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cellular ceramics


CERAMIC FLAME ARRESTORS


CERAMIC FLAME ARRESTORS

CERAMIC FLAME ARRESTORS 1

INTRODUCTION

Zero-maintenance batteries have revolutionized the lead battery industry. One of the key components is a special ceramic filter disc. These are porous discs with perfectly tailored pore size and porosity, press fitted into the Cap.

KEY FUNCTIONS:

Flame arresting:  In an event of sparking outside a battery, they prevent the propagation/ ingress of flame from outside to inside by the use of a matrix of uniform openings that are carefully constructed   to quench the flame. This provides an extinguishing barrier to the ignited flame.

Zero top-up: Small & uniform pores along with the water repellent properties prevents depletion of electrolyte through the pores.

Venting: Tailored pore size and pore volume ensures controlled venting of gases, heat developed especially during charging, preventing the build-up of gases that can otherwise lead to explosion.

Comparison Of Polymer Vs Ceramic Micro-Porous Filter Discs




  • WHY ENDURA'S CERAMIC FLAME ARRESTORS?
      Polymer Ceramic
    Flame arresting Melting point of Polypropylene is very low. In an event of a fire, the disc can melt when in contact with the flame. Melting point of Endura's Ceramic Flame Arrestors is >20000C. In an event of a fire, the disc will work as an excellent barrier.
    Strength The strength of a polymer disc is limited. The crushing strength of Endura's ceramic disc is 150-200 kg/cm2. The disc can be easily inserted without breakage.
    Resistance to sulphuric acid Polypropylene is susceptible to a liquid oxidative degradation mechanism which leads to charring and brittle failure. The ceramic bond is formed by sintering at very high temperatures and not by alkali fusion. The absence of alkali makes the ceramic discs highly resistant even to highly corrosive strong acids even at elevated temperatures.
    Uniform pore size Since polymer discs are manufactured by fusion technique, extremely precise control in processing is required, otherwise the pore size and pore volume can vary significantly. In Endura's ceramic discs, the pore size is controlled by precise control of the granulometry grains used. Since the bond formation is by sintering and not fusion; the pore size and pore volume can be controlled precisely with minimal variation from batch to batch.
    Permeability Variation in pore size and pore volume can significantly affect the permeability. Uniform pore size and porosity leads to precise permeability with minimal deviation.
Key features:
  • Porosity (%) of 45 + 5
  • Uniform pore size of 150 – 200 microns
  • Precisely tailored permeability as per customer requirements
  • Very high strength with CCS values of 150 – 200 kg/cm2
  • Very good acid resistance
  • Excellent water repellency stable in acidic conditions
CFA Polymer Vs Ceramic


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