weight. After reading the weight, filters are removed, placed into cassettes and sealed with a label bearing the weight and a unique serial number.

• 2 or 3 piece housing
• Preloaded, ready to use
• Each cassette labeled with serial number
• Color coded to indicated filter type
• 5 Decimal weight accuracy (.00001g)
• Use of Pure Homopolyer PVC filters provide excellent weight stability
• PVC filters specially designed with no silica and low ash properties

FILTER TYPE	PURE HOMOPOLYMER PVC
PORE SIZE	5.0um	5.0um
HOUSING STYLE	3PC 37MM	2PC 37MM
WEIGHT TOLERANCE	10ug	10ug
COLOR CODE	RED	RED
PACK SIZE	50/BOX	50/BOX
PRODUCT NUMBER	7P53P	7P52P

Know what you are buying! All Zefon pre-weighed cassettes are weighed to a 5 decimal accuracy (e.g. .00001g). Some competitive brands are only weighed with a 4 decimal accuracy and are unacceptable for some applications. Using Zefon pre-weighed cassettes does not comply with OSHA directives which require both the “tare weight” and “secondary weight” to be performed on the same microbalance and environmental conditions. If complying with this directive is a concern, match-weighed cassettes are a good alternative way to save time and still comply with the directive. Environmental conditions can have a significant effect on filter weight readings. When using Zefon pre-weighed cassettes, it is important that the post sample weighing is performed under the same environmental conditions used at the Zefon factory. Those conditions are set at a temperature of 68° F (± 0.1°F) and a relative humidity of 50% (± 1%).

  37mm 2pc 5.0µm PVC Preweighed
  Product #: 7P52P

$175.00  

  37mm 3pc 5.0µm PVC Preweighed
  Product #: 7P53P

$175.00