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Allied Moulded Fiberglass Enclosures Technical Specifications

An enclosure is a housing constructed to provide a degree of protection from accidental contact with the enclosed equipment and external environmental conditions. Fiberglass enclosures are designed to provide optimum protection in the harshest environments, from water treatment facilities and irrigation systems to oil refineries and chemical processing plants.

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Click Here for Allied Moulded Part # Cross Reference:
Hoffman | Stahlin | Vynckier

Fiberglass Enclosures - About
Fiberglass Enclosures - Chemical Resistance Table
Fiberglass Enclosures - Allied Moulded Specifications
Fiberglass Enclosures - Physical Properties
Fiberglass Enclosures - EMI/RFI Specifications
Fiberglass Enclosures - Weathering/UV Information
Fiberglass Enclosures - Painting Information
Fiberglass Enclosures - Enclosure Ratings
Fiberglass Enclosures - International Standards
Fiberglass Enclosures - Sources of Standards


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  • All fiberglass enclosures are listed under UL standard 508, (CSA standard 22.2 No. 14-M91). This type of enclosure is suitable for both indoor and outdoor use in corrosive environments and is resistant to UV degradation. Fiberglass material shall meet UL 746C requirements with halogen-free and self-extinguishing characteristics.
  • Enclosure is constructed using a hot compression-molded process and a fiberglass reinforced polyester resin compound with a minimum of 20% fiberglass by weight. A cold molded procedure may be used for larger cabinets.
  • Fiberglass reinforced polyester exhibits high impact resistance, a superior range of temperature limits, excellent dimensional stability, excellent electrical properties, and excellent moisture and overall chemical resistance.
  • Standardizing enclosure performance is accomplished by use of rating systems of various specifying organizations (NEMA, UL, CSA) identifying an enclosure´s ability to resist external environmental influences. These ratings have distinct differences even though they are intended to provide information in order to make a safer and informed product choice.
  • Any external metal parts shall be 304 stainless steel. Any internal metal parts shall be manufactured using corrosion resistant materials.
  • NEMA Type 4X enclosures are fabricated and rated specifically for resistance to corrosive elements.
  • Fiberglass Reinforced Polyester is the material of choice in applications where physical strength specifications are average and excellent corrosion resistance is required.
  • Advantages of non-metallic enclosures: (1) Unlike metals, fiberglass reinforced polyester is non-corrosive. (2) Enclosures are homogeneous, thus they require little maintenance. (3) Due to their light weight, non-metallic enclosures can be very easily handled, installed, and modified.

Chemical Resistance Table

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  • See chart below for ratings for specific reagents.
  • In most applications, fiberglass reinforced polyester offers the best all around performance in corrosive environments.
  • These environmental resistance ratings are based upon tests where the specimens were placed in complete submergence in the reagent listed. If there are any questions for specific suitability in a given environment, prototype samples should be tested under actual conditions.
  • The prospective user must determine the application of our product in an environment based upon individual characteristics. We offer no guarantee or warranty as to the applicability of this chart for any particular situation as actual conditions of use are beyond our control. In many applications, several corrosive agents are present and reactions among them are not always documented. Any environment can be rather unique necessitating the identification of all possible corrosive elements that may affect the intended enclosure application.
Chemical Resistance Ratings

A = Excellent
B = Limited
C = Poor

Salts Rating Acids Rating Bases Rating
Ammonium sulfate AAcetic acid AAmmonia 5% B
Potassium ammonia sulfateABenzoic acid AAmmonia 25% B
Ammonium bichromate 20%BBoric acid ABarium hydroxide 10% C
Ammonium carbonate 10%BChromic acid 30% C Calcium hydroxide C
Ammonium chlorideACitric acid ASodium hydroxide 5%B
Ammonium nitrate B Formic acid 25% BSodium hydroxide 20%C
Ammonium sulfate 10% BHydrochloric acid 10%A Organic Solvents Rating
Ammonium acetateBConcentrated hydrochloric acidB Acetone C
Aniline sulfate ALactic acid 1%A Amyl alcohol B
Carbonate of bariumCNitric acid 5%B Methanol B
Chloride of bariumANitric acid 50%C Ethyl alcohol B
Calcium chloride, sat. sol.AConcentrated nitric acidC Benzene B
Calcium hypochloriteBPhosphoric acid 25%B Butyl acetate C
Calcium sulfate A Phosphoric acid 50% C Carbon bisulfide C
Copper (II) chloride A Sulfuric acid 25% A Gasoline A
Copper (III) sulfate A Sulfuric acid 50% C Petroleum A
Iron (III) chloride A Tartaric acid A Naphtha A
Iron (III) nitrate A Oxalic acid, saturated solution A Perchloroethylene B
Iron (III) sulfate A Other Agents Rating Toluol B
Iron (II) chloride A Ethylene glycol sol. of 0 to 100% A Ethyl acetate B
Iron (II) sulfate A Glycerine A Dichlorethylene B
Magnesium chloride A Chlordioxide (bleaching agent) C Ether B
Magnesium sulfate A Saturated chlorinated water A Oils & Greases Rating
Mercuric (II) chloride A Formaldehyde 10 to 40% A Fatty acids A
Nickel chloride A Hydrogen peroxide 5 to 10% A Oleic acid A
Nickel nitrate A Normal water A Stearic acid A
Nickel sulfate A Distilled water A Lubricating oil A
Potassium carbonate B Sea-water A    
Potassium chloride A Phenol B    
Potassium nitrate A        
Potassium sulfate A        
Nitrate of silver A        
Sodium acetate A        
Sodium bicarbonate 10% A        
Sodium carbonate 10% B        
Sodium chloride A        
Sodium hypochlorite 5% B        
Sodium nitrate A        
Zinc chloride A        
Sulfate of zinc A        

