Scenario-Based Enclosure Material Selection, Coastal, Chemical, Solar, EV Charging

This article covers the following content

If you are an EPC project manager or electrical engineer and are choosing enclosure materials for a specific project, this article will help you figure it out:

1. Why is "selecting materials based on the scenario" more practical than "comparing parameters based on materials"?

2. Material Recommendations for 7 Major Applications: Coastal Areas, Chemical Industry, Photovoltaics, Charging Piles, Food Processing, High-Altitude Installation, and Frequency Converters

3. Selection Guide for Each Scenario: Avoiding Pitfalls

4. A quick reference chart to pinpoint the material direction of a project

This article is by BSUMWELL Written by our technical team, we are a manufacturer specializing in waterproof electrical enclosures. Our products cover three major material series: PC/ABS plastic, stainless steel, and aluminum enclosures, with protection levels ranging from IP55 to IP68. We support OEM/ODM customization.

Why is "selecting materials based on the scenario" more practical than "comparing parameters based on materials"?

The same material can exhibit drastically different performances in different scenarios.

PC/ABS plastic shells can last 10-15 years in normal outdoor environments, but in the organic solvent vapor environment of chemical plants, they may stress crack after 6 months.

316 stainless steel is the "standard answer" in coastal environments, but in inverter scenarios with strong electromagnetic interference, it may become a safety hazard if it is not grounded.

There is no absolute "good" or "bad" in materials, only "suitable" or "unsuitable".

The correct logic for choosing materials is not "which material is the best", but "what environment my project is in and what materials it needs".

The three-step logic of scenario-based selection

Step 1: The core challenge of scene identification

• Coastal → Salt spray corrosion

• Chemical Industry → Chemical compatibility

• Photovoltaics/Energy Storage → Heat dissipation + UV protection

• Charging pile → Impact resistant + Insulation

• Food processing → Sanitary requirements

• High-altitude installation → Lightweight

• Frequency converter → EMI shielding + heat dissipation

Step 2: The core advantages of matching materials

• Corrosion protection required → Stainless steel

• Needs heat dissipation → Aluminum casing

• Insulation required → PC/ABS plastic

• Lightweight required → PC/ABS plastic or aluminum

• EMI shielding required → Metal casing

Step 3: Confirm the supporting requirements

• Stainless steel/aluminum casing must be grounded.

• The metal casing requires stainless steel fasteners.

• The plastic casing needs to have a UV-resistant formula confirmed.

General Reminder: Regardless of the material chosen, the material of the sealing strip must match the environment — silicone for coastal areas (UV resistant), and FKM for chemical industries (resistant to chemical solvents).

Read the first article in this series, "Plastic Shell vs. Metal Shell - A Complete Comparative Analysis".

Coastal/Marine Environment Shell Material Selection – Corrosion Resistance is the Top Priority

Three major corrosion challenges in coastal environments

Corrosion of electrical enclosures in coastal environments comes from three sources:

• Salt spray: Salt spray particles formed by seawater evaporation adhere to the outer shell surface, causing electrochemical corrosion (according to ASTM B117 salt spray test standard).

• High humidity: The high humidity along the coast accelerates metal corrosion.

• Ultraviolet rays: Direct sunlight outdoors accelerates the aging of plastics.

Chloride ions in salt spray are "the sharpest knife". It can penetrate the oxide film of ordinary metals, causing pitting and rust.

Material recommendations: 316 stainless steel is the first choice; aluminum requires a recoating.

Our stainless steel housing series (304/316 optional) is suitable for coastal high salt spray environments and material certification (MTC) is available. View stainless steel casing series

Coastal Project Selection and Avoidance Guide

• Pitfall 1: Replacing UV-resistant PC with ordinary ABS

• As a result of Coastal environments will cause the material to crumble and crack within 1-2 years.

• Correct approach UV-resistant PC/ABS must be selected.

• Pitfall 2: Damaged aluminum casing coating not addressed.

• As a result of Salt spray penetrates through the scratch, causing pitting corrosion to spread rapidly.

• Correct approach Protect the coating during installation and repair scratches promptly.

