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Technical Data Sheet C-28
Full specification sheet for C-28 — chemistry, PSD, application guidance.
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Technical Documentation
C-Glass Flake Technical Data Sheet
Specifications for four standard C-glass flake grades — C-28, C-90, C-150, and C-400 — covering geometry, physical and optical properties, surface-area characteristics, chemical composition, and procurement parameters. Surface treatments: N (untreated) · V (vinyl-ester) · E (epoxy) · P (pigment).
1. Product Grades
GlassFlakes LLC produces four standard C-glass flake grades — C-28 (coarse / bulk fill), C-90 (mid-range / roller), C-150 (smooth / spray), and C-400 (ultra-fine / pigment). Grades differ primarily in median particle size (D50), aspect ratio, and bulk density. The five sub-tables below compare every grade across the parameter families that matter for coating formulation.
1.1Geometry / Morphology
Particle size is measured by sieve analysis per ASTM E11 / ISO 3310-1. D50 is the mass-median diameter; aspect ratio is the diameter/thickness ratio that governs barrier-path tortuosity in cured films.
| Grade | D50 (μm) | Aspect ratio | Thickness (μm) |
|---|---|---|---|
| C-28 Coarse / Bulk Fill | 600 | 120 | 5±2 |
| C-90 Mid-Range / Roller | 160 | 32 | 5±2 |
| C-150 Smooth / Spray | 100 | 20 | 5±2 |
| C-400 Ultra-Fine / Pigment | 15 | 3 | 5±2 |
Particle size distribution (% mass retained on sieve):
| Grade | Particle Size Distribution (μm) | |||
|---|---|---|---|---|
| 1700–300 | 300–150 | 150–45 | <45 | |
| C-28 | 80% | 20% | ||
| C-90 | 10% | 65% | 25% | |
| C-150 | 5% | 75% | 20% | |
| C-400 | 12% | 88% | ||
1.2Physical Properties
Bulk density determines bag yield and pack-out volume; oil absorption sets the resin-demand of each grade in coating formulations; water vapour permeability quantifies barrier performance in the cured film.
| Grade | Bulk density | Oil absorption | Water vapour perm. |
|---|---|---|---|
| C-28 Coarse / Bulk Fill | 0.2 | 141 | 0.001 |
| C-90 Mid-Range / Roller | 0.4 | 72 | 0.015 |
| C-150 Smooth / Spray | 0.5 | 55 | 0.021 |
| C-400 Ultra-Fine / Pigment | 0.75 | 35 | 0.037 |
1.3Surface & Interface
Surface treatments are silane-based coupling agents matched to the binder chemistry of the target coating. The single-letter codes appended to the grade (e.g. C-90E) indicate which silane is bonded to the flake surface.
- C-28: C-28V , C-28E , C-28N
- C-90: C-90V , C-90E , C-90N
- C-150: C-150N , C-150P
- C-400: C-400N , C-400P
- N — No surface treatment. Pigment, cosmetic, and inert filler applications.
- V — Vinyl-ester silane. Vinyl-ester resin systems for marine and chemical service linings.
- E — Epoxy-compatible silane. Epoxy primers, mid-coats, and tank linings.
- P — Pigment-grade (cosmetic). Cosmetic pigments and decorative finishes (C-150P / C-400P).
1.4Optical / Measurement
Refractive indices (liquid medium and particle) are reported for laser-diffraction PSD measurement (Mie theory). Obscuration level is the fraction of laser light blocked at the recommended dispersion concentration.
| Grade | Liquid RI | Particle RI | Obscuration (%) |
|---|---|---|---|
| C-28 Coarse / Bulk Fill | 1.333 | 1.6 | 9.13% |
| C-90 Mid-Range / Roller | 1.333 | 1.6 | 9.13% |
| C-150 Smooth / Spray | 1.333 | 1.6 | 6.79% |
| C-400 Ultra-Fine / Pigment | 1.333 | 1.6 | 6.46% |
1.5Surface Area System
Volumetric and mass-specific surface area determine coverage per kg, oil/resin demand, and the path-tortuosity factor in barrier coatings. Values are derived from PSD + platelet geometry; finer grades (C-400) deliver dramatically higher specific surface than coarse grades.
