solar thermal mirror Back Coatings｜BASTAIN BACOAT

Applied directly to copper/copper-free silver mirror back. IR cured. Total DFT 90-102μm.

Recommended System

→ BACOAT MR-1590 Redprimer 30-34μm
→ BACOAT MA-1591 Light Gray Intermediate Coat 30-34μm
→ BACOAT MW-1592 White topcoat 30-34μm

Model	Color	Dry Film Thickness	IR Cure
MR-1590	Red	25-35 μm	80-120℃ · 1.5-2 min
MA-1591	Light Gray	25-35 μm	140-150℃ · 3-4.5 min
MW-1592	White	30-40 μm	165-185℃ · 4 min

Application method: Flow coating (curtain 60-70°) · Thinner M-002 · Viscosity TU-4 cup 41-50s · Line speed 4 m/min

Internal lab report 23SH Lab T0010, 2023.10 - 2024.03, substrate silver mirror + copper mirror.

Test Results

Test Item	standard	Result
Pencil hardness	ASTM D3363	2H
adhesion	ASTM D3359 / GB/T 9286	Grade 1
Boiling resistance	Boiling water 2h	no change
Acid resistance	10% HCl · 72h	no change
Alkali resistance	10% NaOH · 72h	no change
Xylene resistance	100 cycles	PASS
CASS copper-accelerated acetic acid salt spray	ISO 9227 / EN 1036	no change
gloss	ASTM D523	30-40%
Composite film thickness	ASTM D1005	90-102 μm

Conclusion: All items meet or exceed DIN-EN-1036; Q-Sun weathering and NSS medium-performance salt spray continuous testmedium.

Validated on CSP heliostat/trough mirror production flow-coating line. Line speed 4 m/min.

Process Parameters

Process Step	Pre-flow-coat Panel Temp	Oven Peak Temperature	Exit Panel Temp	film thickness
primer MR-1590	45℃	125℃ · 2min	62℃	30-34μm
Medium paint MA-1591	38℃	145℃ · 3-4min	113℃	30-34μm
topcoat MW-1592	50℃	170℃ · 5-6min	120℃	30-34μm

Per batch 150kg, M-002 diluted 20%, self-circulating epoxy 2h, curtain stable no cross.

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