High performance and eco-responsible E-glass

3B's E-glass is an eco-responsible solution combining outstanding performances with a high energy efficiency and environmentally friendly production. It is also corrosion resistant. 

High performance reinforcement for a wide range of applications

Meeting the specifications of E-CR glass standards (ASTM D578 & ISO 2078), 3B E-CR glass is an electrical & corrosion resistant glass that brings longer service life and durability to your composite parts through superior corrosion resistance to acid, water and alkaline environments.

Compared with traditional E-glass, 3B E-CR glass leads to higher performance and material costs savings.

3B offers reliable reinforcement solutions with its E-CR glass for a wide range of composite applications and markets.


Eco-responsible solution

Glass fibre reinforcements allow composite manufacturers to develop lightweight solutions that contribute significantly to reducing CO2 emissions.

At 3B, we have integrated pollution prevention at the heart of our manufacturing process to go one step further. 

By eliminating boron and added fluorides from the composition of its E-CR glass, 3B avoids detrimental manufacturing emissions. As we need a higher melting temperature for our boron-free E-CR glass, we have developed a process of integrated pollution prevention and control, using specific combustion techniques that include oxygen-gas firing and furnace design optimization. 

Choosing  3B E-CR glass means more value for the customer and less impact on the environment.

  • Removing boron from the glass composition stops the creation of dust particulates. These are associated with the partial volatilization when exposed to high temperatures.
  • The removal of added fluorides from the composition also reduces dust particulates.
  • The implementation of modern melting technology, means a drastic reduction in greenhouse gas emissions reductions such as NOx of around 80%.
  • Increased energy efficiency reduces CO2 emissions.

Performance properties

The life of a composite part is becoming increasingly challenging. This calls for the development of composite materials with exceptional and extremely durable properties.

Looking for higher temperature resistance, higher corrosion resistance, better static or long term fatigue properties? Look at 3B E-CR glass.

Typical 3B E-CR Glass properties

Property Test Method Unit 3B E-CR Glass E-Glass
Chemical Composition     No added Boron/Fluorides Added Boron/Fluorides
Softening point ASTM C338 °C 916 830-860
Refractive Index     1.56-1.57 1.54-1.56
Fibre weight loss in 10% H2S04 (100 hours @ 96°C)     5.5% > 40%
CLTE (0°C to 300°C) ASTM D696 10-6 °K-1 6 5.4

Typical 3B E-CR Glass fibre properties and advantages in thermosets & thermoplastics

Property in thermosets Test Method Unit 3B E-CR Glass E-Glass
Tensile Strength* ASTM D2343-08 MPa 2200-2600 2000-2500
Tensile Modulus* ASTM D2343-08 GPa 81-83 74-80

* Representative values of 17μm 2400 tex 3B E-CR Glass fibre, epoxy resin impregnated

Higher stiffness and strength make 3B E-CR glass the material of choice when optimum properties are needed along load bearings.


Property in thermoplastics Test Method Unit 3B E-CR Glass E-Glass
Tensile Strength* ISO 527-1-10 MPa 255-260 240-245
Tensile Modulus* ISO 527-1-10 GPa 16.8-17.1 15.5-16

* Representative values of PA compound heat stabilized reinforced with 50% GF chopped strand (10μm; 4mm).
Test made with chopped strand coated with the same sizing formulation.

Stiffness advantages of typical 3B E-CR glass has been validated in a wide range of thermoplastic resins (PP, PBT, Styrenics, High T polymers, etc.).

Acid corrosion resistance

The graph illustrates the stress corrosion resistance of a pultruded rod made with an iso polyester resin and a glass roving content of 75%. The static load was around 1100 MPa. It can be seen that, in a 1N chloridric acid environment at room temperature (23°C), to reach a 50-year service, the stress level should not exceed 12.7% of the static strength. At such stress levels the E-glass rod would only survive 3.7 days.

Stress rupture of pultruded rod in 1N Chlorifric Acid


Fatigue performance

The upper graph illustrates fatigue performance obtained on laminates made with epoxy resin and unidirectional fabrics. It can be seen that typical 3B E-CR Glass fibre improves fatigue performance by half a decade.

Tensile fatigue of Epoxy UD laminates