UV Curing Solder Joint Protection Adhesive

3728 is a milky white, solvent-free UV curing adhesive specially formulated for solder joint protection and PCB conformal coating. It cures rapidly under UV or LED UV light at 1200 mJ/cm², delivers high flexibility to absorb thermal and mechanical stress, and provides excellent adhesion to a wide range of materials with outstanding moisture and aging resistance.

Key Features

• Fast curing speed: cures in seconds at 1200 mJ/cm² for efficient production.
• High flexibility: flexible cured film protects solder joints from thermal cycling and vibration stress.
• Excellent adhesion: strong bonding to solder joints, PCB laminates, copper, tin and electronic components.
• Good working performance: smooth dispensing and easy application for manual or automated processes.
• Moisture and aging resistance: dependable long-term protection against humidity, oxidation and aging.

Applications

• Solder joint protection and reinforcement on PCB assemblies.
• Conformal coating for circuit boards in consumer and industrial electronics.
• Coil end fixing, wire anchoring and component potting.
• Smartphones, wearables, automotive electronics and LED modules.
• General electronic assembly requiring fast UV cure and flexible protection.

Technical Datasheet

FAQ

Q1: What materials can 3728 bond to?
3728 offers excellent adhesion to solder joints, PCB laminates, copper, tin, gold, glass, ceramics and most engineering plastics used in electronic assemblies.

Q2: What light source and curing dose are required?
3728 cures with standard UV or LED UV lamps (365-405 nm). A cure dose of 1200 mJ/cm² is recommended, giving a cure time of only a few seconds depending on lamp power and distance.

Q3: Is the cured adhesive flexible despite the 60 Shore D hardness?
Yes. The 60 Shore D hardness balances rigidity with high flexibility, allowing the cured film to absorb thermal cycling and vibration stress without cracking, protecting solder joints over the long term.

Q4: Is 3728 easy to apply?
Yes. Its viscosity of 13000 ± 1500 mPa.s at 25°C provides clean, controllable dispensing with good sag resistance, suitable for both manual application and automated dispensing lines.

Q5: What are the storage conditions and shelf life?
Store in the original sealed container at 8-28°C, away from light and heat. Shelf life is 6 months from the date of manufacture.

Q6: What packaging options and samples are available?
3728 is available in 50g and 300g syringes, with OEM packaging supported. Free samples are provided for trial and validation before bulk orders.

Contact us for free samples, technical datasheets and OEM customization.