| Grade | Volumetric SSA (m²/cc) | Mass SSA (m²/kg) |
|---|---|---|
| C-28 Coarse / Bulk Fill | — | — |
| C-90 Mid-Range / Roller | 0.047 | 47.174 |
| C-150 Smooth / Spray | 0.076 | 76.236 |
| C-400 Ultra-Fine / Pigment | 0.327 | 327.233 |
◆Compare grades visually — interactive chart
Compare grades by
D50 (median particle size) (μm)
Source: GlassFlakes LLC product specifications · Use the selector to switch parameters.
2. Chemical Composition
All grades are produced from standard C-glass (chemical-resistant glass), giving superior alkali, acid, and salt resistance compared to E-glass. Pigment-grade variants C-150P and C-400P meet cosmetic-pigment heavy-metal limits and are suitable for personal-care and decorative applications.
2.1Oxide composition (C-glass standard)
- SiO₂: 65–72 %
- Na₂O: 9–13 %
- CaO: 4–11 %
- Al₂O₃: 1–7 %
- MgO: 0–5 %
- K₂O: 0–1 %
- Fe₂O₃: 0–0.4 %
2.2Heavy-metal content — pigment grades C-150P / C-400P
The C-150P and C-400P pigment-grade variants are produced under tightened raw-material control to meet cosmetic-pigment heavy-metal limits (FDA 21 CFR §73 / EU 1223/2009 Annex IV reference levels). Typical residual heavy-metal levels:
- As: 0.9 ppm
- Pb: 2 ppm
- Hg: 0.1–0.2 ppm
- Sb: 0.1–0.2 ppm
- Cd: 0.1–0.2 ppm
- Cr: 11.8 ppm
- Zn: 11 ppm
Physical reference values (all grades): melting point 930-1020°C · softening point ~688 °C · high resistance to acids, alkalis, and neutral salts.
3. Packaging & Procurement
Glass flake is supplied in moisture-proof paper bags of 20 or 25 kg net weight, palletised in pallet boxes wrapped in polythene for ocean and air freight. Procurement parameters below apply to all grades unless otherwise specified.
3.1Packaging units
Paper Bag
20 / 25 kg
Moisture-proof, heat-sealed
80 × 50 × 15 cm
Pallet Box
Bulk Shipment
Polythene-wrapped, banded
123 × 113 × 135 cm
Please refer to Product Gallery for details.
3.2Procurement parameters
- Minimum order quantity (MOQ): $1,000 kg (1 tonne)
- HS Code: 3207400000
- Lead Time: 7–14 days from order confirmation
- Trade terms: FOB Tianjin (default), CIF / CFR / DAP to worldwide ports
- Sample policy: Free of charge; customer covers freight (creditable on first order)
- Private Label: Custom bag printing available on request
4. Application — Success Stories
Field-validated case studies across marine, water-treatment, oil-and-gas, and infrastructure sectors. Click any card to expand the full case description.
5. Document Downloads
All documents are free of charge. Batch-specific Certificates of Analysis (COA) are issued with every shipment — contact us with your order reference for a copy.
PDF115 KB
Technical Data Sheet C-90
Full specification sheet for C-90 — chemistry, PSD, application guidance.
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PDF114 KB
Technical Data Sheet C-150
Full specification sheet for C-150 — chemistry, PSD, application guidance.
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PDF115 KB
Technical Data Sheet C-400
Full specification sheet for C-400 — chemistry, PSD, application guidance.
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PDF195 KB
Safety Data Sheet (SDS / GHS MSDS)
GHS-compliant safety data sheet for all grades — regulatory compliance.
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Need more information?
Our technical team can provide customised SEM data, application-specific recommendations, and batch COA documents.
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