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Bulk Powder Bag Weighing Enclosure


The Vibration Dampening Vented Balance/Microbalance Enclosure designed to provide personnel protection to a respiratory exposure concentration down to 0.1 ug/m3 while working with bagged bulk powder substances. Specifically, the enclosure is designed to accommodate the loading and weighing of bagged Highly Potent Pharmaceutical Ingredients (HPAPI). Design accounts for a manipulated quantity of 1-999 kilograms of powder.  20” outer diameter Delrin ring bulk-powder drum membrane system compatible with drums between the dimensional range of [15”H x 13”OD] to [29”H x 18.5”OD]. Metallic recess with acrylic viewing panel included for ease of viewing balance measurements. Features cubical graphite balance stand to prevent vibrational interference typically incurred during a process involving the weighing of bagged product with expected output on the microgram scale.

The enclosure features include the following:

  • polypropylene superstructure
  • removable draftshield with 8” oval glove ports
  • right-side continuous liner for waste disposal and transport of bagged product
  • acrylic viewing panels for optimal viewing of work surface

Additionally, the enclosure is designed to enclose a weighing operation requiring the containment of a 4-position analytical pan balance and 6-position analytical balance (aka. microbalance).  The cubical graphite balance stand is included within design to attenuate vibrational interference which has the propensity to contribute to statistical noise in weight/mass measurements.

Top mounted Fan/Filter Housing features automatic toggling between two speeds (set by a professional certifier) upon removal/replacement of gloveport draftshield.

  • Integrated alarm system alerts the user when face velocity is above or below the upper/lower calibrated setpoints.
  • Misting Wand connection available for use when cleaning and decontaminating enclosure interior.


External Width: 119″
External Depth: 26″
Internal Height: 27″


Performance is paramount in the safety industry. Through consistent design quality and expert manufacturing, Flow Sciences’ units perform.  With surrogate powder testing both in our facility as factory acceptance testing (FAT) and at the customer facility as site acceptance testing (SAT), we consistently exceed our customers’ containment targets and goal expectations.


Containment Target : 1,000 ng/m³
Surrogate Powder Testing Result :  4 ng/m³

Equipment : Balance, Bulk Powder Bag
Operation : Bulk Powder Weighing
Test : Lactose – 3 x 15 kg







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