Precision Engineering for Global OEMs

Custom IP Enclosure Services

From rapid prototyping to high-volume production, Supro MFG delivers one-stop precision metal fabrication with ISO-certified quality. Reduce your lead times and production costs with our expert DFM support.

1-3 day Rapid Prototyping & Agile Supply Chain Delivery.
On-time delivery of high quality product commitments.
Extensive Material Selection & Industrial-Grade Finishing.
Direct-from-Factory Pricing & Transparent Costing.
ISO 9001-2015 / IATF 16949:2016 certified system.
Integrated Assembly: Delivering finished, ready-to-use products, not just components.

Get An Instant Quote Now

Rapid Prototypes, DFM Optimization, On-Time Delivery, Real Manufacturer Quote.

Rapid stamping die Turnaround

Committed to exceeding expectations for quality and rapid turnaround, and meeting high-quality sheet metal parts.

Consistency & high quality

Whether it is rapid prototyping & large-volume manufacturing, we will implement it according to customer needs and standards.

Low Cost Effective

Integrate product design, bending, stamping, cutting, surface treatment, etc. to provide a series of manufacturing solutions.

Precision Metal Fabrication Services in China | Custom OEM Solutions & Rapid Prototyping

Your Strategic Partner for IP Enclosure Fabrication

At Supro MFG (Supro Manufacturing Co., Ltd.), we don’t just manufacture parts; we engineer reliability. As a leading China metal fabrication factory, we bridge the gap between complex design and cost-effective production. By leveraging our ISO 9001:2015 & IATF 16949 certified facilities and a seasoned engineering team, we provide 3,000+ global clients with unparalleled custom metal fabrication services—direct from the source with transparent, manufacturer-level pricing.

We specialize in the high-quality manufacturing and assembly of custom metal parts, with processing capabilities encompassing: sheet metal fabrication, metal stamping, CNC machining, laser cutting, metal welding, metal spinning, deep drawing, aluminum extrusion, die casting, as well as customized finished product assembly and surface treatment services.

From concept prototypes to mass production,

Supro MFG is your most reliable partner and you will benefit from our manufacturing services.

Securing Your Designs with Enterprise-Grade Confidentiality at Every Stage of Manufacturing

Your Innovation, Protected:
Uncompromising IP Security & NDA Compliance

At Supro MFG, we understand that your designs are your most valuable assets. As a strategic sheet metal stamping partner, our commitment to your intellectual property is absolute. We operate under a strict Zero-Leak Policy, ensuring that every blueprint, CAD file, and prototype remains strictly confidential within our secure engineering ecosystem.

We proactively offer comprehensive Non-Disclosure Agreements (NDAs) that align with international legal standards, providing you with a transparent and enforceable framework for cooperation. Beyond legal paperwork, our internal protocols include segmented data access, secure server encryption, and rigorous staff training on IP sensitivity. Whether you are a startup scaling a disruptive product or an OEM managing sensitive aerospace components, Supro MFG acts as a secure extension of your own facility. Partner with a metal stamping manufacturer that values your competitive advantage as much as you do.

Talk to our expert team

What is an IP enclosure?

IP enclosures are precision-engineered enclosures designed to comply with IEC 60529 and NEMA standards, providing reliable protection for critical electrical components against dust, moisture, and harsh environmental conditions.

With over 20 years of experience in metal enclosure fabrication, Supro understands that achieving verifiable IP66 or IP67 protection ratings requires strict process execution on the production line. That is why we utilize high-precision CNC laser cutting, capillary-free continuous TIG welding, and automated field-in-place foam gaskets (FIPG) to ensure absolute seal integrity under pressure. Whether utilizing corrosion-resistant 316L stainless steel cold forming or reinforced aluminum alloy, we guarantee structural rigidity to effectively prevent door deformation and thermal distortion.

Supro MFG offers end-to-end custom sheet metal fabrication services, crafting custom IP enclosures tailored to your specific dimensional and environmental requirements.

