Humiseal UV20GEL | High Performance Staking and Vibration Protection UV Gel

Harmonization Code : 3208.20.90 | Paints and varnishes that are dispersed or dissolved in a non aqueous medium

Humiseal UV20GEL | High Performance Staking and Vibration Protection UV Gel

Main features

Thixotropic Gel Consistency
Fast UV Cure
Shadow Area Cure

Product Description

HumiSeal® UV20GEL is a fast curing, non-sag thixotropic paste which cures to give a flexible urethane acrylate that bonds well to engineered plastics and metal-based substrates. In addition to the UV cure, this material has a secondary moisture cure mechanism to ensure cure in areas shadowed from UV light. HumiSeal®UV20GEL is designed for staking and vibration dampening applications, but doubles as a high-performance adhesive for general PCB bonding applications.

HumiSeal® UV20GEL is engineered to meet stringent industry specifications, including RoHS, REACH, and GB 33372-2020. It is compatible for use with Humiseal UV curable conformal coatings.

Product Key Features

Sag-resistant & thixotropic formulation
Fast UV cure with secondary moisture cure mechanism for shadow areas
UV flourescent for easy inspection

Target Applications

General printed circuit board applications requiring mechanical & vibration portection
Plastic bonding
PET/RPET clamshell bond
Components staking

Compatible Substrates

HumiSeal® UV20GEL is compatible for use on PC, PET/RPET, PVC, and PCB components.

Specifications
Additional Information

Technical Specifications

General Properties

Appearance

Appearance
Appearance at room temperature.

Opaque white

Density (g)

1.08 g/cm3

Solids

100 %

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.

31 °C

Operating Temperature

-40 - 125 °C

Coefficient of Thermal Expansion (CTE)
Coefficient of Thermal Expansion (CTE), α2 Coefficient of Thermal Expansion (CTE), α2 CTE α2 (alpha 2) is the slope of the Coefficient of thermal expansion in a temperature range above the Glass transition temperature (Tg). It explains the extent to which a material will expand after it passes Tg.	239 ppm/°C

Electrical Properties

Surface Resistivity

1.4e 12 Ohms/sq

Volume Resistivity

Volume Resistivity
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.

8.5e 13 Ohms⋅cm

Mechanical Properties

Tensile Strength
Tensile Strength Tensile Strength Tensile strength determines the resistance of a material to break under tension and it measures how much elongating load (or tensile stress) it can handle before fracture. To make it simple, it measures how much force we have to apply when pulling apart a material before it breaks.	4.8 MPa

Hardness
Durometer (Shore A)	60

Physical Properties

Thixotropic index

Thixotropic index
Thixotropic Index is a ratio of a material s viscosity at two different speeds in Ambient temperature, generally different by a factor of ten.

A thixotropic material s viscosity will decrease as agitation or pressure is increased. It indicates the capability of a material to hold its shape. Mayonnaise is a great example of this. It holds its shape very well, but when a shear stress is applied, the material easily spreads.

It helps in choosing a material in accordance to the application, dispense method and viscosity of a material.

5.5

Additional Information

Frequently Asked Questions About HumiSeal® UV20GEL

What are typical applications for HumiSeal® UV20GEL?

HumiSeal® UV20GEL is ideal for protecting printed circuit board assemblies (PCBs) or for spot coating applications. Its non-sagging thixotropic consistency makes it suitable for:

Automotive electronics (e.g., control units, under-the-hood components)
Industrial electronics (e.g., ruggedized controls, sensors)
Aerospace and defense electronics (e.g., modules, high-reliability assemblies)

Its fast UV cure and robust chemical resistance make it perfect for protecting sensitive components, especially where a thick or precise coating is required with a quick throughput.

Why choose HumiSeal® UV20GEL over other conformal coatings?

HumiSeal® UV20GEL is a single-component, urethane acrylate-based gel that provides excellent chemical and environmental resistance. It offers a thixotropic (non-flowing) consistency for applications like dam-and-fill, encapsulating components, or creating a specific high-build protective layer. Its main advantage is its rapid UV cure, which allows for a full cure in seconds, significantly accelerating production times. The gel fluoresces under UV light for easy inspection of coverage. It is applied by dispensing, syringe, or hand-applied methods, offering flexibility for various production processes. It also has a secondary moisture cure mechanism for areas not exposed to UV light.

What is the shelf life of HumiSeal® UV20GEL?

HumiSeal® UV20GEL has a shelf life of 6 months from the date of manufacture when stored sealed at room temperature (1 to 25°C). Before use, allow the product to reach room temperature for optimal dispensing performance.

How should I clean tools after applying HumiSeal® UV20GEL?

To clean uncured HumiSeal® UV20GEL from tools, use a suitable solvent like acetone or an ester-based solvent. For cured material, a mechanical method is often required. Always ensure proper ventilation and use appropriate protective equipment. Consult the product's Technical Data Sheet (TDS) and Safety Data Sheet (SDS) for detailed recommendations.