• Pit 3: Outer shell 316, screws 304

• As a result of Electrochemical corrosion caused the screws to rust and break first.

• Correct approach The entire system is made of 316 stainless steel.

• Pitfall 4: Ignoring the aging of the sealing strip

• As a result of Ordinary PU sealing strips harden in 6-12 months under UV + salt spray conditions.

• Correct approach Silicone sealing rings are selected for coastal projects.

Chemical plant electrical enclosure material selection – chemical compatibility is key.

Corrosion types in chemical plants (acids and alkalis vs. organic solvents)

Corrosion in chemical plants can be categorized into two types:

• Acidic and alkaline environments: Such as sulfuric acid and sodium hydroxide—PC/ABS plastics have good resistance to these media.

• Organic solvent environment: For substances like acetone and benzene, PC/ABS plastics may experience stress cracking (ESC, according to ISO 22088, Environmental Stress Cracking Test Standard for Plastics), requiring the use of stainless steel.

Before selecting a solution, it is essential to confirm: What chemical media are present in the project environment?

Recommended materials: PC/ABS for acidic and alkaline environments, stainless steel for organic solvents.

Our PC/ABS housings are made with a UV-resistant formula, making them suitable for acidic and alkaline environments in chemical plants; our stainless steel housings are suitable for environments with organic solvents. Contact us for chemical compatibility assessment advice.

Chemical Plant Selection Guide

• Pitfall 1: Ignoring the influence of organic solvents

• As a result of Under the combined effects of installation stress and organic solvent vapor, the plastic casing may experience brittle cracking around the screw holes without warning.

• Correct approach Confirm the PC/ABS material's resistance to organic solvents in the project environment. For environments with high concentrations of organic solvents, it is recommended to replace it with stainless steel.

• Pitfall 2: Only looking at concentration when confirming chemical compatibility

• As a result of Weak acids at high temperatures may be more corrosive than strong acids at room temperature.

• Correct approach Taking into account the effects of temperature, pressure, and concentration on the corrosiveness of chemical media.

• Pitfall 3: Ignoring the chemical compatibility of sealing strips

• As a result of The sealing strip is corroded by chemical media, loses its elasticity, and fails to waterproof.

• Correct approachChemical plants recommend using FKM (fluororubber) sealing rings.

Photovoltaic/Energy Storage Housing Material Selection – Balancing Heat Dissipation and UV Resistance

Operating characteristics of photovoltaic inverters and energy storage cabinets

Operating characteristics of photovoltaic inverters and energy storage cabinets:

• Persistent fever The internal high-power components are concentrated, and the temperature inside the chamber can be 20-30°C higher than the ambient temperature (based on industry-standard thermal testing data).

• Direct sunlight outdoors 24/7 exposure to ultraviolet radiation

• Temperature difference circulation The risk of condensation due to the temperature difference between day and night.

• High protection requirements Typically requires IP65 or higher.

Material recommendations: Aluminum casing is preferred for heat dissipation; PC/ABS casing should be UV resistant.

Our aluminum housing series comes standard with a marine-grade coating, offering excellent heat dissipation and making it suitable for photovoltaic inverters and energy storage cabinets. View the aluminum casing series

Photovoltaic Project Selection Pitfalls Avoidance Guide

• Pitfall 1: Neglecting heat dissipation design

• As a result of Plastic is a thermal insulator; heat accumulates in high-power devices inside, shortening the lifespan of components.

• Correct approach For high-heat-generating equipment, aluminum casings should be preferred, or heat convection/fan designs should be added.

• Pitfall 2: Using ordinary ABS outdoors under direct sunlight

• As a result of Ordinary ABS will yellow and become brittle in 6-12 months under photovoltaic applications.

• Correct approach UV-resistant PC/ABS must be selected.

• Pitfall 3: Ignoring condensation issues

• As a result of The temperature difference between day and night caused condensation inside the box, resulting in a short circuit in the components.

• Correct approach Optional waterproof and breathable valve to balance the internal and external pressure difference.

