Shop - M788-1 Acrylic Conformal Coating for PCBs

Description

Product Overview：

M788-1 is a solvent-based conformal coating formulated with modified acrylic resin, alcohol and glycol ether solvents, and additives. It provides a transparent protective layer for electronic assemblies requiring moisture resistance, electrical insulation and protection against environmental contamination.

The single-component formulation requires no separate hardener. It becomes touch-dry within 30 minutes at room temperature and through-dry in 24 hours. Oven drying at 80°C reduces the through-drying time to 2–3 hours. Optimum room-temperature performance develops after seven days.

The cured film combines flexibility, adhesion and weather resistance with insulation resistance above 5 × 10¹² Ω and dielectric withstand voltage above 1,500 V. It also passes sulfurization-resistance and thermal-shock tests and achieves a Grade 0 mold-resistance result.

M788-1 contains a fluorescent tracer to help operators check coverage under UV light. Its low-odor formulation contains no aromatic solvents and meets RoHS, REACH and halogen-free requirements.

  · Single-Component Acrylic Formulation: Ready to use without mixing a separate resin and hardener.

  · Low Odor and No Aromatic Solvents: Uses an alcohol and glycol ether solvent system for applications where odor and solvent selection are important.

  · Clear, Glossy Film: Preserves the visibility of component markings and board details after coating.

  · Flexible Protective Layer: Combines flexibility, adhesion and weather resistance for electronic assembly protection.

  · Moisture and Dust Protection: Helps protect circuit boards and electronic components from moisture and airborne contamination.

  · Sulfurization Resistance: Passes sulfurization-resistance testing for applications requiring protection against sulfur-related corrosion.

  · Electrical Insulation: Provides insulation resistance above 5 × 10¹² Ω and dielectric withstand voltage above 1,500 V.

  · Fluorescent Inspection: Allows coating coverage to be checked under UV light, helping identify missed areas and uneven application.

  · Ambient or Oven Drying: Supports room-temperature drying or accelerated drying at 80°C.

  · Mold and Thermal-Shock Resistance: Achieves Grade 0 mold resistance and passes thermal-shock testing.

  · RoHS, REACH and Halogen-Free: Meets requirements for restricted substances and halogen-free material selection.

Typical Applications：

M788-1 conformal coating is intended for:

  · Printed Circuit Boards: Moisture protection, dust protection and electrical insulation for PCB assemblies.

  · Electronic Components: Clear protective coating for component surfaces, leads and soldered connections.

  · Industrial Control Electronics: Protection of control boards and electronic modules requiring coating flexibility, adhesion and weather resistance.

  · Power Supply and Appliance Electronics: Insulation and moisture protection for power supply boards and appliance control assemblies.

  · Assemblies Requiring Sulfurization Resistance: Protective coating for electronic assemblies exposed to environments where sulfur-related corrosion is a concern.

  · Assemblies Requiring Fluorescent Inspection: PCB protection with UV-visible tracing to help operators inspect coverage around components, leads and board edges.

Physical Properties：

Technical Notes:

  · Viscosity is expressed as cup flow time in seconds.

  · Dielectric withstand voltage in V is different from dielectric strength in kV/mm.

  · Insulation resistance in Ω is different from volume resistivity in Ω·m or Ω·cm.

  · Touch dryness does not indicate completion of curing or development of optimum properties.

Application Guidance：

  · Production Environment

Provide adequate ventilation and local exhaust during coating and drying. Keep the work area clean and keep the product away from flames, sparks and heat sources.

Use equipment suitable for handling flammable solvent-based coatings. Keep containers closed whenever possible to reduce solvent loss and contamination.

  · Surface Preparation

Ensure the coating surface is dry, clean and free from oil, dust and other contaminants. Special cleaning is generally unnecessary when the assembly already meets these conditions.

Mask connectors, electrical contacts, test points and other areas that must remain uncoated. Check compatibility with component materials, markings and solder masks before production.

  · Application and Thinning

Use X-08 thinner to adjust the working viscosity and coating thickness to suit the application process.

Apply an even film over the required areas, paying attention to component leads, board edges and areas where coating may accumulate. Establish the application settings on representative assemblies before production.

  · Drying and Curing

Optimum room-temperature performance develops after seven days.

Select the baking temperature according to component heat resistance and production requirements. Do not exceed 100°C.

Allow coated assemblies to cool after baking before handling or inspection. Touch dryness is an initial drying stage and should not be treated as complete curing.

  · Container and Equipment Management

Keep containers closed during use whenever possible. Do not direct fans or blowers at open containers, as this can accelerate solvent evaporation or cause surface whitening.

Before an extended shutdown, clean coating lines and nozzles. Transfer remaining working material into a separate, tightly sealed container. Do not return used coating to the original container.

Use the designated thinner to clean used containers, lines and nozzles.

  · Inspection and Rework

Inspect the coating under UV light to check coverage and identify missed areas. Also check for pooling, bubbles, uneven film formation and coating on masked areas.

Before reworking an assembly, select a method compatible with the coating, board and components. Inspect the repaired area and confirm the required insulation performance before returning the assembly to service.

Precautions：

  · M788-1 is flammable. Keep it away from flames, sparks and heat sources, and maintain effective ventilation during use.

  · Avoid inhaling solvent vapors and prevent contact with skin and eyes. Wear suitable protective gloves and eye protection, and follow the MSDS for handling requirements.

  · Use X-08 thinner for viscosity adjustment. Do not mix the coating with other products.

  · Keep stock containers tightly sealed and store used working material separately. Do not return used coating to the original container.

  · Do not exceed a baking temperature of 100°C. Allow heated assemblies to cool before touching them to avoid burns or damage to the film.

Packaging, Storage/Transport & Shelf Life：

  · Packaging

4 L/pail, 20 L/drum

  · Storage and Transportation：

Keep away from ignition sources and heat. Handle and transport in accordance with applicable regulations.

Protect the varnish from sunlight and ultraviolet light during storage and use. Store in a cool, well-ventilated area below 25°C.

  · Shelf Life：

Six months when stored in sealed containers at temperatures below 25°C.

Please Note：

  · As our products are continuously improved, the information in this manual may be updated from time to time without prior notice. Please feel free to contact our sales team for the latest version.

  · Do not mix this product with other products.

  · We strictly control product quality and supply products in accordance with applicable product standards. Custom products are supplied according to mutually agreed specifications. Application conditions vary and are beyond our control. You should therefore test and evaluate the product and the information provided in this manual, together with the recommended application procedures, to determine suitability for your specific use.