What happens to HumiSeal® UV20GEL after its shelf life?

After the shelf life, viscosity and curing characteristics may degrade, potentially leading to inconsistent dispensing or reduced protective performance. Use of expired material is not recommended as it may compromise coating quality.

How do curing times vary for HumiSeal® UV20GEL?

The primary cure for HumiSeal® UV20GEL is UV light, which cures the coating in seconds to a few minutes depending on the UV intensity and thickness. A secondary moisture cure is active for areas that are shadowed from UV exposure, typically achieving a full cure in 7 to 10 days, depending on ambient humidity.

What is the recommended thickness for HumiSeal® UV20GEL?

Due to its thixotropic nature and fast UV cure, HumiSeal® UV20GEL is designed for applications where high-build or encapsulated thicknesses are required. This is significantly thicker than standard conformal coatings and allows for dam-and-fill applications and glob topping.

What are the differences between application methods for HumiSeal® UV20GEL?

HumiSeal® UV20GEL is applied by dispensing, syringe, or hand-applied methods due to its gel-like consistency. These methods are preferred for precise, high-build applications or for coating around components. Unlike liquid coatings, it is not suitable for spraying or dipping.

What is the maximum operating temperature for HumiSeal® UV20GEL?

HumiSeal® UV20GEL is rated for continuous operation from –40°C to +125°C. Intermittent above +125°C is possible, but continuous use above the recommended temperature range may degrade coating integrity.

What safety precautions should I take when using HumiSeal® UV20GEL?

Use in well-ventilated areas. The product may contain acrylates and other irritants, so prevent skin and eye contact by wearing appropriate protective equipment. Consult the Safety Data Sheet (SDS) for detailed handling and disposal instructions.

How can I ensure proper application of HumiSeal® UV20GEL?

The gel fluoresces under UV light, allowing easy inspection of coverage and uniformity, which is critical for high-reliability electronics manufacturing, especially for ensuring full component coating. This feature is crucial for confirming the initial UV cure has been applied to all intended areas.

How does HumiSeal® UV20GEL perform in harsh environments?

HumiSeal® UV20GEL provides exceptional protection against moisture, chemicals, and mechanical stress. Its unique thixotropic consistency allows for a thick, non-flowing barrier, making it particularly effective in maintaining performance in humid and corrosive environments. It's well-suited for automotive, industrial, and aerospace applications that require rapid throughput and a durable barrier.

Learn More About HumiSeal® UV20GEL

HumiSeal® UV20GEL is a proven solution for engineers needing to protect specific, high-risk components on electronic assemblies. This acrylate gel offers a unique combination of a non-flowing gel consistency, fast UV cure, and excellent electrical insulation—making it an industry favorite for glob top, dam and fill, and spot coating applications on PCBs in sectors such as automotive, aerospace, and industrial automation.

Key Features at a Glance

✔ Thixotropic gel for targeted application
✔ Rapid UV cure in seconds
✔ Secondary moisture cure

Targeted Application Methods 🧰

HumiSeal® UV20GEL is specifically designed for applications requiring precise, high-build coverage. Its thixotropic nature prevents it from running or sagging, making it ideal for spot coating. It is not designed for spraying, brushing, or dipping. Instead, it is applied using automated or manual dispensing equipment. Unlike a liquid coating, no dilution is needed.

Application Methods:

Automated Dispensing: For high-volume, repeatable processes.
Syringe/Hand Application: For low-volume or rework.

The UV cure provides near-instantaneous processing time, while the secondary moisture cure ensures that shadowed areas are fully protected over a few days, eliminating the need for complex curing protocols.

Application Compatibility

Its gel consistency is compatible with various component types and PCB layouts, providing reliable protection for complex assemblies.

Compatible With:

✔ Dam-and-fill applications
✔ Spot coating for specific areas
✔ High-reliability applications requiring a thick, protective barrier

Additionally, its UV fluorescence ensures easy inspection, and the coating is reworkable using standard HumiSeal strippers—ideal for repairable designs and serviceable assemblies.

High-Performance Electrical Protection 🧪

UV20GEL protects even the most sensitive circuit designs from moisture, contaminants, and voltage-induced failure.

Fluorescent for Inspection 💡

To simplify quality assurance, HumiSeal® UV20GEL fluoresces under UV light, making it easy to confirm proper coating coverage during post-application inspection.

Repairable and Reworkable 🔁

Unlike many conformal coatings, HumiSeal® UV20GEL is easily repairable. Should rework or component replacement be required, the coating can be selectively removed using appropriate solvent, making it ideal for prototyping, low-volume builds, or field serviceability.

Reliable Across Environments 🌍

With a wide thermal operating range of –40°C to +125°C and excellent resistance to moisture, UV20GEL ensures consistent performance across varied environmental conditions. It’s particularly well-suited for mission-critical systems exposed to humidity, mechanical stress, or temperature cycling, where its thick, non-flowing barrier provides enhanced protection.