What does MSTFAB manufacture?

MSTFAB is the international brand of Guangzhou Maisituo Sheet Metal Manufacturing Co., Ltd. It makes drawing-defined sheet metal parts and empty mechanical enclosure shells for OEM buyers, using laser cutting, CNC bending, welding and mechanical assembly. Surface treatments such as powder coating may be coordinated with external partners depending on the order.

Which materials does MSTFAB work with?

Common options include carbon steel, galvanized steel, stainless steel and aluminum. Grade, thickness, dimensions, critical tolerances, hardware, finish and inspection criteria are specified per project on the approved drawing.

What are the MOQ and lead time for custom sheet metal parts?

There is no single MOQ or lead time that applies to every part. MOQ, price, achievable tolerances, lead time, finishing route and inspection deliverables are confirmed in the project quotation and purchase order after the drawing is reviewed.

Does MSTFAB supply electrical components or certified finished equipment?

No. The normal supply scope is fabricated metalwork and empty mechanical housings. Electrical components, wiring, software, system integration and final equipment certification remain with the buyer unless a written quotation or contract explicitly includes them.

How do I request a quote?

Send STEP, STP, DXF, DWG or PDF files with the drawing revision, material and thickness, quantity, critical dimensions, hardware, finish, inspection needs and delivery destination through the RFQ page at https://mstfab.com/contact/.

FDA-Regulated Facility Distribution Boxes: Zone & Panel Guide | MSTFAB

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⚡ Direct Answer: How to Allocate Galvanized Distribution Boxes Across FDA Facility Hygiene Zones?

In FDA-regulated food processing and pharmaceutical manufacturing facilities, galvanized steel electrical distribution box shells are strictly designated for Zone 3 (Non-Contact / Secondary Packaging) and Zone 4 (Dry Utility Gray Spaces), while Zone 1 (Direct Product Contact) and Zone 2 (Splash Zones) mandate 304/316L stainless steel. To comply with Current Good Manufacturing Practice (cGMP under FDA Title 21 CFR Part 117), galvanized distribution boxes must incorporate 4 hygienic engineering controls: 1) Sloped Shedding Roof Canopy (15°–20° Slope): Preventing liquid pooling, dust collection, and tool resting; 2) Non-Shedding Electrostatic Powder Coating: Applying FDA-compliant polyester powder over ASTM A653 G90 galvanized sheet to eliminate zinc white rust flaking; 3) Continuous Seam TIG Welds Ground Flush: Eliminating crevices where microbial contamination can hide; and 4) Wall Standoff Spacing (50mm–75mm Clearance): Enabling full 360° sanitization washdown behind the panel.

Specifying 316 stainless steel for every lighting panel and motor disconnect across an entire food processing campus inflates capital costs unnecessarily. By applying cleanroom hygiene zoning principles, facility engineers can safely deploy powder-coated galvanized steel distribution boxes in dry secondary packaging and utility corridors. MSTFAB manufactures custom cGMP-compliant distribution box shells designed for FDA facility sanitation audits.

Empty galvanized coated and stainless distribution box shells for different facility zones

Hygienic distribution box shells: Sloped roof canopy, continuous TIG welds, and food-safe non-flaking powder coating.

FDA Facility Hygiene Zoning (Zone 1 to Zone 4) Electrical Enclosure Selection

Hygiene Zone	Typical Facility Location	Approved Metal Substrate	Sanitary Design Requirement
Zone 1 (Product Contact)	Inside filler bowls, hoppers, product vats	316L Stainless Steel Only	Ra < 0.4µm electropolish, IP69K washdown rating.
Zone 2 (Washdown Splash)	Adjacent conveyor walls, CIP cleaning zones	304 / 316 Stainless Steel	NEMA 4X / IP66, 30° sloped roof, standoff wall brackets.
Zone 3 (Non-Contact Dry)	Secondary packaging, robotic palletizing, carton lines	Powder-Coated Galvanized Steel	NEMA 12 / IP54, 15° watershed roof, non-shedding coating.
Zone 4 (Utility Corridor)	Electrical switchgear rooms, boiler chases	Galvanized / Painted Steel	Standard industrial distribution box shells with lockable latches.

DFM & Hygiene Engineering for FDA Facilities

Inspecting empty galvanized distribution box shell with cold wall standoffs and drain provision

Cold-Room Condensation Standoffs

In refrigerated storage and packaging rooms, stainless standoff brackets isolate the enclosure from cold panels, eliminating moisture sweating on the cabinet rear.

Quality technicians inspect empty galvanized distribution box first article and coating

First Article Inspection & Cleanliness

Our quality engineering team measures roof slope angles, door gasket compression, and surface finish uniformity, ensuring zero sharp edges or particle-trapping crevices.

Custom Distribution Box Shells for FDA-Regulated Facilities

Send your panel specifications, hygiene zoning details, and dimensions. MSTFAB provides precision sloped-top CNC fabrication, food-safe coatings, and fast turnaround.

Request FDA Facility Box Quote

Frequently Asked Questions (FAQ)

Why are bare galvanized surfaces prohibited in FDA food packaging zones?

Bare zinc can react with ambient humidity and chemical sanitizers, forming zinc oxide white rust that can flake off into open food containers. Electrostatic powder coating over galvanized steel creates a smooth, non-porous cleanable barrier.

What roof slope angle is recommended for cGMP compliance?

We recommend a 15° to 20° forward or side slope for dry utility rooms, and up to 30° in secondary packaging areas to ensure liquid runoff and prevent workers from storing foreign items on top of panels.

Does MSTFAB supply both stainless steel and galvanized distribution boxes?

Yes. We manufacture 304/316L stainless steel enclosures for Zone 1 and Zone 2 washdown areas, as well as powder-coated galvanized steel enclosures for Zone 3 and Zone 4 dry areas, providing a single-source solution.