GCP 1805 | Halogen-free Insulating Epoxy Coating Powder

Harmonization Code : 3907.30.00.90 |   Polyacetals, other polyethers and epoxide resins, in primary forms; polycarbonates, alkyd resins, polyallyl esters and other polyesters, in primary forms : Epoxide resins : Other
Main features
  • Blue and Gold Colors
  • Halogen-free Epoxy Coating Powder
  • For class 2 & 3 capacitors and varistors

Product Description

LINQSOL™ GCP1805 is an insulating epoxy coating powder for capacitors, varistors and other passive components.  It was designed specifically as a halogen-free version of DK18-05 with similar technical specifications, just without containing any of the halogens.

LINQSOL GCP-1805 epoxy coating powders can be applied through a fluidized bed with temperatures as low as 105°C. Its excellent curing conditions make the epoxy coating powder also very suitable for tantalum capacitors and other temperature-sensitive devices.

LINQSOL™ GCP1805 epoxy coating powders are laser markable and are rated with a UL 94 V-0 flammability and RTI rating of 130°C.

Typical Applications:

  • Class 2 & 3 ceramic capacitors and varistors
  • Though-hole tantalum capacitors
  • Resistors like bendable thermistors, surge resistors
  • Inductors like toroid powder cores

Versions Available:

Product Family
15Kg box 1Kg box

Catalog Product

Unlike other products we offer, the products listed on this page cannot currently be ordered directly from the website.
Shipping in 12 weeks Shipping in 12 weeks In stock

Technical Specifications

General Properties
Chemistry Type Epoxy
The color
Density (g) 1.5 g/cm3
Process Method Fluidized bed
Specific Gravity
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.

For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
Particle Size
Particle Size thru 325 mesh 6-16 %
Particle Size thru 80 mesh 100 %
Shelf Life
Shelf Life
Shelf life is the amount of time after manufacturing that a product is guaranteed to retain its properties.

It differs vastly per product and it is based on temperature and storage conditions.

The properties can be guaranteed for the temperature and time range indicated on the TDS since those are the ones tested to be the best for the product.
Shelf Life @ 15°C 6 months
Chemical Properties
Water Absorption 0.3% %
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.
>20,000 V
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.
1.0x1015 Ohms⋅cm
Thermal Properties
Glass Plate Flow
Glass Plate Flow
Glass plate flow determines the flow distance of thermosetting epoxies, resins or coating powders on a smooth inclined glass surface in a certain time and temperature.

This value is the distance in millimetres from the upper point of the original position of the pellet to the point of extreme flow.

Typically measured at 150°C but please check the TDS for more info
25 - 35 mm
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.
108-112 °C
UL 94 Rating
UL 94 Rating
Flammability rating classification.
It determines how fast a material burns or extinguishes once it is ignited.

HB: slow burning on a horizontal specimen; burning rate less than 76 mm/min for thickness less than 3 mm or burning stops before 100 mm
V-2: burning stops within 30 seconds on a vertical specimen; drips of flaming particles are allowed.
V-1: burning stops within 30 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed.
V-0: burning stops within 10 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed.
5VB: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may develop a hole.
5VA: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may not develop a hole
Melting Temperature
Melting temperature 55 - 70 °C
Other Properties
Confirmation of tested functions, characteristics of a product.
UL 94 V-0
RoHS Compliant
RoHS Compliant
RoHS is a product level compliance based on a European Union Directive which restricts the Use of certain Hazardous Substances in Electrical and Electronic Equipment (RoHS).

Products compliant with this directive do not exceed the allowable amounts of the following restricted materials: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB) and polybrominated diphenyl ethers (PBDE), with some limited exemptions

Additional Information

  Low Melting Temperature & Long Flow


GCP 1805 has low melting temperature (<70 °C) and low curing temperature (<105°C). Its excellent flow properties (35mm) together with low pick up temperature enables coating components without pinholes problem. 

  Halogen-free & UL-listed


GCP 1805 is halogen-free powder, complying with RoHS and REACH requirements. GCP 1805 is also UL-listed with a V-0 flammablity and RTI rating of 130 °C. Thus, it is widely used in the industries for passive components coating.

  Wide Color Selection & Cost Effective


GCP 1805 powders are available in blue, brown, golden, orange and black, etc. It presents excellent fluidization in dipping equipment. Meanwhile, it provides the best price/performance ratio for your coating process. 


