PRODUCT DATA SHEET
CS-BLK-F- · REV 1 · Jul 2026
Insulation Mat & Board · Calcium Silicate
Calcium Silicate Block 1.5x12x36 Flat
BRAND: Johns ManvilleSKU FAMILY: CS-BLK-F-1 STOCKED SIZE
Thermo-12 Gold calcium silicate flat block for flat surfaces, boiler walls, and equipment to 1200°F.
AT A GLANCE
Max service temp1200°F
FormRigid block (flat)
Thickness range1-1/2" x 12" x 36"
FacingNone
StandardASTM C533
Flame / smoke0 / 0 (ASTM E84 / UL 723)
TECHNICAL DATAPER MANUFACTURER
| Standard / specification | ASTM C533 Type I |
| Thermal conductivity (k) | 0.41 @ 200°F |
| Density | 14 pcf (min dry avg) |
| Compressive resistance | >100 psi @ 5% (ASTM C165) |
| Combustibility | Non-combustible per ASTM E136 |
APPLICATIONS
- Boiler walls and breeching
- Tank and equipment flats
- Furnace exteriors
- High-temperature supports
THERMAL CONDUCTIVITY — K VS. MEAN TEMPBTU·IN/HR·FT²·°F
| Mean °F | 200 | 300 | 400 | 500 |
|---|
| k value | 0.41 | 0.45 | 0.49 | 0.55 |
STOCKED SIZES & SKUS1 SIZES
| SKU | SIZE |
|---|
| CS-BLK-F-150-12 | Calcium Silicate Block 1.5x12x36 Flat |
FEATURES
- Rated to 1200°F
- >100 psi compressive strength
- Non-combustible
- XOX corrosion inhibitor
- Asbestos-free
PACKAGING & HANDLING
| Packaging | Cartoned flat block, 12" x 36" |
| Handling & storage | Keep dry; store indoors off the ground; handle sections by supporting full length |
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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.