SI’s “A” glass is the original boron free glass. While other glass types are facing environmental issues, “A” glass does not produce any boron pollution. “A” glass is an excellent alternative to those polluting glasses as it has superior wicking of all resin types while it stabilizes and reinforces those resins to form a superior bond between the laminate and the core. And “A” glass has excellent corrosion resistance, protecting the core material from damage and prolonging the life of the part.
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The following is the glass composition of “A” glass by the industry:
| Glass Composition is: | ||
| Symbol | Wt % | Common Names |
| SiO2 | 72.50 silica | or silicon dioxide |
| Na2O | 17.00 soda | or sodium oxide |
| K2O | .35 potassia | or potassium oxide |
| CaO | 4.95 lime | or calcium oxide |
| MgO | 3.18 magnesia | or magnesium oxide |
| Al2O3 | 1.80 alumina | or aluminum oxide |
| Fe2O3 | .040 ferric oxide | or iron oxide |
| SO3 | .17 sulfate | or sulfur trioxide |
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