HUMISEAL 1B73/521
Harmonization Code : 3404.90.00.00 | Artificial waxes and prepared waxes : Other
Main features
- Ready for Automated Spray Processing
- 30-Minute Handling Time
- 50-Cycle -65 to 125 deg C Thermal Shock
Product Description
HumiSeal® 1B73/521 PB25 Acrylic Conformal Coating is a fast-drying, single-component acrylic conformal coating pre-blended to 25 ± 5 cP for automated spray equipment without additional thinning. Intended for printed circuit assemblies, it combines flexibility, UV fluorescence for inspection, and practical repairability with a recommended dry-film thickness of 25–75 µm. Typical handling dry time is 30 minutes, with recommended cure conditions of 24 hours at room temperature or 2 hours at 76°C and seven days to reach optimum properties. The cured coating also has documented thermal-shock, electrical-insulation, dielectric, and fungus-resistance performance.
Key features
- Ready-to-spray pre-blend: Formulated at 25 ± 5 cP for automated spray equipment without additional thinning.
- Single-component acrylic coating: Designed for conformal coating of printed circuit assemblies.
- Fast handling dry: Typical drying time to handle is 30 minutes.
- UV inspection and repair: Fluoresces under UV light for coating inspection and is easily repaired.
- Controlled coating thickness: Recommended dry-film thickness is 25–75 µm.
- Documented cured performance: Includes thermal-shock, dielectric, insulation-resistance, and fungus-resistance data.
Applications / Suitable for
- Automated spray conformal coating of printed circuit assemblies
- PCB coating processes requiring UV-assisted inspection
- Repairable acrylic conformal coating applications
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Thermal Properties
Electrical Properties
Physical Properties
Additional Information
HumiSeal® 1B73/521 PB25 Acrylic Conformal Coating
HumiSeal 1B73/521 PB25 is a single-component acrylic conformal coating pre-blended for automated spray application without additional thinning. It provides fast handling, UV-fluorescent inspection, repairability, controlled 25–75 µm dry-film application, and documented electrical and thermal performance for printed circuit assemblies.
As-Supplied Properties
Typical exact-product liquid-coating data. Values are representative and are not specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Product type | Single-component acrylic conformal coating | — | Pre-blended for automated spray application |
| Density | 0.90 ± 0.02 | g/cm³ | ASTM D1475 |
| Solids content | 15 ± 1 | % by weight | Fed-Std-141, Method 4044 |
| Viscosity | 25 ± 5 | cP | Fed-Std-141, Method 4287 |
| VOC | 760 | g/L | As reported in the exact-product technical data sheet |
| Shelf life | 24 | months | At room temperature from date of manufacture |
Application and Cure
HumiSeal 1B73/521 PB25 is formulated for automated spray equipment without additional thinning. Successful coating depends on clean, dry assemblies, controlled spray conditions, appropriate ventilation, and compliance with the documented thickness and cure requirements.
Store HumiSeal 1B73/521 PB25 in tightly closed containers away from excessive heat or cold. HumiSeal products may be stored at 0–35°C; before use, allow the coating to equilibrate for 24 hours at 18–32°C. The documented shelf life is 24 months from the date of manufacture at room temperature. The solvent-containing coating is flammable, so application should follow the current Safety Data Sheet and applicable ventilation, ignition-control, personal-protection, storage, and disposal requirements.
Cured Coating Properties
Typical cured-coating data. Preserve the listed test method and condition when comparing or specifying performance.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Thermal shock | 50 cycles | — | MIL-I-46058C; -65°C to 125°C |
| Coefficient of thermal expansion | 67 | ppm/°C | TMA |
| Glass transition temperature | 42 | °C | DSC |
| Modulus | 11.1 | MPa | DMA |
| Dielectric withstand voltage | >1500 | V | MIL-I-46058C |
| Dielectric breakdown voltage | 6300 | V | ASTM D149 |
| Dielectric constant | 2.6 | — | 1 MHz and 25°C; ASTM D150-98 |
| Dissipation factor | 0.01 | — | 1 MHz and 25°C; ASTM D150-98 |
| Insulation resistance | 5.5 × 10¹⁴ | Ω | MIL-I-46058C; 550 TΩ |
| Moisture insulation resistance | 7.0 × 10¹⁰ | Ω | MIL-I-46058C; 70 GΩ |
| Fungus resistance | Passes | — | ASTM G21 |
RoHS: HumiSeal's Acrylic Conformal Coatings RoHS certificate lists 1B73 preblends as compliant with Directive 2015/863/EU.
Applications
HumiSeal 1B73/521 PB25 is intended for printed circuit assemblies and is specifically formulated for automated spray application. Use should remain within the documented cleanliness, humidity, thickness, cure, inspection, and safety conditions.
HumiSeal Acrylic Conformal Coatings RoHS Certificate
The HumiSeal acrylic-coatings certificate identifies 1B73 preblends as compliant with RoHS Directive 2015/863/EU. Use the document to review the listed restricted-substance thresholds and covered acrylic coating families.
Technical Support
Work with Krayden to evaluate HumiSeal 1B73/521 PB25 against your automated spray equipment, PCB materials, target dry-film thickness, cure schedule, inspection method, rework requirements, and operating environment. Krayden can help coordinate application trials, process optimization, sampling, and technical support.
