E-glass (“Electrical” grade glass) is by far the most used fiber in reinforced plastic composites. In many industries, it represents over 90% of the reinforcements used. Its main advantages are:

  • Low cost

  • High strength

  • Light weight (relative to steel)

  • High chemical resistance

The main disadvantages are:

  • Low modulus (relative to other reinforcing fibers)

  • Low fatigue resistance (relative to carbon fibers)

  • High weight (relative to other reinforcing fibers)

  • Highly abrasive when machined

  • Susceptibility to stress corrosion

Because of its widespread use, the advantages have a tendency to outweigh the disadvantages.  Almost all glass fibers are sold in strands of grouped fibers, or rovings, associated with a particular yield.  The yield is the number of yards of roving per pound. The metric unit of measure is TEX which is the weight in grams per kilometer (1,000 meters).  


Mike Brennan

5274 Cedarwood Blvd.

Mays Landing , NJ 08330

Tel: 609-476-6400 ext. 6417



George Aaron

5274 Cedarwood Blvd.

Mays Landing , NJ 08330

Tel: 609-476-6400 ext. 6402


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