PRODUCT DATA SHEET
MW-DL- · REV 1 · Jul 2026
Pipe Covers · Mineral Wool
Mineral Wool DL
BRAND: Johns ManvilleSKU FAMILY: MW-DL-12 STOCKED SIZES
Water-repellent mineral wool pipe insulation furnished as nested double-layer sections for large pipe sizes; staggered joints reduce through-joint heat loss on hot lines to 1200°F.
AT A GLANCE
Max service temp1200°F
FormPre-formed pipe (double layer)
Thickness range2" wall, double-layer construction
FacingNone
StandardASTM C547
Flame / smoke5 / 0 (ASTM E84 / UL 723)
TECHNICAL DATAPER MANUFACTURER
| Standard / specification | ASTM C547 Types I, II, IV |
| Thermal conductivity (k) | 0.22 @ 75°F |
| Water-vapor sorption | <1% by wt (ASTM C1104) |
| Combustibility | Non-combustible per ISO 1182 |
APPLICATIONS
- High-temperature steam and process piping
- Power and refinery service
- Acoustic lagging of large lines
THERMAL CONDUCTIVITY — K VS. MEAN TEMPBTU·IN/HR·FT²·°F
| Mean °F | 75 | 200 | 300 | 400 | 500 |
|---|
| k value | 0.22 | 0.28 | 0.34 | 0.4 | 0.48 |
STOCKED SIZES & SKUS12 SIZES
| SKU | NOM. SIZE | WALL / 2ND | LENGTH |
|---|
| MW-DL-1200-200 | 12" | 2" | 3 ft |
| MW-DL-800-200 | 8" | 2" | 3 ft |
| MW-DL-2800-200 | 28" | 2" | 3 ft |
| MW-DL-1000-200 | 10" | 2" | 3 ft |
| MW-DL-2400-200 | 24" | 2" | 3 ft |
| MW-DL-2400-200-2 | 24" | 2" | 3 ft |
| MW-DL-2000-200 | 20" | 2" | 3 ft |
| MW-DL-600-200 | 6" | 2" | 3 ft |
| MW-DL-2200-200 | 22" | 2" | 3 ft |
| MW-DL-1800-200 | 18" | 2" | 3 ft |
| MW-DL-400-200 | 4" | 2" | 3 ft |
| MW-DL-800-200-2 | 8" | 2" | 3 ft |
FEATURES
- Rated to 1200°F
- Double-layer staggered joints cut heat loss
- Water-repellent (WR) binder
- Non-combustible
- Easily cut with a knife
PACKAGING & HANDLING
| Packaging | Cartoned 3 ft nested half-sections |
| Handling & storage | Keep dry; store indoors; water-repellent but protect from standing water |
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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.