Specification GCP-1805
Shelf Life @ <25°C 3 months (from date of shipment)
Shelf Life @ <15°C 6 months (from date of shipment)
Volume Resistivity (Ohmscm) 1.0 x 1015
Breakdown Voltage (kV/mm) >20
Dielectric Constant @ 25°C 4.5-5.2 @ 50 Hz
Dissipation Factor @25°C <0.009 @ 1 Hz
UL Rating UL94 V-0 Level
Tg (°C) 108-112
Solvent Resistance No fading/loss of light in 120s acetone soak
Specific Gravity 0.6-0.85
Water Absorption (Boiling at 100°C for 4 H) <0.3%
Gel Time @ 120°C (sec) 80-110
Oblique Flow @Tilt angle 45°, oven 120°C (°C) 25-35
Melting Point (°C) 55-70
Horizontal Flow @ 120°C for 30 minutes (mm) 20-24


GCP 1805 Main Applications 

Linqsol GCP1805 is an UL 94 V-0 listed halogen-free product and pass UL RTI rating of 130 °C. With excellent dielectric properties and low moisture absorption, GCP1805 works best for your passive component applications, including capacitors, resistors, inductors, etc.


  GCP 1805 For Toroid Cores Insulation

Inductor powder cores are coated with epoxy powders to insulate and protect the core from copper wires. To maintain stability and avoid affecting magnectic properties or inductance values, epoxy coating powders must minimize core stress by having low shrinkage and low moisture absorption. 

Key Application Considerations

  • Magnetic property retention (inductance & loss) is critical
  • Parts are made in continuous manufacturing process
  • Reducing core stress maintains stability of inductance value
  • Parts are preheated, but not post-cured

Key Material Requirements

  • Low temperature curing and fast cure speed
  • Low shrinkage to reduce core stress
  • Low moisture absorption to reduce core stress


GCP 1805 Competitive Analysis

It could be seen from the table that the properties of GCP1805 are quite similar to DK18-05. The important features are the optimized pickup temperature and the low cure temperatures as low as 110°C. GCP1805 is expected to have a similar coating performance as DK18-05. It is suggested to coat GCP1805 powder for your passive components under the same preheating and curing conditions for DK18-05. Based on the trial results, the coating process could be further adjusted and optimized.

PROPERTY / PRODUCT DK 18-05 GCP 1805 Comment
Recommend Cure Conditions      
Preheat Temperature 100 ~ 180 °C 100 ~ 180 °C Same
Cure Conditions 30 mins @ 110 °C 30 mins @ 85~105 °C + 120 mins @ 105 °C Both could be cured under relatively low temperature
Pick Up Temperature Stick Point: 110 °C Melting Temperature: 55~70 °C Sticky point/melting tempearture indicate low and quick pick-up
Halogen-free NO YES GCP 1805 is halogen-free, better than DK 18-05
RoHS/REACH Compliant YES YES Same
Available Colors Similar
Typical Cured Properties      
Specific Gravity 1.64 g/cc 0.6 ~ 0.85 g/cc Lower
Glass Plate Flow 32 mm @ 150 °C 20 ~ 24 mm @ 120 °C Both have long plate flow
Hot Plate Gel Time 23 sec @ 160 °C 80 ~ 110 sec @ 120 °C Not comparable
Glass Transition Temperature Tg 107 °C 108 ~ 112 °C Similar
Moisture Absorption By Weight 0.37 % @ 24 hrs RT water < 0.3% @ 4 hrs boiling water Low moisture absorption
Flammability Rating UL94 V-0 V-0 Same
Relative Thermal Index (RTI) Rating UL 743B 105 °C 130 °C GCP 1805 has higher RTI rating Class B
Laser Markable YES YES Same
Volume Resistivity @ 25°C 8.4 x 1013 Ω · cm 1015 Ω · cm Similar
Dielectric Constant @ 25°C 4.5 @ 100 Hz 4.5 - 5.2 @ 100 Hz Similar
Dissipation Factor @ 25°C 0.009 @ 10 kHz 0.009 @ 10 kHz Similar
Breakdown Voltage TBD > 20 kV/mm Good insulation


GCP 1805 With Nanoproof Treatment for Passive Electronics Components