Allied Moulded Specifications

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Fiberglass enclosures will be UL listed to UL standard 508, CSA standard 22.2 No. 14-M91. The resin system will be pigmented gray, unless otherwise approved. The resin system will include a flame retardant agent in order to achieve a flammability rating in accordance with UL 94. The enclosure must be hot compression molded from FRP material containing at least 20% fiberglass by weight. Cold molded hand lay up may also be used. The enclosure body will be a one-piece construction and not contain any glued parts.

Junction and control enclosures may have either screw, hinged or latched covers. All cover screws and hardware; including hinges, latches and mounting feet are constructed of 304 stainless steel material. All internal metal parts are fabricated using corrosion resistant materials. All gaskets are seated in a molded channel and not glued or poured onto a flat cover surface.

Cabinets and larger style enclosures are always provided with hinged doors. The closure systems on these cabinets will either be a three point latching system or a system of external stainless steel twist-turn type latches. Door closure systems using a single external handle will also have three internal latch points. This handle may be key lockable or padlockable. When using the alternative closure method of external stainless steel twist turn latches, no more than four latches shall be required to maintain NEMA 4X integrity. At least one latch must have a padlock provision.

Physical Properties

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Materials Typical Properties Test Method ASTM Polyester Fiberglass Compression Molded Polyester Fiberglass Hand Lay-up
Flexural Strength (PSI) D790 13,000-15,000 33,000
Tensile Strength (PSI) D638 5,000-6,000 22,000
Tensile Elongation (%) -- 0.5 2.07
Compressive Strength (PSI) D695 14,000-16,000 30,000
Impact Strength
IZOD Notched (ft lb/in)
D256 4-7 --
Specific Gravity Molded D792 1.95 1.65
Barcol Hardness -- 40 60-65
Water Absorption
(%change in wt. 24/168 hr)
D570 .11/.25 .025
Arc Resistance (sec) D495 180+ --
High Voltage
Arc Resistance (120 sec)
-- No ignition --
Dielectric Strength (volt/mil) D149 397/310 --
Volume Resistivity (ohm/cm) D257 8.62 x 10^14 --
Service Temperature Range (°F) -- -40° to 266° -31° to 266°
Heat Distortion
(temp. C degrees, 264 psi load)
D648 431 F/222 C 428 F/220 C
Flame Resistance D635 94V-0 94V-0

EMI/RFI Specifications

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  • Standards governing electromagnetic compatibility commonly refer to EMI/RFI, or electromagnetic interference/radio frequency interference.
  • Applicable standards used are based on MIL-STD-285 to perform attenuation measurements of EMI/RFI shielded enclosures. The applicable North American standards for the overall assembly, including internal electronics, can vary with the application in which the product is intended to be installed.
  • For a complete list of applicable standards, your local testing authority (for example, UL, CSA) should be contacted.
  • Such interference is caused by stray voltages and/or currents coupling between electronic systems creating undesirable effects. These undesirable effects can vary between a brief annoyance, to more serious situations, such as a phone interfering with the controls of a machine tool. With the increased emphasis on electronic technology, electromagnetic interference/radio frequency interference is a growing concern.
  • Electromagnetic pulses (EMPS) may adversely affect electronic and other control systems. These disturbances may cause erratic operation, and either component failure or a reduction in component life.

Shielding Material Silver Plated Copper
Binder Acrylic
Sheet resistance < 0.120 ohms/square/mil
Attenuation 75 dB

Sheet Resistance < 2.5 Ohms/Square/mil 1-1.5 Mil Thick
The probes of an ohmmeter shall be placed on any area of the surface and the measured resistance shall not exceed 0.120 ohms.
Attenuation 75 dB
A measure of the shielding effectiveness shall be confirmed by an EMI/RFI test. Actual test data confirmed an average attenuation of 75 dB over the frequency range from .01 to 1000 Mhz.
MIL.SPEC>285 is used as a general EMI/RFI test guide. A transmitting antenna is placed inside the enclosure and a receiving antenna is positioned outside. The attenuation is the dB difference between the enclosure OPEN and CLOSE FR power levels.

