Humiseal 2A53 | Two-Part Epoxy Conformal Coating

Main features

Strong resistance to solvents
Industry compliant
Visual quality control with UV tracer

Product Description

HumiSeal® 2A53 is a two component epoxy conformal coating supplied as Parts A and B, suitable for general printed circuit boards and applications where exceptional resistance to solvents or other chemicals is required. HumiSeal® 2A53 fluoresces under UV light for inspection purposes. 2A53 coating is MIL-I-46058C qualified and IPC-CC-830 and RoHS Directive 2002/95/EC compliant.

Product Key Features

Offers strong resistance to solvents and other chemicals, making it ideal for harsh environments.
The coating glows under UV light, which allows for easy inspection and quality control.
Meets several important industry standards, including MIL-I-46058C, IPC-CC-830, and RoHS Directive 2002/95/EC.

Target applications

PCB encapsulation/potting of components and connectors
Vibration damping and stress relief around delicate parts (soft gel, Shore 00)
Moisture/environmental protection for control modules and sensors
Gap‑fill around wiring and terminations prior to enclosure close‑out

Product Family
HS-2A53

1. Select Package Type

1L Can

Catalog Product

Unlike other products we offer, the products listed on this page cannot currently be ordered directly from the website.

Shortest leadtime

Shipping in 8 weeks

Contact for Pricing

Packaging

TDS, SDS & Technical documents

Specifications
Additional Information

Technical Specifications

General Properties

Density (g)

0.93 g/cm3

Solids

54 %

Thermal Properties

Glass Transition Temperature (Tg)

Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding.

The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.

19 °C

Operating Temperature

-65 - 125 °C

Coefficient of Thermal Expansion (CTE)
Coefficient of Thermal Expansion (CTE), α1 Coefficient of Thermal Expansion (CTE), α1 CTE α1 (alpha 1) is the slope of the Coefficient of thermal expansion in a temperature range below the Glass transition temperature (Tg). It explains how much a material will expand until it reaches Tg.	56 ppm/°C

Electrical Properties

Breakdown Voltage

Breakdown Voltage
Breakdown voltage is the minimum voltage necessary to force an insulator to conduct some amount of electricity.
It is the point at which a material ceases to be an insulator and becomes a resistor that conducts electricity at some proportion of the total current.

After dielectric breakdown, the material may or may not behave as an insulator any more because of the molecular structure alteration. The current flow tend to create a localised puncture that totally alters the dielectric properties of the material.

This electrical property is thickness dependent and is the maximum amount of voltage that a dielectric material can withstand before breaking down. The breakdown voltage is calculated by multiplying the dielectric strength of the material times the thickness of the film.

8000 V

Dissipation Factor
Dissipation Factor @ 25°C /1000 kHz	0.03

Dielectric Constant
Dielectric Constant @ 1000 kHz	3.0

Mechanical Properties

Storage (DMA) Modulus
Storage (DMA) Modulus @ 25°C	32.2 N/mm2

Additional Information

Frequently Asked Questions About HumiSeal® 2A53

What are typical applications for HumiSeal® 2A53?

HumiSeal® 2A53 is a two-component epoxy conformal coating specifically designed to protect printed circuit boards (PCBs) and electronic assemblies. It provides a hard, durable layer with exceptional resistance to solvents, moisture, and other harsh chemicals, making it ideal for applications requiring robust environmental protection.

General PCB coating for environmental protection
Applications requiring high resistance to solvents and chemicals
Protecting electronic assemblies in demanding environments

Why choose HumiSeal® 2A53 over alternatives?

As a two-component epoxy, it provides a hard, tough coating that is highly resistant to solvents and chemicals. It cures at room temperature or with mild heat, offering flexibility in processing. A key feature is its UV fluorescence, which allows for quick and accurate inspection of the coating to ensure complete coverage and quality.

What is the shelf life of HumiSeal® 2A53?

12 months from date of manufacture when stored in tightly closed containers at 25°C. For specific storage instructions, refer to the product's technical data sheet.

How do I clean tools after applying HumiSeal® 2A53?

