3-/4-/5-Proof Conformal Coatings | Protection Levels and Applications
The classifications reflect GTA product positioning. Actual protection performance depends on the application environment and test conditions.
3-Proof Coating
Protection against moisture, dust, and chemical liquids
General industrial / indoor equipment
AK-H00 / AM-300 / AA-G00
4-Proof Coating
Adds salt-spray protection to the 3-proof foundation
Coastal / high-humidity / salt-spray environments
AK-H01 / AM-301 / AA-G01
5-Proof Coating
Adds resistance to sulfidation to the 4-proof foundation
Industrial pollution / marine / outdoor 5G environments
AL-102
3-/4-/5-Proof Coatings | Application Gallery
From indoor electronics to humid coastal environments and industrial pollution, select coating solutions according to the required protection.
01 | 3-Proof Coating
Essential Circuit Protection
Protection against moisture, dust and exposure to certain chemicals, suited to indoor electronics, industrial controls and data-center equipment.
Representative grades: AK-H00／AM-300／AA-G00
02 | 4-Proof Coating
Enhanced Salt-Spray Protection
Builds on 3-proof protection with consideration for salt-spray exposure, suited to coastal control systems, outdoor communication equipment and high-humidity environments.
Representative grades: AK-H01／AM-301／AA-G01
03 | 5-Proof Coating
Protection in Sulfidation-Prone Environments
Adds sulfidation-resistance requirements to 4-proof protection, suited to circuits exposed to higher risks from industrial pollution and corrosive gases.
Representative grades: AL-102
Note: Images are conceptual application illustrations. Depicted containers, packaging sizes and application methods do not represent actual supply specifications. Material selection and protection performance must be verified under actual conditions and against the latest TDS.
Three Material Technology Platforms
Material systems and protection levels are separate considerations. Evaluate both alongside processing conditions and contamination control.
Solvent-Free UV
100% active content; cured by 365 nm UV, suitable for fast production cycles and reduced solvent use.
AK-H00 / AK-H01
Silicone-Free / No Silicone Oil
A candidate material for applications where silicone contamination is a concern; suitability still requires process validation.
AM-300 / AM-301 / AL-102
Silicone-Based
Offers a flexible material option for humid environments; substrate compatibility must be evaluated.
AA-G00 / AA-G01
Seven Representative Grades | Quick Selection Guide
Select the protection level first, then choose a grade based on the material system and application process.
| Protection Level | Material Platform | Grade | Suggested Applications |
|---|---|---|---|
| 3-Proof | Solvent-Free UV | AK-H00 | UV curing / indoor industrial equipment |
| 3-Proof | Silicone-Free | AM-300 | Precision electronics / silicone contamination control |
| 3-Proof | Silicone-Based | AA-G00 | Humid environments / flexibility requirements |
| 4-Proof | Solvent-Free UV | AK-H01 | Fast coating / salt-spray exposure risk |
| 4-Proof | Silicone-Free | AM-301 | Coastal and humid environments / silicone contamination control |
| 4-Proof | Silicone-Based | AA-G01 | Coastal and humid environments / flexibility requirements |
| 5-Proof | Silicone-Free, High Corrosion Resistance | AL-102 | Industrial sulfidation / highly polluted environments |
Product Specifications | 3-Proof, 4-Proof and 5-Proof Coatings
3-Proof Coatings | Material and Curing Properties
| Test Item | AK-H00 | Solvent-Free UV | AM-300 | Silicone-Free | AA-G00 | Silicone-Based |
|---|---|---|---|
| Viscosity (mPa·s) | 50 | 750 | 800 |
| Active Content (%) | 100 | 35 ± 2 | 65 ± 2 |
| Drying / Curing Conditions | 365 nm UV; 4 J/cm² | 25°C / 50%RH; 24 h | 25°C / 50%RH; 24 h |
| Tack-Free Time (min) | 1 | 15 | 30 |
| Water Contact Angle (°) | 102 | 99 | 99 |
| Dielectric Strength (kV/mm) | 14 | 14 | 15 |
| Thermal Shock (cycles) | 100 | 100 | 100 |
Note: All grades in this table have a volume resistance of > 10¹³ Ω and a UL 94 flammability classification of V-0. Refer to the latest Technical Data Sheet (TDS) for each product for the applicable test conditions and classification criteria.
