C-Glass VEIL
Grade
VEIL = nonwoven surfacing veil / tissue
Pick for the resin-rich corrosion barrier layer on FRP tanks, ducts and pipe linings.
Values for the VEIL condition
What is C-Glass VEIL?
C-Glass VEIL is C-Glass in the VEIL grade — pick for the resin-rich corrosion barrier layer on FRP tanks, ducts and pipe linings. C-Glass VEIL has a tensile strength of 45 MPa (6.53 ksi), weaker than 56% of glass grades. Elongation at break is 4.8% and the elastic modulus is 69 GPa (10 Msi). C-Glass VEIL has a density of 2.52 g/cm³ (0.091 lb/in³), lighter than 68% of glass grades. It melts at 1,000°C (1,832 °F).
Advantages
- Ductile — tolerates forming and impact — 4.8%, better than 91% of glass grades
- Easy to machine — 35/100, better than 77% of glass grades
C-Glass VEIL properties
Typical room-temperature values for C-Glass VEIL; 6 are specific to this condition. Other listed values are C-Glass reference data and may not represent this condition. Bars are the position among glass grades.
Physical4
C-Glass VEIL has a density of 2.52 g/cm³ (0.091 lb/in³), lighter than 68% of glass grades. It melts at 1,000°C (1,832 °F).
Mechanical12
C-Glass VEIL has a tensile strength of 45 MPa (6.53 ksi), weaker than 56% of glass grades. Elongation at break is 4.8% and the elastic modulus is 69 GPa (10 Msi).
Thermal5
C-Glass VEIL is rated for continuous service to 350°C (662 °F). It conducts heat at 1.1 W/m·K (0.607 BTU/hr·ft·°F), worse than 73% of glass grades. Thermal expansion is 6.3 µm/m·K (3.5 µin/in·°F).
Electrical5
C-Glass VEIL is an electrical insulator with a dielectric strength of 12 kV/mm (304.8 V/mil) and a resistivity of 1×10¹⁰ Ω·m.
Chemical & Environmental2
Corrosion resistance is excellent (88/100), better than 69% of glass grades.
Sustainability4
Producing a kilogram of C-Glass VEIL takes about 45 MJ of energy and emits 2.4 kg of CO₂ — less than 58% of glass grades. Typical recycled content is 5%.
Manufacturability1
C-Glass VEIL's machinability is fair (35/100, better than 77% of glass grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C-Glass VEIL
Is C-Glass easy to machine?
Cured laminates containing C-glass are highly abrasive — use diamond or PCD-tipped tooling, high speed/low feed, and dust extraction.
Can C-Glass be welded?
Not weldable; glass fibre is joined only through the resin matrix (bonding, secondary lamination) or by mechanical fastening.
Can C-Glass be formed, bent or molded?
Supplied as veil, mat, chopped strand or roving; wet out easily with polyester, vinyl ester and epoxy in hand lay-up, filament winding and pultrusion.
What surface finishes work on C-Glass?
Veil gives the smooth resin-rich corrosion barrier surface directly; gel coat or a topcoat resin flood coat completes the finish — no plating or anodizing applies.
C-Glass chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| SiO2network former | 60 – 68 | 65 |
| Al2O3 | 2 – 6 | 4 |
| B2O3lowers melt viscosity, aids acid durability | 3 – 7 | 5 |
| CaO | 9 – 15 | 14 |
| MgO | 1 – 4 | 3 |
| Na2O + K2Ohigh alkali vs E-glass; lowers electrical resistivity | 8 – 11 | 8.5 |
| Fe2O3impurity | 0 – 0.5 | 0.2 |
| TiO2 + others | 0 – 0.5 | 0.3 |
C-Glass VEIL — frequently asked
What is C-Glass VEIL used for?
C-Glass VEIL is typically used for corrosion-resistant composite surfacing veils, battery separators and filtration media. In short: chemically durable glass fibre; standard corrosion-barrier veil; non-structural surfacing ply.
What is the tensile strength of C-Glass VEIL?
C-Glass VEIL has a typical tensile strength of 45 MPa (6.53 ksi) — weaker than 56% of glass grades.
Is C-Glass VEIL easy to machine?
Not especially — machinability is rated fair (35/100, better than 77% of glass grades). Cured laminates containing C-glass are highly abrasive — use diamond or PCD-tipped tooling, high speed/low feed, and dust extraction.
Can C-Glass VEIL be welded?
Not weldable; glass fibre is joined only through the resin matrix (bonding, secondary lamination) or by mechanical fastening.
What surface finishes work on C-Glass VEIL?
Veil gives the smooth resin-rich corrosion barrier surface directly; gel coat or a topcoat resin flood coat completes the finish — no plating or anodizing applies.
Can C-Glass VEIL be formed, bent or molded?
Supplied as veil, mat, chopped strand or roving; wet out easily with polyester, vinyl ester and epoxy in hand lay-up, filament winding and pultrusion.
What is the maximum service temperature of C-Glass VEIL?
C-Glass VEIL is rated for continuous use to about 350°C (662 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Engineered Materials Handbook Vol.1: Composites — Glass Fibers — ASM International (1987)
- ASM Handbook Vol.21: Composites — ASM International (2001)
- ASTM C581 — Chemical Resistance of Thermosetting Resins Used in Glass-Fiber-Reinforced Structures — ASTM International (2020)
- ASTM D578 — Standard Specification for Glass Fiber Strands — ASTM International (2018)
- C-glass surfacing veil technical data — Owens Corning / Johns Manville (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.