PRODUCT DATA SHEET
MW-FSK- · REV 1 · Jul 2026
Insulation Mat & Board · Mineral Wool
Mineral Wool Foil Scrim Kraft
BRAND: Johns ManvilleSKU FAMILY: MW-FSK-1 STOCKED SIZE
FSK-faced mineral wool insulation — foil-scrim-kraft facing provides an integral vapor retarder and finished appearance.
AT A GLANCE
Max service temp1200°F
FormRigid board / roll (FSK-faced)
Thickness range2" x 36" x 20'
FacingFSK (foil-scrim-kraft)
StandardASTM C612
Flame / smoke25 / 5 faced (ASTM E84 / UL 723)
TECHNICAL DATAPER MANUFACTURER
| Standard / specification | ASTM C612 Types IA–IVB |
| Thermal conductivity (k) | 0.23 @ 75°F (8-pcf board) |
| Density | 8 pcf (nominal) |
| Water-vapor sorption | <1% by wt (ASTM C1104) |
| Combustibility | Non-combustible per ASTM E136 |
APPLICATIONS
- Ducts and plenums
- Tanks and equipment needing a faced finish
- Dual-temperature equipment
THERMAL CONDUCTIVITY — K VS. MEAN TEMPBTU·IN/HR·FT²·°F
| Mean °F | 75 | 200 | 300 | 400 | 500 |
|---|
| k value | 0.23 | 0.3 | 0.36 | 0.42 | 0.49 |
STOCKED SIZES & SKUS1 SIZES
| SKU | NOM. SIZE | WALL / 2ND |
|---|
| MW-FSK-2-36 | 2" | 36" |
FEATURES
- Rated to 1200°F (core)
- FSK facing acts as vapor retarder
- 25/5 faced flame-smoke
- Water-repellent core
- Foil face tapes cleanly
PACKAGING & HANDLING
| Packaging | Faced roll/boards |
| Handling & storage | Keep dry; store flat indoors |
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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.