April 15, 2017

New Product – Basalt Tadpole Seals

Basalt woven fiber is an environmentally friendly alternative to fiberglass materials. With excellent tensile strength, excellent resistance to Acid and Alkali, High abrasive resistance and a high melting point. Basalt originates from igneous rock (volcanic, molten lava) and is 100% Recyclable.


  • Basalt is a volcanic rock that has natural fire resistant components. The use of basalt in fibers is a potentially stronger, safer product than traditional glass fibers.


  • No secondary materials  (unlike glass fibers)
  • More abrasive than fiberglass so it is more difficult to manufacture, however, the abrasive qualities of Basalt make it a superior product.

Basalt vs. Glass Fibers

The main difference is that E-Glass is made from a complex batch of materials, whereas Basalt Fiber is made from melting basalt (volcanic) rock with no other additives need. This makes Basalt-based materials very environmentally friendly and non-hazardous.

Basalt Benefits compared to standard Fiberglass Include: 

  • 20-25% Higher Tensile Strength
  • 10-15% Higher Tensile Modulus
  • Higher Melting Point
  • Higher Operating Temperature
  • Extended Temperature range
  • Non-combustible, Fire-Resistant Material
  • Superior Abrasion Resistance
  • Greater Thermal Conductivity
  • Better Chemical Resistance, (4.5% better)
  • Low water absorption properties
  • Superior adhesion characteristics for coating
  • Resistance to electromagnetic radiation

Fire-blocking tests performed by Basaltex placed its basalt fabric in front of a Bunsen burner, placing the yellow tip of the flame in direct contact with the fabric. The yellow tip reaches temperatures of 1100°C to 1200°C (2012°F to 2192°F) and causes the fabric to become red hot, similar to a metal fabric. When exposed to the flame, basalt fiber maintains its physical integrity for extended periods of time, but the company found that a fabric made of E-glass with the same density can be pierced by the flame in a matter of seconds.

Tensile Strength (MPA) 2,500 to 3,000 1,400 to 2,600
Tensile Modulus 87 72
Elongation (%) 3.2% 4.70%
Density/Specific Gravity (g/cm2) 2.75 2.60
Dielectric constant (at 1mhz) 2.2 6.4
Thermal Conductivity (W/m-k) 1.44 – 1.46 1.28-1.32
Decomposition Temperature 1,562°F 1,346°F
Melting Point 2,642°F 2,076°F
Temperature Rating (continuous) 1,200°F 750°F
Temperature Rating (intermittent) 1,800°F 1,000°F