PRODUCT DATA SHEET
FGL-BLK- · REV 1 · Jul 2026
Insulation Mat & Board · Foamglas
Foamglas Flat Block 3.5
BRAND: Owens Corning (FOAMGLAS ONE)SKU FAMILY: FGL-BLK-1 STOCKED SIZE
FOAMGLAS cellular glass flat block, 3.5" thick with asphalt coating, for tank bases, equipment flats and cold-service surfaces.
AT A GLANCE
Max service temp−450°F to 900°F
FormRigid block
Thickness range3-1/2", asphalt-coated
FacingNone
StandardASTM C552
TECHNICAL DATAPER MANUFACTURER
| Standard / specification | ASTM C552 Type II (pipe) / Type I (block), Grade 6 |
| Thermal conductivity (k) | 0.29 @ 75°F |
| Density | 7.5 pcf (nominal) |
| Water-vapor sorption | 0.00 perm·in (ASTM E96); water absorption ≤0.2% by vol |
| Compressive resistance | 90 psi (capped, ASTM C165/C240) |
| Combustibility | Non-combustible — 100% glass, no binders (ASTM E136) |
APPLICATIONS
- Tank base and pad insulation
- Cold equipment flats
- Underground service
- CUI-critical systems
THERMAL CONDUCTIVITY — K VS. MEAN TEMPBTU·IN/HR·FT²·°F
| Mean °F | 75 | 200 | 300 | 400 |
|---|
| k value | 0.29 | 0.38 | 0.45 | 0.54 |
STOCKED SIZES & SKUS1 SIZES
| SKU | SIZE |
|---|
| FGL-BLK-350-AC | Foamglas Flat Block 3.5 Asphalt Coated |
FEATURES
- −450°F to 900°F service
- Zero vapor permeability
- High compressive strength — supports loads
- Non-combustible
- Asphalt coating adds moisture protection
PACKAGING & HANDLING
| Packaging | Cartoned blocks |
| Handling & storage | Rigid but friable at edges — handle with care; keep packaged until installed |
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Data shown is nominal and per the manufacturer's published literature; verify against the current submittal and SDS before specifying. Sun City Energy Supplies stocks to spec, fabricates to size, and returns quotes the same business day. Informational only — not a warranty of fitness for a particular purpose.