Common Manufacturing Defects in IP Enclosures: Analysis and Solutions

In the manufacturing of custom IP enclosures, on-site equipment failures are rarely caused by a single major defect; rather, they are mostly the result of the cumulative effect of minor flaws in sheet metal fabrication, material handling, and surface coating processes. By combining on-site failure statistics with industry inspection data, Supro has analyzed the most common types of defects found in IP enclosures.

Permanent Compression Set and Aging of Sealing Gaskets

After prolonged exposure to thermal cycling, UV radiation, and corrosion from industrial chemicals, sealing gaskets can harden, crack, or become permanently flattened. Once a gasket loses its elasticity (developing permanent compression set), it can no longer compensate for minute deformations and displacements in the enclosure, inevitably leading to water ingress.How to Solve This?

Supro’s IP enclosures prioritize silicone rubber or EPDM (ethylene propylene diene monomer) gaskets, eliminating standard neoprene and low-cost rubber gaskets. In outdoor environments with direct UV exposure, our IP enclosures withstand extreme temperatures and resist UV-induced aging.

In addition, Supro utilizes field-in-place-formed (FIPG) foam gaskets in its IP enclosures. These continuous polyurethane (PUR) foam seals are formed through integrated spray molding, resulting in a seamless design. Unlike cut-and-glued strip gaskets, this eliminates weak sealing joints and offers superior compression recovery and resilience.

Pores and Pinholes in Continuous Welds

Corner welds on IP enclosures exhibit micro-pores and insufficient penetration, resulting in immediate failure of IP66/IP67 waterproof and airtightness testing. The root cause of these issues (welding process control) is contamination of the welds by oil residue from laser cutting; insufficient shielding gas supply and incomplete coverage of the welding hood during manual TIG/MIG welding.

Supro has implemented a comprehensive solvent-wiping degreasing process prior to welding; upgraded robotic laser welding and pulsed TIG welding equipment to ensure precise temperature control and stable argon shielding; and eliminated capillary micro-pores in IP enclosure welds, achieving fully airtight continuous welds.

Peeling and Blistering of Powder Coatings on IP Enclosures

Even minor impacts on IP enclosures can cause extensive coating peeling or internal blistering, exposing the bare metal substrate to direct contact with external moisture and dust.

The root cause (lack of surface pretreatment) is inadequate substrate preparation; rolling scale, cutting fluid, and welding fumes were not thoroughly removed, preventing the electrostatic powder coating from forming a chemical bond with the metal substrate.

Supro implements a multi-step, rigorous pretreatment process: alkaline cleaning and degreasing → multi-stage pure water rinsing → phosphating/zirconium-based conversion coating treatment. This process etches and roughens the metal surface, providing a solid adhesion base for powder coating and curing.

Transportation-related bumps, scratches, and surface wear

High-quality powder-coated and brushed IP enclosures arrived covered in scratches. The root cause (insufficient packaging protection) was vibration of the boxes during transport, resulting in metal-to-metal friction or contact with rough cardboard.

At Supro, after the powder coating oven has cooled and final product inspection is complete, low-tack PE polyethylene protective film is immediately applied to all external surfaces of the IP enclosures; non-abrasive EPE foam dividers are placed between stacked enclosures on the same pallet to provide separation.

No design files? Let Supro MFG do it for you.

We often come across clients who have no professional design drawings and documentation, only a creative idea, which leads to the project being at a standstill.

If you are in this situation, then contact our team of experts.

Supro MFG, as an industry-leading custom metal fabricator, has an ever-experienced team of engineers who utilize their extensive fabrication experience and technical expertise to build your idea into a real product and create design files such as STEP/STP/SLDPRT/DXF/PDF/PRT/DWG/AI.

That’s what makes SUPRO MFG so great, and 2,000 corporate, entrepreneurial, artist, and other purchasers from around the world enjoy working with us and benefiting from our one-stop manufacturing services.

A part is only as good as its finish.

High-Performance Surface Finishing: Aesthetics Meets Durability

At Supro MFG, we understand that professional custom metal fabrication requires more than just structural integrity—it demands surface treatments that withstand harsh environments and strict aesthetic standards.

Our integrated finishing shop provides a seamless transition from the production line to the final coating, ensuring tight control over lead times and quality.