Color & Surface Finish｜Cabinet skin engineering

Surface finish is not just color — it is environmental life and manufacturing consistency

Coating systems for large BESS cabinets are specified from outdoor exposure, corrosion class, UV, humidity, cleaning and process capability — beyond brand color alone.

Download spec template Consult a surface engineer

Scientific match from environment to coating

C-class, UV and cleaning chemistry define stack and DFT.
Substrate & pretreatment engineering

GI / CRS / SUS / Al with controlled conversion.
Color / gloss / texture control

Master panel and instrument limits — not eye match alone.
Durability & manufacturing consistency

Salt / UV / SPC and lot-to-lot ΔE control.

Environment input map: factors that decide surface engineering

Indoor / outdoor
Coastal salt spray
Industrial pollutants (SO₂/NOx/Cl⁻)
UV irradiance
Humidity / dew
Thermo-humidity cycle
Abrasion / cleaning
Transport damage
Maintenance & life

C2 sheltered / rural ESS finish scene (demo) — **C2 low** Rural / sheltered

Environment: Low pollution · indoor-ish
Pretreatment: Degrease · light conversion
System: Powder single coat
DFT: 80–120 µm
Validation: Adhesion · gloss
Maintenance: Wash · touch-up

C3 urban / light industrial ESS finish scene (demo) — **C3 medium** Urban / light industrial

Environment: Moderate SO₂ / humidity
Pretreatment: Sa 2 · Zr conversion
System: Epoxy primer + PU
DFT: 100–140 µm
Validation: Salt 480 h demo
Maintenance: Annual inspect

C4 coastal industrial ESS finish scene (demo) — **C4 high** Industrial / coastal edge

Environment: High industrial / coastal edge
Pretreatment: Sa 2½ · Zr conversion
System: Zinc epoxy + PU
DFT: 120–160 µm
Validation: Salt 720–1000 h
Maintenance: Stripe coat plan

C5-M marine / heavy industrial ESS finish scene (demo) — **C5-M marine** Marine / heavy industrial

Environment: Salt fog · heavy industrial
Pretreatment: Sa 2½ · Zn-rich prep
System: Multi-coat barrier
DFT: 160–220 µm
Validation: Salt ≥1000 h demo
Maintenance: Enhanced repair kit

Substrate & pretreatment: cleaning, profile and conversion start coating life

Demo data

Selectable substrates

Galvanized steel (GI)
Carbon steel (CRS)
Stainless (SUS)
Aluminum alloy (Al)

Degrease / rinse Oil removal
Blast (Sa 2.5) Surface roughening
Zr conversion Film for adhesion
DI rinse Ion removal
Dry-off Low residual moisture

Critical controls

Cleanliness: oil- and dust-free
Roughness: Rz 40–80 μm
Conversion film: 0.2–1.0 μm
Surface conductivity: < 10 μS/cm
Residual ions: Cl⁻ < 30 ppm

Coating system comparison: choose by environment target, not price

Demo data

Powder (polyester)

Epoxy Zn-rich primer + polyester powder

100–160 μm $$
Liquid (multi-coat)

Zn-rich primer + epoxy mid + PU topcoat

160–240 μm $$$
Duplex (HDG + powder)

Galvanize + epoxy primer + powder

100–150 μm $$
Stainless / passivation

Passivation / electropolish

— $$$$

System type	Typical build	Corrosion (C4)	Weather / UV	Texture / appearance	Repairability	Process control	Typical DFT	Total cost of ownership
Powder (polyester)	Epoxy Zn-rich primer + polyester powder	★★★★☆	★★★★☆	★★★★☆	★★★★☆	★★★★☆	100–160 μm	$$
Liquid (multi-coat)	Zn-rich primer + epoxy mid + PU topcoat	★★★★☆	★★★☆☆	★★★★☆	★★★★☆	★★★★☆	160–240 μm	$$$
Duplex (HDG + powder)	Galvanize + epoxy primer + powder	★★★★★	★★★★☆	★★★★☆	★★★★☆	★★★★☆	100–150 μm	$$
Stainless / passivation	Passivation / electropolish	★★★★★	★★★★★	★★★★☆	★★★☆☆	★★☆☆☆	—	$$$$

Color · gloss · texture: brand, heat and maintainability together

Demo data

Industrial neutrals (primary)

RAL 7035 Light grey
RAL 7032 Pebble grey
RAL 7040 Window grey
RAL 9002 Grey white
RAL 9006 White aluminum
RAL 9007 Grey aluminum
RAL 7021 Black grey
RAL 9005 Jet black

Brand accents (area ≤ 10%)

RAL 5012 Sky blue
RAL 5017 Traffic blue
RAL 2004 Pure orange
RAL 6005 Moss green

Gloss & texture (60° GU)

Low ≤10 Low reflection
25 ± 5 General industrial
Semi 40–60 Easy clean
High ≥80 Easy repair

Texture

Fine Uniform fine
Orange peel Medium grain
Sand Coarse grit

Engineering notes

Light tones, lower heat gain Reduce skin temperature
High-contrast safety colors Visibility and safety
Texture hides scratches Lower maintenance effort

Edge coverage

DFT ≥ 80 μm · no holidays

OK Radiused + coated

NG Knife edge bare
Weld zone

Continuous film · no burrs

OK Full stripe coat

NG Skip weld porosity
Fasteners / bolts

Compatible finish · anti-galvanic

OK Matched + sealed

NG Bare dissimilar metal
Hinges / moving parts

Wear coat · free motion

OK Free + coated

NG Paint-locked hinge
Seal compression

Intact seal face · no cracks

OK Uniform compression

NG Gap / pinch cut
Cable glands / cutouts

Edge coat window · anti-ingress

OK Full coverage

NG Bare cut edge
Drain holes

Weep paths clear

OK Open · coated bore

NG Blocked / rust trap
Field repair

Approved kit · color match

OK Feathered match

NG Unapproved spray

Sample approval workflow

Demo data

From digital to physical — lock consistency

Digital specification

Color

RAL 7035

Gloss

25 ± 5 GU

Texture

Fine

DFT

120 ± 20 μm

Target

C4 / 20 yr+

Color / gloss / texture / DFT / target
Lab sample panel

With host · color / gloss / texture
Trial cabinets

Process demo / review
Natural light / lightbox

Process demo / outdoor review
Master confirmation

Final standard piece
PPAP boundary samples

Mass-production consistency bounds