Duro-Last DFC50 Membrane - Manual (Page 2)

Duro-Last, Duro-Grip, “World’s Best Roof”, Duro-Fleece and Duro-Guard are registered marks owned by Duro-Last, Inc.
Created: 01/15/2014
2 of 2 www.duro-last.com 800-248-0280
DURO-FLEECE ® COLORS 50-MIL MEMBRANE
Codes and Standards:
Underwriters Laboratories (R10128).
Storage:
Store rolls lengthwise on pallets. Use tarps to keep rolls dry.
Membrane Attachment:
Adhered – DFC50 membrane may be adhered to a variety of properly prepared roof decks, walls, cover boards
and insulations including structural concrete, gypsum, lightweight concrete, DensDeck
® Prime Roof Board,
SECUROCK ® Gypsum-Fiber Roof Board, and Duro-Guard ® ISO products. It may be adhered directly to an
existing built-up roof (BUR) by using Duro-Fleece ® Adhesive or splatter applied Duro-Grip ® CR-20. Prior written
approval from the Duro-Last Engineering Services Department is required prior to adhering to BUR. Refer to the
Adhered Duro-Fleece Roofing System Specification for substrate preparation and acceptable adhesives.
Mechanically Fastened – DFC50 membrane may be mechanically attached to a variety of roof deck and wall
materials. An appropriate slip sheet or cover board may be required. Refer to the Duro-Last Mechanically
Fastened Systems Specification for system requirements.
Physical Properties:
DFC50 membrane has been subjected to the tests required by ASTM 4434 “Standard Specification for Poly (Vinyl
Chloride) Sheet Roofing” and has been classified as a Type III, internally reinforced sheet with a fabric backing.
The results of each test as well as typical values are listed below.
Physical Property Test Method ASTM 4434 Requirement Result Typical Value
Overall Thickness ASTM D751  0.045 in. PASS
50-Mil, nominal
(with fleece: 68-Mil)
Thickness Over Scrim ASTM D7635  0.016 in. PASS 28-Mil
Breaking Strength 1 ASTM D751 Grab Method  200 lbf./in. PASS 500 lbf x 344 lbf 1
Elongation 1 ASTM D751 Grab Method  15% PASS 32% x 77% 1
Seam Strength ASTM D 751 Grab Method
 258 lbf.
(75% of breaking strength)
PASS 278 lbf
Tear Strength 1 ASTM D751 Procedure B  45 lbf PASS 67 lbf x 160 lbf 1
Low Temp. Bend ASTM D2136 Must Pass at – 40 F PASS PASS
Heat Aging ASTM D3045
Conditioned for 56 days in oven
maintained at 176 F
PASS PASS
Accelerated Weathering
ASTM G154
(formerly G53)
5,000 hour total test time.
Irradiance level of 0.68 W/m2-nm.
Cycle: 8 hour at 145 F,
4 hour condensation at 122 F
PASS PASS
Dimensional Stability 1 ASTM D1204
Conditioned for 6 hours in oven
maintained at 176 F.
Allowable change: ≤ 0.5%
PASS 0.11% x 0.11% 1
Water Absorption ASTM D570
Immersed in water at 158 F
for 168 hours.
Allowable weight change: ≤ 3%
PASS 2.7%
Static Puncture ASTM D5602  33 lbf PASS  33 lbf
Dynamic Puncture ASTM 5635  14.7 ft-lbf (20 J) PASS  14.7 ft-lbf
1 Typical values are shown for both machine and cross machine directions. The machine direction results are listed first.