描述
MacDermid Alpha Micromax 5491B High-Thermal-Durability Black Encapsulant for Metal Plate Chip Resistors
Type: Polymer Encapsulant
Application: Metal Plate Chip Resistors
Color: Black
Shelf Life: 3 months frozen
Micromax 5491B is a polymer composition encapsulant intended for metal plate chip resistors, especially for high power and high operating temperature applications. It delivers high thermal durability, cures at 220°C for 30 minutes, and remains black prior to and after curing. It applies to metal plate chip resistors as well as thick film chip resistors. Halogen free and cadmium, lead, nickel, and phthalate free.
Micromax 5491B from MacDermid Alpha is a polymer composition encapsulant developed for encapsulation on metal plate chip resistors, especially for high power and high operating temperature applications. It is designed to maintain stability at higher operating temperatures than standard encapsulants, with a thermoset process at 220°C for 30 minutes. The cured film remains black both before and after curing, which gives a consistent appearance on the resistor body. The composition applies to metal plate chip resistors as well as thick film chip resistors, giving flexibility across resistor types. It is halogen free per IEC 61249-2-21, and cadmium, lead, nickel, and phthalate are not intentionally added.
The paste carries a viscosity range of 45–75 Pa.s and uses Micromax 9245(T) as the recommended thinner. Non-volatile content at 150°C is 83–88%. Print with a 325 mesh stainless steel screen with 10 μm emulsion and a 70 durometer squeegee to a cured thickness of 30 μm ± 5 μm. Bring the material to 20–23°C before printing. Allow prints to level for 5 minutes at room temperature, then dry for 10 minutes at 110–150°C. Cure at 220°C for 30 minutes; conditions should be optimized for the type of dryer used. Store refrigerated during transportation and at frozen temperature below −10°C after receipt. Room temperature storage is not recommended. Unopened shelf life is 3 months from date of shipment.
Genuine MacDermid Alpha Micromax Imported Stock & Technical Support
We hold regular stock of authentic MacDermid Alpha Micromax 5491B black polymer encapsulant. Original factory TDS and batch-specific COA are available on request for your metal plate chip resistor programs.
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Complete TDS, COA, and regulatory documentation available
Key Features of MacDermid Alpha Micromax 5491B
- Polymer composition encapsulant for metal plate chip resistors
- Designed for high power and high operating temperature applications
- High thermal durability for demanding environments
- Thermoset process at 220°C for 30 minutes
- Black color prior to and after curing for consistent appearance
- Applicable on metal plate chip resistors and thick film chip resistors
- Halogen free per IEC 61249-2-21
- Cadmium, lead, nickel, and phthalate free (no intentional addition)
- Viscosity 45–75 Pa.s for consistent screen printing
- Non-volatile content at 150°C: 83–88%
- Screen: 325 mesh stainless steel, 10 μm emulsion, 70 durometer squeegee
- Cured thickness 30 ± 5 μm; freezing storage below −10°C
Primary Applications
- Metal plate chip resistor encapsulation — especially for high power and high operating temperature
- Thick film chip resistor encapsulation — also compatible with thick film chip resistors
- High temperature operating circuits — where thermal durability matters
- Black-body resistor encapsulation — consistent appearance before and after curing
Full Technical Specifications
| Property | Typical Value | TDS Reference |
| Product Type | Polymer encapsulant composition | TDS: Polymer Encapsulant Composition |
| Application | Encapsulant | TDS: Encapsulant |
| Color | Black | TDS: Black |
| Solvent or Thinner | Micromax 9245(T) | TDS: Micromax 9245(T) |
| Viscosity | 45 to 75 Pa.s | TDS: Brookfield HAT, #14 spindle & UC, 10 rpm, 25°C |
| Non-Volatile Content (150°C) | 83 to 88 % | TDS: Non-Volatile (150°C): 83-88% |
| Printing Screen | 325 mesh stainless steel, 10 μm emulsion, 70 durometer squeegee | TDS: 325 mesh, 10 μm, 70 durometer |
| Cured Thickness | 30 ± 5 μm | TDS: 30 μm ± 5 μm |
| Printing Room Temperature | 20 to 23 °C | TDS: 20-23°C |
| Leveling Time | 5 minutes at room temperature | TDS: 5 minutes |
| Drying Schedule | 10 minutes at 110–150°C | TDS: 110-150°C for 10 min |
| Curing Schedule | 220°C for 30 minutes | TDS: 220°C for 30 min |
| Thermal Durability | High | TDS: Product benefits |
| Color After Curing | Black | TDS: Product benefits |
| Halogen Free | Yes (per IEC 61249-2-21) | TDS: Product benefits |
| Cadmium, Lead, Nickel, Phthalate Free | Yes (no intentional addition) | TDS: Product benefits |
| Shelf Life | 3 months | TDS: 3 months |
| Storage Temperature | Frozen at < -10 °C after receipt | TDS: < -10°C |
Note: All listed values are typical and may vary by batch. Values based on MacDermid Alpha official TDS. Independent qualification testing is required prior to production use. "Halogen free" per IEC 61249-2-21; trace amounts may be present. "Cadmium, Lead, Nickel and Phthalate free" as used herein means these substances are not intentional ingredients and are not intentionally added. Trace amounts may be present.
