Type 66-728 Knotted DuPont® Nylon, Dyed Black and Bonded, UV Stabilized, Used in DuPont® Nylon Impact Net
Available Twine Thicknesses: #12, #15, #18, #21, #36, #72
Available Mesh Sizes (sq. measurement): 3/4”, 1”, 1-3/4”
Twine Breaking Strength:
Note: The breaking strength per twine measures the amount of weight needed to break the DuPont® nylon twine completely. The mesh-burst strength indicates the amount of weight necessary to break through all 4 twines per mesh in our DuPont® nylon impact net.*
#12: 116 lb./twine, 464 lb./mesh
#15: 144 lb./twine, 576 lb./mesh
#18: 191 lb./twine, 764 lb./mesh
#21: 241 lb./twine, 964 lb./mesh
#36: 381 lb./twine, 1524 lb./mesh
#72: 740 lb./twine, 2960 lb./mesh
*see “Twine Size Comparison Chart” to see how 66-728 compares to other netting materials.
Chemical Composition:
Type 6 DuPont® nylon and type 66-728 DuPont® nylon do not have identical chemical compositions. They are made from different ingredients (type 6: caprolactam; type 66-728: hexamethylene diamine and adipic acid). They also differ structurally; that is, in the way the polymer chains are able to align and bond together. Type 66-728 has twice the number of sites available for hydrogen bonding between polymer chains.
Benefit: type 66-728 has a tighter molecular structure with more hydrogen bonding providing better resistance to wear, while enhancing our DuPont® nylon impact net resilience.
Density/Hardness:
The measured densities (weight per volume) of type 66-728 and type 6 are the same, but type 66-728 is more crystalline.
Benefit: the more crystalline structure of type 66-728 helps the fibers retain shape better and provide enhanced resilience.
Melting Point:
Type 66-728 melts at 260°C, and type 6 melts at 220°C.
Benefit: nylon is resistant to damage and heat due to friction. Type 66-728 has the highest melting point due to it’s molecular structure.
Colorfastness:
A key component of dye lightfastness is the type of dye chosen. The dye diffusion rate fro type 66-728 is not as fast as for type 6. Even though it is more difficult to dye type 66-728, this is advantageous because it is also more difficult to remove dye. Consequently, type 66-728 is inherently more lightfast than type 6. type 66-728 is also more resilient to the diffusion of other molecules through the fiber, like ozone and nitrous oxide, which can harm the fiber or dye.
Benefit: type 66-728 will be more resistant to fading due to sunlight or atmospheric contaminants.
UV Exposure:
Raw (not dyed, not bonded, not stabilized) type 66-728 nylon tops the chart for strength retention after 9 months exposure in Florida. Simply put, when raw natural colored fibers were tested for 9 months of exposure in Florida sunlight, the DuPont® type 66-728 nylon retained the highest percentage of strength when compared to type 6 nylon, polyester, and polypropylene. The resistance to UV exposure and weathering increases substantially as UV stabilizers, dye-stuffs, and bonding agents are added in the manufacturing process. Starting with the right raw material is key in getting long life and durability.
