Double-Sided Hot Air Solder Leveling (HASL) Red Oil Circuit Board
The double-sided HASL red oil circuit board is a type of printed circuit board with specific surface treatment
and identification features. Both sides of the substrate adopt the
hot air solder leveling process: molten tin alloy (lead-containing
or lead-free) covers the copper surface and is leveled by hot air
to form a uniform and flat tin layer. Meanwhile, the solder mask
uses red ink, which not only provides insulation protection but
also realizes the identification and differentiation of circuit
areas through its bright color. This circuit board is designed with
double-sided wiring, which can meet the signal transmission needs
of small and medium complexity circuits and is suitable for the
welding and assembly scenarios of conventional components.
Core Characteristics
• Combination of double-sided HASL and red oil solder mask: The tin layer provides a welding base with strong adhesion and a
bright surface; the red solder mask ink has a vivid color, stable
insulation performance, and both protective and identification
functions.
• Double-sided wiring structure: Supports two-way signal transmission, adapts to the circuit layout
needs of standard electronic equipment, and the wiring space meets
the design requirements of small and medium-sized circuits.
• Mature process adaptability: The combination of the HASL process and the red oil solder mask is
stable, and the ink has good compatibility with the substrate and
tin layer, which can adapt to conventional production processes.
Main Advantages
Reliable welding performance: The tin layer ensures good wetting of the solder, reduces the risk
of cold solder joints, and supports multiple welding operations,
facilitating mass assembly and later maintenance.
Clear identification and protection: The red solder mask can intuitively distinguish circuit areas,
making it easy for production inspection and fault diagnosis; at
the same time, it effectively isolates the copper surface from the
external environment, improving corrosion resistance.
Balance between cost and practicality: The HASL process is mature with high production efficiency, and
combined with the economy of red oil solder mask, the overall cost
is controllable. It is suitable for fields such as consumer
electronics, home appliances, and industrial control that are
cost-sensitive and require basic identification functions.
Good environmental adaptability: The combined effect of the tin layer and the red oil solder mask
enables the circuit board to maintain stable performance in normal
temperature, normal humidity, and general dust environments,
extending its service life.