Use HumiSeal® Thinner 535 for clean-down of equipment. Cured material is highly resistant and requires a strong solvent for removal.

What happens after shelf life?

Material may exhibit changes in viscosity, cure speed, or final properties. Do not use beyond the stated shelf life without re-qualification to ensure performance.

How do I cure HumiSeal® 2A53?

The product cures at room temperature. A typical full cure is achieved after 24 hours at room temperature, although a heat cure can accelerate this process. Refer to the TDS for specific time and temperature guidelines.

What thickness should I apply?

The recommended dry film thickness is typically 50-75 microns (2-3 mils). Ensure the substrate is clean and free of contaminants before application to achieve proper adhesion.

How is it applied and removed?

HumiSeal® 2A53 can be applied by spraying, dipping, or brushing. Due to the cured material's hardness and chemical resistance, it is difficult to remove. Mechanical methods or strong chemical strippers are required for rework.

What temperatures can it withstand?

The coating offers excellent thermal stability. The continuous operating temperature ranges from -65°C to 125°C. Consult the TDS for details on its performance at various temperatures.

Any safety or storage tips?

Use in well-ventilated areas. Avoid skin/eye contact. Store in sealed containers away from heat and direct sunlight. Review the Safety Data Sheet (SDS) before use for comprehensive safety information.

What are the key material properties?

Appearance: Part A and Part B are clear to yellow; provides a clear, transparent film when cured
Hardness: Durable, tough, and solvent-resistant film
Solids: ~54% solids by weight
Compliance: MIL-I-46058C, IPC-CC-830, and RoHS Directive 2002/95/EC compliant

Is it compatible with metals and coatings?

Epoxy coatings are generally compatible with common PCB materials. Always test for adhesion and compatibility on representative substrates before full-scale application.

Learn More About HumiSeal® 2A53

HumiSeal® 2A53 is a two-component epoxy conformal coating that delivers robust protection for electronic assemblies. Its hard, durable film offers exceptional resistance to solvents, chemicals, and moisture, making it a reliable choice for demanding applications. The coating's UV fluorescence simplifies quality control by enabling quick inspection under a blacklight to verify complete coverage.

Key Features at a Glance

✔ Two-component epoxy formulation
✔ Cures at room temperature or with mild heat
✔ Exceptional chemical and solvent resistance
✔ UV fluorescent for easy inspection
✔ Compliant with MIL-I-46058C, IPC-CC-830, and RoHS

Versatile Application Methods 🧰

Application Methods

HumiSeal® 2A53 can be applied using conventional methods like spraying, brushing, or dipping. Its low viscosity ensures excellent wetting and uniform coverage of complex PCB geometries.

Application Methods:

Spray: Using conventional spray equipment
Brush: For precise application or touch-ups
Dip: For complete encapsulation of assemblies

Mix Part A and Part B according to the product's specific ratio until homogenous.

Curing Options: Cures at room temperature; heat can be used to accelerate the process. Refer to the TDS for cure schedule details.

Application Compatibility

Compatible with a wide range of PCB materials and component types when surfaces are properly cleaned and prepared:

PCB assemblies and modules
Areas exposed to harsh chemicals
Applications requiring high environmental resistance

The UV tracer allows quick, accurate inspection to verify full coverage and quality control.

High-Performance Electrical Protection 🧪

HumiSeal® 2A53 provides excellent electrical insulation, protecting sensitive circuitry from environmental factors. Its durable, hard coating prevents mechanical and chemical damage.

Inspection Made Easy 💡

To simplify quality assurance, HumiSeal® 2A53 fluoresces under UV light, making it easy to confirm proper coating coverage during post-application inspection—an essential feature for high-reliability electronics manufacturers.

Repairable and Reworkable 🔁

Given its hard, durable nature, removing HumiSeal® 2A53 for rework is challenging and requires a strong solvent-based stripper or mechanical removal. Always follow proper safety protocols when removing the coating.

Reliable Across Environments 🌍

The epoxy chemistry provides a durable, hard film with excellent resistance to a wide range of chemicals and environmental conditions, ensuring long-term protection for your electronic assemblies.