PRODUCT DATA SHEET
FG- · REV 1 · Jul 2026
Pipe Covers · Fiberglass
Fiberglass ASJ
BRAND: Johns ManvilleSKU FAMILY: FG-3 STOCKED SIZES
Pre-formed fiberglass pipe insulation with factory-applied all-service jacket (ASJ) and self-sealing lap for mechanical and process piping from 0°F to 850°F.
AT A GLANCE
Max service temp850°F
FormPre-formed pipe
Thickness range1-1/2" (stocked); 1/2"–3" available
FacingASJ (all-service jacket) with self-sealing lap
StandardASTM C547
Flame / smoke25 / 50 (ASTM E84 / UL 723)
TECHNICAL DATAPER MANUFACTURER
| Standard / specification | ASTM C547 Type I, Class 3 |
| Thermal conductivity (k) | 0.23 @ 75°F |
| Water-vapor sorption | ≤5% by wt (ASTM C1104) |
| Combustibility | Plain: non-combustible (ASTM E136); jacketed: limited-combustible, 25/50 |
APPLICATIONS
- Hot and chilled water
- Steam and condensate
- Domestic hot water and HVAC piping
- Process piping to 850°F
THERMAL CONDUCTIVITY — K VS. MEAN TEMPBTU·IN/HR·FT²·°F
| Mean °F | 75 | 200 | 300 | 400 | 500 |
|---|
| k value | 0.23 | 0.28 | 0.34 | 0.44 | 0.55 |
STOCKED SIZES & SKUS3 SIZES
| SKU | NOM. SIZE | WALL / 2ND | LENGTH |
|---|
| FG-650-150 | 6.5" | 1.5" | 3 ft |
| FG-1000-150 | 10" | 1.5" | 3 ft |
| FG-1400-150 | 14" | 1.5" | 3 ft |
FEATURES
- 0°F to 850°F service
- k = 0.23 @ 75°F
- 25/50 flame-smoke rated
- Self-sealing ASJ lap speeds installation
- ASTM C795-compliant over stainless
PACKAGING & HANDLING
| Packaging | Cartoned 3 ft sections with self-sealing lap |
| Handling & storage | Keep dry; store indoors; do not stand sections on end |
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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.