Charging Pile Shell Material Selection – A Balance Between Impact Resistance and Insulation

Special requirements for the casing of charging piles

Special requirements for the casing of charging piles:

• Impact resistance Located in an outdoor public area, it faces the risk of vehicle collisions and vandalism, requiring an impact energy of IK10 (according to IEC 62262 standard, IK10 = 20J).

• Insulation The interior contains high-voltage electrical components, and the outer casing needs to be insulated or reliably grounded.

• Anti-vandalism Requires anti-disassembly design

• Brand logo OEM logo silkscreening is usually required.

Recommended materials: Stainless steel/aluminum for impact resistance, plastic for internal insulation.

Our stainless steel and aluminum casings meet an IK10 impact resistance rating, making them suitable for charging station enclosures. Contact us for charging station enclosure solutions.

Charging Pile Selection Guide

• Pitfall 1: Ignoring impact resistance rating

• As a result of Charging stations are located in public areas and are potentially vulnerable to vehicle collisions and vandalism.

• Correct approach It is recommended that the main body of the casing meet IK10 standards.

• Pit 2: Metal casing not grounded

• As a result of When internal insulation fails, the outer casing may become electrified, endangering personal safety.

• Correct approach The metal casing must be reliably grounded.

• Pitfall 3: Ignoring OEM customization requirements

• As a result of The project failed to meet the carrier's brand colors and logo requirements, affecting project acceptance.

• Correct approach: Confirm supplier support for OEM customization

Material selection for food processing/pharmaceutical casings – Sanitary stainless steel is the dominant grade.

Special requirements for food processing environment

Special requirements for food processing and pharmaceutical factories:

• High-frequency rinsing: Wash with a high-pressure water gun daily.

• High-efficiency disinfectant: Resistant to acids, alkalis and disinfectants

• No blind spots: There should be no gaps or crevices where dirt and grime can accumulate.

• Sanitary Standard: Typically, 304/316 stainless steel with a mirror finish is required.

Recommended material: 304/316 stainless steel (without any dead angles, mirror polished)

Our stainless steel housing series offers a flawless mirror-polished finish, suitable for food processing and pharmaceutical plants. View stainless steel casing series

Food Processing Equipment Selection Guide

• Pitfall 1: Replacing stainless steel with a plastic casing

• As a result of Plastics are prone to aging under high-frequency washing conditions, and dirt and grime can accumulate in the crevices.

• Correct approach Food processing environments must be made of 304/316 stainless steel.

• Pitfall 2: Ignoring surface finish requirements

• As a result of The surface roughness does not meet the standards and cannot pass the hygiene inspection.

• Correct approach Confirm that the surface finish of the stainless steel casing meets sanitary standards (typically requiring Ra≤0.8μm).

Material selection for pole/high-altitude installation housings – lightweight is the priority

Hidden costs of high-altitude installation

In pole-mounted or high-altitude operations, the hidden costs associated with weight are often overlooked.

• Bracket reinforcement cost: The stainless steel casing is heavy, so the support frame needs additional reinforcement.

• Hoisting cost: Heavy-duty casing requires hoisting equipment.

• Labor costs: Requires multiple people to move and install.

Choosing lightweight materials saves on overall installation costs.

Recommended materials: PC/ABS plastic or aluminum casing

Our PC/ABS plastic housing weighs only 1/3 the weight of stainless steel, making it suitable for pole and high-altitude installations. View PC/ABS plastic housing series

High-altitude installation selection guide

• Pitfall 1: Ignoring the load-bearing limit of the support frame

• As a result of The heavy casing can cause the support frame to deform or fall.

• Correct approach Before installation, confirm the load-bearing capacity of the bracket and prioritize the use of lightweight materials.

• Pitfall 2: Ignoring the influence of wind load

• As a result of High-altitude installation locations experience significant wind loads, and the outer casing may be blown off.

• Correct approach Confirm that the casing mounting method meets the wind load requirements.

Inverter/Control Cabinet Housing Material Selection – EMI Shielding and Heat Dissipation

Electromagnetic interference issues in the inverter environment

Variable frequency drives (VFDs) generate strong electromagnetic interference (EMI) during operation. If the enclosure lacks electromagnetic shielding, this can lead to:

• Surrounding sensor signals are interfered with

• PLC malfunction

• Communication interrupted

Plastic casings lack EMI shielding capabilities, while metal casings naturally possess electromagnetic shielding capabilities (based on the Faraday cage principle).