4-Proof Coatings | Material and Curing Properties
| Test Item | AK-H01 | Solvent-Free UV | AM-301 | Silicone-Free | AA-G01 | Silicone-Based |
|---|---|---|---|
| Viscosity (mPa·s) | 60 | 800 | 850 |
| Active Content (%) | 100 | 37 ± 2 | 67 ± 2 |
| Drying / Curing Conditions | 365 nm UV; 4 J/cm² | 25°C / 50%RH; 24 h | 25°C / 50%RH; 24 h |
| Tack-Free Time (min) | 1 | 15 | 30 |
| Water Contact Angle (°) | 102 | 99 | 99 |
| Dielectric Strength (kV/mm) | 14 | 14 | 15 |
| Thermal Shock (cycles) | 100 | 100 | 100 |
Note: All grades in this table have a volume resistance of > 10¹³ Ω and a UL 94 flammability classification of V-0. Refer to the latest Technical Data Sheet (TDS) for each product for the applicable test conditions and classification criteria.
5-Proof Coating | AL-102 Key Specifications
| Test Item | AL-102 |
|---|---|
| Material System | Silicone-free, high-corrosion-resistance formulation |
| Viscosity | 300 mPa·s |
| Density | 0.91 g/mL |
| Active Content | 30% |
| Drying Conditions | 25°C / 50%RH; 24 h |
| Tack-Free Time | 20 min |
| Water Contact Angle | 85° |
| Dielectric Strength | 13 kV/mm |
| Volume Resistivity | >10¹³ Ω·cm |
| Thermal Shock | 100 cycles |
Note: This grade has a volume resistivity of >10¹³ Ω·cm and a UL 94 flammability classification of V-0. Refer to the latest Technical Data Sheet (TDS) for the applicable test conditions and classification criteria.
Comparative Testing | Salt-Spray and Sulfidation Resistance
Salt-Spray Resistance | Copper Coupon Comparison
Conditions: Salt-spray exposure at 35°C for 108 h; copper coupons with approximately 30–40 μm coating thickness. GTA 4-proof coating specimens: PASS; comparison materials: NG.
Sulfidation Resistance | Specimen Comparison
Conditions: Sulfur vapor exposure at 105°C for 80 h; 25 μm coating / evaporated silver layer / 75 μm PET. GTA 5-proof coating specimens: PASS; comparison materials: NG.
Third-Party Testing and Application Support
Third-party test documentation from DEKRA iST is available for Flower of Sulfur (FOS) and Mixed Flowing Gas (MFG) testing. Tested grades, methods, report versions, and conclusions are subject to the original reports, which may be provided upon customer request.
Typical Applications
Indoor Industrial / Data Center
High-density PCBs, power supplies, and control boards
Recommended: 3-Proof Coating
Coastal and High-Humidity Equipment
Coastal equipment rooms, port equipment, and electrical control enclosures
Recommended: 4-Proof Coating
Outdoor / 5G Telecommunications
Outdoor communication boards and base-station modules
Recommended: 4-Proof / 5-Proof Coatings
Industrial Pollution / Sulfidation Risk
Industrial zones, wastewater treatment facilities, and corrosive-gas environments
Recommended: 5-Proof Coating
Packaging and Technical Consultation
Current website packaging options include 1 kg and 4 kg. Actual available packaging and minimum order quantities must be confirmed for each grade. GTA can assist with material selection and validation based on PCB structure, coating thickness, drying/curing method, material compatibility, and reliability requirements.
Note: The above data represent typical test results and do not constitute guaranteed shipping specifications. Actual product specifications are subject to the latest Technical Data Sheet (TDS) for each grade.
