K-Flex Gray Duct Liner
Made in America
Designed for the sheet metal and insulation contractor
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Description
K-Flex Gray™ Duct Liner Insulation is an environmentally friendly, CFC and HCFC-free, closed-cell flexible elastomeric thermal and accoustical insulation. It is gray in color and supplied as rolls up to 60” wide in 1/2” and 1” thickness. It is supplied with S2S™ (Skin 2 Sides - plain) or with a specially formulated scrim-reinforced acrylic adhesive and tear-resistant release liner on the opposite side.
K-Flex Gray Duct Liner is non-porous, non-fibrous and resists mold growth. In addition to its closed cell structure, K-Flex Gray Duct Liner is protected with Bio-Guard™. The active ingredient in Bio-Guard is registered with the EPA. It is ideal for high humidity environments.
Features of PSA: tear and moisture resistant polyolefin easy release liner, continuous reinforcing scrim prevents stretching of insulation and improves peel strength.
Applications
K-Flex Gray Duct Liner is used to retard heat gain and prevent condensation or frost formation on cold equipment or ducts. It also effectively retards heat loss when used on hot equipment or ducts. K-Flex Duct Liner is recommended for applications ranging from -40°F to 200°F (-40°C to 93°C).
K-Flex Gray Duct Liner with PSA reduces installation time and minimizes the amount of solvent based contact adhesives required, thus making it ideal for new and retrofit applications. The scrim reinforcement reduces the tendency to stretch the sheet insulation during installation as well as improving the peel strength of the material.
K-Flex Gray Duct Liner can be used as both duct and air handling equipment liner.
K-Flex Gray Duct Liner thickness has been calculated to control condensation on cold surfaces.
Installation
K-Flex Gray Duct Liner Insulation should be applied to clean, dry ductwork and equipment. Compression joints with adhesive applied should be used on all butt edges. K-Flex Gray Duct Liner is acceptable for use in duct or plenum applications, meeting the requirements of NFPA 90A and 90B.
Resistance to Moisture Vapor Flow
The closed-cell structure and unique formulation of K-Flex Gray Duct Liner effectively retards the flow of moisture vapor, and is considered a low transmittance vapor retarder. For most applications, K-Flex Gray Duct Liner needs no additional protection.
Specification Compliance
ASTM C 534 Type 2 (Sheet), Grade 1
ASTM D 1056-00-2C1
ASTM C423/E795 NRC=0.50 at 1" thickness
ASTM C 1534-02 (Duct Liner Specification)
New York City MEA 186-86-M Vol. IV
USDA Requirements
Flamability:
UL 94-5V Flammability Classification (Recognition No. E300774)
ASTM E 84 Foam Core: 25/50 at 1” and below; PSA: 0/10
Meets requirements of NFPA 90A Sect. 2.3.3 for Supplementary Materials for Air Distribution Systems up to 1" thickness
Meets requirements of UL 181 sections 11.0 and 16.0 (Mold Growth/Air Erosion)
Meets requirements of ASTM C 411 (Test Method for Hot Surface Performance of High Temperature Thermal Insulation)
| Physical Properties | |||
|---|---|---|---|
| Temperature Range Sheets | -40°F to +200°F | ASTM C 411 | |
| Color | Gray | ||
| Thermal Conductivity | 75°F mean | 0.25 BTU-in/hr-ft²-°F | ASTM C 177 |
| Water Vapor Permeability | < 0.06 perm-in | ASTM E 96 | |
| Flexibility | Excellent | ||
| Water Absorption | <0.20 | ASTM C 209 | |
| Ozone Resistance | Good | ||
| Resistance to Oil & Greases | Good | ||
| Density | 3 pcf to 6 pcf | ASTM D 1622 ASTM D 3575 |
|
| Resistance to U.V. & Weather | Good¹ | ||
| Odor | Negligible | ||
| % Closed Cells | >90 | ||
| Mold Resistance | Pass | ASTM C 133 UL181/ASTM G 21 |
|
| Air Errosion | Pass 10,000 fpm | UL 181 | |
1. Where UV sterilizing equipment is used within the air handling system, protect K-Flex Gray Duct Liner with an EPA approved coating.