Nashua FoilMastic Butyl Rubber Sealant Tape [UL 181B-FX listed] (367-17)

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    View "Full Pricing Table" below for details including case sizes and volume pricing.
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  • Size
    Purchased Most Frequently: 2 in. x 100 ft. (Silver)
  • Price
    $ Price/photo will update once Color & Size chosen.
Before ordering, please read the "Product Description & Specs" tab content for more information about this item.

Product Description

Nashua 367-17 FoilMastic Butyl Rubber Sealant Tape is a UL 181B-FX listed 2 mil dead-soft aluminum foil tape coated with 15 mils of butyl rubber mastic adhesive. Used for indoor and outdoor sealing of low, medium, and high pressure HVAC systems including sheet metal and flexible duct systems. Also to seal cracks and seams in gutters, sheet metal roofing and trailers; plus for basic sheet metal repairs.

Features & Benefits

  • Aggressive butyl mastic adhesive
  • Provides instant water and air-tight seal
  • Resistant to moisture and solvents
  • Performs to SMACNA 0.5-inch, 1-inch, 2-inch, 3-inch, 4-inch, 6-inch up to 10-inch w.g. pressure classes and seal classes A, B, and C.
  • Conformable foil backing: easy to use in tight spaces; conforms easily to round, square or odd-shaped objects.
  • UL 181B-FX Listed: meets code requirements and can contribute toward requirements for EA Credit 1 (Optimize Energy Performance) under LEED®.
  • Low VOC Content: can contribute toward satisfying EQ Credit 4.1 (Low Emitting Materials) under LEED®.
  • Shows excellent resistance to mold growth, humidity, flame spread, smoke generation, and the effects of high temperatures.

Please note that Nashua 367-17 and Polyken 367-17 are the same product manufactured by Berry Plastics. Therefore the tape roll core may be branded with Nashua or Polyken, depending on current inventory. Country of Origin: United States.


Technical Information

Nashua FoilMastic Butyl Rubber Sealant Tape (367-17)
  • Standards Met: UL 181B-FX Listed; Pressure testing validated by SMACNA Testing & Research Institute
  • Carrier/Backing: 2 mil aluminum foil - printed
  • Adhesive: butyl rubber   How are adhesives different?
  • Release Liner: low-density polyethylene (LDPE) film
  • Thickness: 17 mils (carrier, adhesive) 15 mils (adhesive) 2 mils (carrier)   What is mil thickness?
  • Adhesion: 90 ounces per inch (to stainless steel test panel)
  • Adhesion to Backing: 40 ounces per inch
  • Tensile Strength: 23 pounds per inch (longitudinal)
  • Service/Operating Temperature: 40°F to 200°F
  • Core: 3" diameter
  • Flame Spread Index: < 25
  • Smoke Development Index: < 50
  • VOC Content: < 1 g/L
  • Country of Origin: United States
Note: Specifications are those given by manufacturers and are not tested for accuracy.

Download Datasheets

The following downloads are available for this product:

Download Safety Data SheetDownload Technical Data Sheet

367-17 Standard sizes


2 in. x 100 ft.

Actual Size: 48mm x 30.5m

367-17/ 2100

UPC = 742366010834

Single Item (1-23 Items)

1 - 4 Cases (24-119 Items)

5 - 9 Cases (120-239 Items)

10+ Cases (>= 240 Items)


a 1% discount

a 2% discount

a 4% discount





3 in. x 100 ft.

Actual Size: 72mm x 30.5m

367-17/ 3100

UPC = 742366010155

Single Item (1-15 Items)

1 - 4 Cases (16-79 Items)

5 - 9 Cases (80-159 Items)

10+ Cases (>= 160 Items)


a 0% discount

a 2% discount

a 4% discount





Question & Answers

[ viewing questions 1 through 2 of 2 total ]
Richard Aug 13, 2019
QUESTION: does this product have any siolcone based materials in it
ANSWER: Berry sent us a safety data sheet now for Nashua 367-17 which can be found at: you.
Ruben Mar 09, 2019
QUESTION: What is the difference between 360-17 and 367-17 ?
ANSWER: Nashua 367-17 is UL 181B-FX listed which is the HVAC standard for Class 1 Flex Duct. Another difference is that Nashua 360-17 has 200 ounces per inch of peel adhesion vs. 90 ounces per inch for 367-17. Thank you.

User Reviews

[ viewing reviews 1 through 1 of 1 total ]
Kevin B. Verified Buyer Oct 14, 2019
Flex duct sealing
Nashua 367-17 FoilMastic Butyl Rubber Sealant Tape [UL 181B-FX listed]
Used it to seal some loose flex duct we had in our basement.
Made in the USA
hot melt rubber (synthetic)
Offers the widest range of application flexibility available. Exhibits excellent processing performance whether manually or automatically applied. Has superior tensile strength, adhesion properties and holding force which ensures consistent, reliable seals. Hot melt adhesive will bond faster to a surface which is referred to as quick-grab or quick-stick. It typically has higher tack (will feel stickier to the touch), but is also softer. It has lower heat resistance, shear resistance, and sometimes UV resistance than an acrylic adhesive. NOTE: it is called hot melt because the adhesive is applied hot by the manufacturer and then hardens as it cools (you do not need to apply heat to the tape yourself).
natural rubber
Properties are similar to that of hot melt rubber, but natural rubber often holds where other adhesives won't (recycled fibers, dust, cold, heat and heavy loads). It provides good overall adhesion and moisture resistance.
Offer excellent performance, especially for applications in temperatures less than 40°F and greater then 120°F. It provides excellent clarity, has high shear strength, is usually more permanent/durable even when exposed to moisture, and it ages well over extended periods in fluorescent and sunlight. Since it remains clear for the life of the application and does not yellow over time it is ideal for applications such as sealing white cartons. While it has good initial adhesion it does take 24-48 hours to cure and to achieve its maximum bond strength (has gradual adhesion buildup). Another difference between hot melt rubber and acrylic adhesive is if you fold tape over making the two adhesive sides touch the acrylic adhesive will remain attached to the carrier (e.g. paper, film) while a hot melt adhesive will stick to itself and pull off of the carrier. It is the best choice for clarity, UV resistance and aging characteristics.
Is great for extreme temperature applications since silicone adhesive can work in continuous operating temperatures from -100°F to 500°F. They also exhibit good chemical resistance, retain electrical properties, and remove cleanly with little or no residue.
zinc oxide
Zinc oxide based adhesive formula is a skin-friendly adhesive which is commonly used on sports medicine tapes.
Thickness, AKA caliper or gauge, refers to the distance from one surface of a tape backing, or adhesive, to the other.
1 mil = 1/1000 of an inch
Examples: 1/16 inch = 62.5 mils; 1/32 inch = 31.25 mils
The cut level indicates how many grams of cutting load a glove can withstand from a sharp blade before being penetrated.
Lower gauge gloves are heavier - have thicker construction, fewer stiches knitted per inch and offer less dexterity.
Higher gauge gloves are lighter - have thinner/finer construction, more stitches knitted per inch and offer more dexterity.
Gloves offered typically runs from 7 to 18 (12 and 13 are in the middle of the scale).
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