Glass fiber separators are a key component used inside batteries and are mainly made of ultra-fine glass fibers. This material has excellent chemical stability and insulating properties and is widely used especially in lead-acid batteries.


  1. Ultra-fine structure: Ultra-fine glass fiber spacer is made of interwoven glass fibers with very small diameter, forming a porous, fluffy and evenly distributed three-dimensional network structure.
  2. High porosity: Its high porosity is conducive to the full absorption and distribution of the electrolyte and promotes the ionic conduction inside the battery.
  3. Chemical stability: As the glass fiber itself is resistant to acid and alkali corrosion, it can remain stable for a long time in the acidic or alkaline environment inside the battery and does not react with the active substances inside the battery.
  4. Insulation: Good insulation ensures effective isolation between positive and negative electrodes, preventing short circuits.
  5. Mechanical Strength: Despite its relatively soft texture, it has sufficient mechanical strength to maintain the shape and dimensional stability of the battery during assembly, while allowing a certain degree of compression to adapt to different specifications of the battery design.
  6. Low Resistance: High quality glass fiber spacers have a low electrical resistance, which helps to reduce the internal resistance of the battery and improve the charging and discharging efficiency.


  • Mainly used in lead-acid batteries (such as car starter batteries, stationary valve-regulated sealed lead-acid batteries, etc.), as a separator between positive and negative electrodes, which both conducts electricity and prevents electrons from passing through it directly, allowing only ions to move freely during charging and discharging.
  • In some advanced battery technologies, such as fuel cells or other types of energy storage battery systems, similar diaphragm materials may also be used to optimize battery performance and life.