E Glass Technical Specifications
Properties of E-Glass

Melting point
 2084 °F  (1140 °C)
Softening Point
1562 °F  (850 °C)
Tensile Strength
 370     kg/m²
Young's Modulus
7700    kg/m² 
Density
2.54    g/cm³
Coefficient of Linear Thermal Expansion
5.0  1×10/°C 

Composition of E-Glass (%)

Composition of E-Glass (%)

Silicon Dioxide (SiO2)

 
50.2 ~ 55.4

Calcium Oxide (CaO)

 
24 ~ 29

Aluminum Oxide (Al2 O2)

 
11 ~ 13

Boric Oxide (B2 O2)

 
5.4 ~ 6.4

Magnesium Oxide (Mg2)

 
 0.4 ~ 0.9

Sodium Oxide (Na2O)

 
0.3

Iron Oxide (Fe2O2)

 
0.3

Potassium Oxide (K2O)

 
0.2

Thermal Conductivity Values

Listing below shows thermal conductivity values for E-Glass Fiber Pipe Insulation and other pipe insulations at the same temperature.

Thermal Conductivity @ 90°C
 
W/m/K 
Btu in/h/ft²/degF
E-Glass Fiber (ESLIN™)
0.042
0.292

Density Range

E-Glass Pipe Insulation is normally supplied at the optimum density for ease of handling. The normal density range of ESLIN™ E-Glass is from 180 to 220 kg/m³. E-Glass Fiber maintains its structural integrity even after years of service at high temperatures -- this is due to the mechanical binding in the needle mat manufacturing process. Other insulations become cracked or broken (chemical &/or physical reaction) when exposed to high temperatures.

Density (kg/m³)
E-Glass Fiber (ESLIN™)  
180 to 220

Acoustic Qualities

Although primarily designed for thermal insulation, ESLIN™ has a highly porous interconnected fibrous structure with good sound absorption qualities.

ESLIN™ as an Acoustic Insulation
Frequency (Hz)     
 
Absorption Coefficient
125
 
0.036
250
 
0.072
500
 
0.180
1000
 
0.480
2000
 
0.750
4000
 
0.860

Water Repellency

E-Glass Fiber Pipe Insulation is tested with continuous water drops over a several day period of time, without damage.  During this period, the insulation will slowly absorb some water (below 10% of weight).  If exposed, it can be dried out and still remain water repellant.

Insulation pH Value

Selection criteria for insulation should also include pH. pH levels above or below neutral values may promote corrosion under insulation.

Insulation pH Value   
E-Glass Fiber (ESLIN™)  
9.6

Chloride Leaching and Stress Corrosion Cracking (SCC)

Stress Corrosion Cracking (SCC) of austenitic stainless steel may be encountered when the steel is exposed with solutions containing halide ions, especially chloride ions. Chlorides are a potential source of halide ions. Some quantities of silicate are necessary to prevent the cracking phenomena; they tend to nullify the effect of chlorides. ESLIN™ E-Glass fiber has a very low leachable chloride content and an optimum amount of silicate material. These amounts fall well within acceptable ranges.

Chloride Leaching and Stress Corrosion Cracking (SCC)
 
  Cl (ppm)  
Na + SiO³ (ppm)
E-Glass Fiber (ESLIN™)
20
1580