Recommended material: Aluminum casing (for heat dissipation and EMI shielding)

Our aluminum housing series offers excellent heat dissipation and inherent EMI shielding capabilities, making it suitable for frequency converters and control cabinets. View the aluminum casing series

Material Selection Quick Reference by Scene + FAQ

Scene-Materials-Core Challenges Quick Reference

How do I use this table?

1. Confirm your Application scenarios

2. Find the corresponding table Recommended materialsandCore challenges

3. Check Special requirements One column

4. For customization, please contact customer service to confirm the solution.

The above selection is only a general suggestion. For material selection support tailored to specific projects, please contact our technical team — we can provide a free selection assessment based on your project environment and needs. Contact the technical team for a free selection assessment.

Frequently Asked Questions (FAQ) about Procurement

Q: Is it mandatory to use 316 stainless steel for coastal projects? Is 304 stainless steel acceptable?

A: It depends on the distance from the coastline. For projects more than 2 kilometers from the coastline, 304 stainless steel is usually sufficient. For projects within 2 kilometers of the coastline, such as floating solar power projects or island projects, 316 stainless steel is recommended — 316 contains molybdenum, and its resistance to chloride ion corrosion is far superior to 304.

Q: Can plastic casings be used in the acidic and alkaline environments of chemical plants?

A: PC/ABS plastics have good resistance to most acids and alkalis, making them suitable for acidic and alkaline environments in chemical plants. However, if... Organic solvent environment For substances such as acetone and benzene, plastics may experience stress cracking (according to ISO 22088 standard), so stainless steel is recommended.

Q: Should the casing of a photovoltaic inverter be made of aluminum or plastic?

A: It depends on the heat output. Aluminum casings offer the best heat dissipation and are suitable for high-heat-generating devices (high-power inverters). PC/ABS plastic is suitable for small to medium-power inverters, but a UV-resistant formulation needs to be confirmed.

Q: Why is the casing of a charging station made of metal?

A: The charging stations are located in outdoor public areas, facing risks of vehicle collisions and vandalism. The metal casing (stainless steel/aluminum) has an impact resistance rating of IK10 (according to IEC 62262 standard) and inherent EMI shielding capabilities. Internal insulation components can be made of PC/ABS plastic.

Q: What material should be chosen for pole mounting?

A: Prioritize lightweight materials — PC/ABS plastic (lightest, density approximately 1.2g/cm³) or an aluminum casing (lightweight + strong). Stainless steel casings are heavy (density approximately 7.9g/cm³), which will significantly increase the cost of bracket reinforcement and hoisting.

Summary of the key points of this article

1. Three-step logic for scenario-based selection — Identify the core challenges of the scenario → Match the core advantages of the material → Confirm the matching requirements

2. Material recommendations for 7 major scenes — 316 stainless steel is used in coastal areas; chemical plants handle acids and alkalis/solvents; aluminum is used for heat dissipation in photovoltaic systems; metal is used for impact resistance in charging piles; stainless steel is used in food processing; plastic/aluminum is used for high-altitude applications; and aluminum is used in frequency converters.

3. Each scenario includes a guide to avoiding pitfalls. —Selecting a model involves more than just choosing materials; it also requires confirming the compatible parts, sealing rings, and installation methods.

4. A quick reference chart to pinpoint material direction — Quickly match based on scenario to reduce selection time

5. Our products cover three materials. — IP55-IP68, flexibly adaptable to different scenario requirements

(Previous article: Understood the basic comparison of the three materials? Please read the first article in this series, "Plastic Shell vs. Metal Shell - A Complete Comparative Analysis of B2B Procurement.")

(Next article preview: Scenario determined? Next, let's do a 10-year cost analysis – Total Life Cycle Cost (TCO) analysis. Please read the third article in this series, "Total Life Cycle Cost Analysis: A 10-Year Total Cost for Plastic, Stainless Steel, and Aluminum Casings.")

Contact us for scenario-based product selection advice.