Weathering/UV Information

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Allied Moulded fiberglass electrical enclosures are hot compression molded. All products of this type, regardless of manufacturer, are exposed to erosion when used outdoors. Due to the combined effects of environmental elements such as rain, wind and UV rays, the polyester matrix is only superficially eroded and as glass fibers become apparent, the degree of the erosion is microscopic. Please note that this superficial erosion has no effect on the physical characteristics of the enclosure whether electrical, mechanical or chemical. The slight erosion can be avoided if a surface coating such as varnish is applied.

Allied Moulded products' have been successfully used outdoors and tests on field samples support above results.

Painting Information

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Good surface preparation is critical in painting fiberglass enclosures, since the mold release agents must be removed before painting. It is recommend that the surface be roughed by lightly rubbing with sandpaper before applying the proper primer. Degreasing the surface with an organic solvent such as alcohol or other domestic cleaning agent is required. The surface must be clean and dry prior to applying the appropriate primer and top coat (polyurethane or epoxy).

Heat Dissipation
Information available upon request.

Enclosure Ratings

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In order to assist in the selection of an enclosure, rating classifications have been established by the National Electrical Manufacturers Association (NEMA). These ratings identify the ability of the enclosure to provide a degree of protection against incidental contact with the enclosed equipment and protection to the enclosed equipment from environmental elements such as dirt, dust, water and other corrosive agents. Underwriters Laboratories (UL) and the Canadian Standards Association (CSA) are widely recognized testing organizations that perform enclosure product testing to these standards and provide regular follow up service to ensure that manufacturers conform to established product and manufacturing specifications. These ratings, however, are intended to be used only as a guide. To ensure a proper choice, it is recommended that an assessment of the application and environment be conducted before product selection.

Indoor use to provide a degree of protection against falling dirt.

Indoor use to provide a degree of protection against limited amounts of falling water and dirt.

Indoor or outdoor use to provide a degree of protection against falling dirt, rain, sleet, snow and windblown dust; and that will be undamaged by the external formation of ice on the enclosure.

Indoor or outdoor use to provide a degree of protection against falling dirt, rain, sleet and snow; and that will be undamaged by the external formation of ice on the enclosure.

Indoor or outdoor use to provide a degree of protection against falling dirt, rain, sleet, snow, windblown dust, splashing water, hose-directed water; and that will be undamaged by the external formation of ice on the enclosure.

Indoor or outdoor use to provide a degree of protection against falling dirt, rain, sleet, snow, windblown dust, splashing water, hose-directed water and corrosion; and that will be undamaged by the external formation of ice on the enclosure.

Indoor or outdoor use primarily to provide a degree of protection against the entry of water during occasional temporary submersion at a limited depth.

Indoor use to provide a degree of protection against falling dirt; circulating dust, lint, fibers and flyings; and dripping and light splashing of liquids.

Indoor use to provide a degree of protection against falling dirt; circulating dust, lint, fibers and flyings; and spraying and seepage of water, oil and non-corrosive coolants.

International Standards

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The first digit character represents the degree of protection against a person´s contact with live parts and the protection of the equipment against the ingress of solid foreign bodies. The second digit represents the degree of protection against the ingress of liquids. Both of these values are represented in ascending value with the larger number equaling the greatest protection.

First Digit Second Digit
IP Test IP Test
0 No protection 0 No protection
1 Protection against solid bodies larger than 50 mm (for example accidentally touching with the hand) 1 Protection against vertical water drops and condensation
2 Protection against solid bodies larger than 12 mm (for example a finger) 2 Protection against water drops up to 15° from the vertical
3 Protection against solid bodies larger than 2.5 mm (tools, wires) 3 Protected against rain up to 60° from the vertical
4 Protection against solid bodies larger than 1mm (tools, wires) 4 Protected against water splashing from a hose from all directions
5 Protection against dust (no harmful deposits) 5 Protected against water sprayed from a hose from all directions
6 Complete protection against dust 6 Protected against water projections similar to sea wave splashes
7 Protected against the effects of immersion
8 Protected against effects of prolonged immersion under pressure

Sources of Standards

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National Electrical Manufacturers Association
NEMANational Electrical Manufacturers Association
  • 1300 N.17th St., Suite 1752, Arlington, VA 22209
Underwriters Laboratories Inc.
ULUnderwriters Laboratories Inc.
  • 2600 N.W. Lake Rd., Camas, WA 98607-8542
Canadian Standards Association
CSACanadian Standards Association
  • 5060 Spectrum Way, Suite 100, Mississauga, Ontario L4W 5N6 CANADA
Joint Industry Council c/o AMT - The Association for Manufacturing Engineering
JICJoint Industry Council c/o AMT - The Association for Manufacturing Engineering
  • 7901 Westpark Dr., McLean, VA 22101
Electronic Industries Alliance
EIAElectronic Industries Alliance
  • 2500 Wilson Blvd. # 310, Arlington, VA 22201-3834

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