Recommended Processing Conditions
| Parameter | Recommended Value | TDS Reference |
| Mixing Prior to Use | Slow, gentle hand stirring 1–2 minutes with a clean burr-free flexible plastic spatula; avoid air entrapment | TDS: 1-2 minutes |
| Room Temperature Before Printing | 20 to 23 °C | TDS: 20-23°C |
| Screen Mesh | 325 mesh stainless steel, 10 μm emulsion, 70 durometer squeegee | TDS: 325 mesh, 10 μm, 70 durometer |
| Cured Thickness | 30 ± 5 μm | TDS: 30 μm ± 5 μm |
| Leveling | 5 minutes at room temperature | TDS: 5 minutes |
| Drying | 110–150°C for 10 minutes | TDS: 110-150°C for 10 min |
| Curing | 220°C for 30 minutes | TDS: 220°C for 30 min |
| Thinning | Not normally required; Micromax 9245(T) for minor adjustment | TDS: Micromax 9245(T) |
| Clean-up Solvent | Micromax 9245(T) | TDS: Micromax 9245(T) |
Handling and Storage Recommendations
| Storage Rules | Keep product refrigerated during transportation and stored at frozen temperature below -10°C after receipt. Storage at room temperature is not recommended. | TDS: frozen temperature (< -10°C) |
| Shelf Life | 3 months in unopened containers from date of shipment. | TDS: 3 months |
| Ageing Behavior | Gradual polymerization with viscosity increase and mechanical separation can be expected over a few months. | TDS: Storage and shelf life |
| Frozen Handling | Allow material to equilibrate to room temperature before opening to prevent moisture pickup from condensation. | TDS: Storage and shelf life |
| Transportation | Refrigerated transportation recommended. For extended transport periods, confirm product suitability. | TDS: Transportation |
Official Technical Documentation
| Document Type | Document Introduction | Document Request |
| TDS | MacDermid Alpha Micromax 5491B original factory technical data sheet | Request TDS |
| COA | Batch-specific certificate of analysis | Request COA |
| SDS | Safety Data Sheet for handling and storage | Request SDS |
Frequently Asked Questions
Why is 5491B suited to metal plate chip resistors?
The TDS states that 5491B is intended for encapsulation on metal plate chip resistors, especially for high power and high operating temperature applications. Its high thermal durability and 220°C curing schedule make it suitable for these demanding conditions.
Why does 5491B cure at 220°C instead of 180–200°C?
The higher curing temperature supports high thermal durability, which is the key requirement for metal plate chip resistors in high power and high operating temperature applications. The TDS specifies 220°C for 30 minutes.
Is 5491B halogen free?
Yes. The TDS states that 5491B is halogen free as defined in industry standard IEC 61249-2-21. Trace amounts may be present.
What color is 5491B before and after curing?
The TDS lists black color prior to and after curing as a product benefit. Keeping the same color before and after curing helps maintain consistent appearance on the resistor body.
What is the cured thickness of 5491B?
Cured thickness is 30 μm ± 5 μm. This is achieved with a 325 mesh stainless steel screen, 10 μm emulsion thickness, and a 70 durometer squeegee.
How should 5491B be stored?
Keep refrigerated during transportation and store at frozen temperature below −10°C after receipt. Room temperature storage is not recommended. Unopened shelf life is 3 months. Allow the material to equilibrate to room temperature before opening to prevent moisture pickup from condensation.
What is the non-volatile content of 5491B?
Non-volatile content measured at 150°C is 83–88%. This is higher than many solvent-based encapsulants, which supports thicker films at the specified cured thickness.
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We supply authentic MacDermid Alpha Micromax 5491B black polymer encapsulant for metal plate chip resistor programs. Contact our team for bulk quotations, sample availability, technical documentation, and application support.
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Disclaimer: All technical data on this page are for general guidance only and are not product specifications. Buyers must carry out independent trials and verify suitability before bulk ordering. Actual values may vary between production lots. "Halogen free" per IEC 61249-2-21; trace amounts may be present. "Cadmium, Lead, Nickel and Phthalate free" as used herein means these substances are not intentional ingredients and are not intentionally added. Trace amounts may be present.
