PROLITE PLASTICS LTD.
PER-LAB PERCHLORIC AND ASSAY LABORATORY FUMEHOODS

Introduction:

The PER-LAB hood design represents years of successful use under the most severe operating conditions and under the worst mineral acid fume conditions such as those found in an Assay Laboratory.

The PER-LAB Perchloric hoods are multi-acid and dual purpose. Unlike stainless steel or fiberglass, the thermoplastic liner will withstand all the predigestion acids of HNO3, HF, Aqua-Regia, HCl, H2SO4, etc., which normally precede the use of HClO4 (Perchloric).

Features:

• resistant to acid and alkali fumes
• properly designed internal scrubbing section
• excellent lighting
• improved fume capture as the major slot is located just above the beakers
• excellent access height
• will accept 3 1/2 kW hot plates
• low noise level
• non-drip slot design
• reduced airflow needs, max. 125 FPM face velocity
• seamless interwelded PVC construction throughout
• fiberglass external armouring

General:

The heavy duty and long life design of the PER-LAB Assay-Perchloric fumehoods are designed to handle all mixed assay acids as well as perchloric at the same time. Of the three designs, types 'Pa' and 'FH' are the preferred by most professional Assayers.

• Type Pa - Standard Assay design
• Type FH - Standard Assay design but has a front beaker shelf set flush with the hot plate and uses less airflow
• Type SAS - Full sliding sash, either Pa or FH modes

Specification Data:

Assayers, Consulting Engineers, Architects and Chemists can obtain:

• Detailed hood design specifications
• Operating and Installation data to achieve Fail-Safe operation
• Operating and Maintenance data on Prolite's MV-fans and on Prolite's advanced design CT-120/2 eliminators and LMITS inertial scrubbers.

Materials:

To achieve maximum corrosion resistance, hood internals are all thermoplastic and predominantly PVC and corrosion resistant fiberglass is applied externally. Support and beaker shelving is made from tempered glass. The lower back plenum is made from tempered glass. PER-LAB hoods do not have any metals in the air stream.

Perchloric:

PER-LAB hoods have a CPVC header with multiple overlapping wide angle sprays to optimize fume scrubbing at source. No spray water or condensate will drip onto working areas as the beveled main slot is offset.

Hood Performance:

Fume removal is very efficient as the main slot is located above the beakers. This leads to less unwanted cooling of the hot plates. We recommend a maximum face velocity of 125 FPM.

Fume Scrubbing:

In cities and urban areas, better scrubbing efficiency is achieved with the Prolite LMITS inertial scrubber. For sparse and mine site areas, the proven CT-120/2 eliminator will remove macro-solids and droplets down to around 12 microns and, similar to the LMITS, prevent freeze-up of condensate in winter.

Lighting:

Twin tube flourescents shine through a clear PVC top panel. They are designed for immediate removal.

Electrical Outlets:

Total PVC construction. Single gang boxes are welded to the hoods. Weather proof 110V PVC outdoor duplex outlets and PVC toggle switches are standard.

Non Metallic:

No metals whatsoever are used inside the hoods.

Construction:

The hood construction follows Dual Laminate chemical plant standards where the fiberglass is bonded to the PVC. This achieves higher strength, higher heat deflection and has the PVC protecting the Fiberglass against aggressive acids.

Other Literature:

• MV series laboratory fans
• CT-120/2 eliminators
• LMITS scrubbers
• PROLAB thermoplastic sliding sash fumehoods (not suitable for 3 1/2 kW hot plates)

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© Prolite Plastics Ltd, Feb. 29, 2000