Shurtape SF-685

Shurtape SF-685
See also
Electrical Tapes
Tapes for Scrapbooking

Shurtape SF-685 ShurMASTIC Indoor/Outdoor Mastic On A Roll

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Before ordering, please click on the "Product Description & Specs" tab below for more information about this item.

SF-685 Special Order Sizes


2 in. x 100 ft.

Actual Size: 48mm x 30.5m

Approximately 10 extra business days to ship
SF-685/ 210024

Single Roll (1-23 Rolls)

1 - 4 Cases (24, 48, 72, ... Rolls)

5 - 9 Cases (120, 144, 168, ... Rolls)

10+ Cases (240, 264, 288, ... Rolls)

1 case minimum








3 in. x 100 ft.

Actual Size: 72mm x 30.5m

Approximately 10 extra business days to ship
SF-685/ 310016

Single Roll (1-15 Rolls)

1 - 4 Cases (16, 32, 48, ... Rolls)

5 - 9 Cases (80, 96, 112, ... Rolls)

10+ Cases (160, 176, 192, ... Rolls)

1 case minimum








Special Order Policies & Footnotes:

Special Order Policies

  • Special orders are non-returnable (and non-cancelable if materials have been already ordered or cut before the cancellation request was received).
  • Special order sizes often ship direct from our supplier so will not arrive together with stocked products.

Special Order Minimums

  • Minimum requirements apply because a size may be non-stock.
  • Minimum Quantities: If a particular size has a minimum item requirement, please only order that size in multiples of that minimum (e.g. if the minimum is 12, then use multiples like 12, 24, 36, etc).

Product Description

Shurtape SF-685 ShurMASTIC Indoor/Outdoor Mastic On a Roll is used for air-tight and moisture-free sealing of rigid and flexible air duct systems. Used primarily to seal sheet metal duct in both indoor and outdoor applications and used as a permanent, water resistant sealer. Use duct mastic to mend poorly sealed connections; improve indoor air quality (since fewer pollutants circulating); lower utility bills; and burn fewer fossil fuels.

Features & Benefits

  • Waterproof backing.
  • Stays supple and forms a permanent bond to substrate.
  • Aluminum foil backing may be painted with any paint recommended for aluminum.
  • Contains no asbestos, CFCs or PCBs.


Technical Information

Shurtape SF-685 ShurMASTIC Indoor/Outdoor Mastic On A Roll
  • Adhesive: non-flammable, butyl rubber   How are adhesives different?
  • Carrier/Backing: printed, aluminum foil
  • Release Liner: LDPE (low-density polyethylene) film
  • Thickness: 17 mils (carrier, adhesive)    What is mil thickness?
  • Adhesion: 255 ounces per inch (to stainless steel)
  • Tensile Strength: 25 pounds per inch (longitudinal)
  • Application Temperature: 35°F to 110°F
  • Service/Operating Temperature: -20°F to 200°F
  • Elongation: 560%
  • Flame Spread Index: 20
  • Smoke Development Index: 40
  • Certifications: UL 723 Classified; Pressure Classes SMACNA ½, 1,2,3,4, & 6; Seal Classes A, B,C; US Green Building Council – LEED Point contributor product; City of Los Angeles Approval RR #8069
  • Core: 3" diameter
Note: Specifications are those given by manufacturers and are not tested for accuracy.

AlertRoll Sizes/Widths:

Please note that tape rolls are NOT guaranteed to be splice- free. Tape rolls are typically cut to standard tape industry metric-cut sizes - or approx 5% narrower than the nominal size (i.e. 24mm per 1-inch of nominal width ordered).

Please contact us to inquire about pricing for full-cut widths (e.g. a 6 inch roll cut to exactly 152mm instead of 144mm).

Download Datasheets

Download Datasheets

The following downloads are available for this product:

Download Product Data Sheet
Shurtape SF-685 ShurMASTIC Indoor/Outdoor Mastic On A Roll
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
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