{"id":5568,"date":"2026-05-08T05:39:30","date_gmt":"2026-05-08T05:39:30","guid":{"rendered":"https:\/\/nylonplastic.com\/long-glass-fiber-vs-short-glass-fiber-nylon\/"},"modified":"2026-06-17T09:09:43","modified_gmt":"2026-06-17T09:09:43","slug":"long-glass-fiber-vs-short-glass-fiber-nylon","status":"publish","type":"post","link":"https:\/\/nylonplastic.com\/fr\/long-glass-fiber-vs-short-glass-fiber-nylon\/","title":{"rendered":"Nylon renforc\u00e9 de fibres de verre longues ou courtes : Guide complet des performances"},"content":{"rendered":"
\n \"long-glass-fiber-vs-short-glass-fiber-nylon\"
long glass fiber vs short glass fiber nylon<\/figcaption><\/figure>\n

The Fiber Length Difference<\/h2>\n

Glass fiber reinforcement is the single most effective way to boost nylon’s strength, stiffness, and heat resistance. But not all glass fiber nylon is created equal. The critical variable is fiber length\u2014and the difference between short glass fiber (SGF) and long glass fiber (LGF) reinforced nylon translates directly into real-world performance gaps that can determine whether a part succeeds or fails.<\/p>\n

Short glass fiber nylon<\/strong> starts with chopped strands 3\u20134 mm long, but after compounding and injection molding\u2014where the fibers are subjected to intense shear in the screw, barrel, and gate\u2014the final fiber length in the molded part averages just 200\u2013400 microns (0.2\u20130.4 mm).<\/p>\n

Long glass fiber nylon<\/strong> is produced using a pultrusion process that encapsulates continuous fiber bundles in the nylon matrix, creating pellets typically 10\u201312 mm long with fibers running the full pellet length. After molding, the retained fiber length is 1\u20133 mm\u2014roughly 5\u201310 times longer than SGF. This length retention is the source of all performance advantages.<\/p>\n

Property Comparison: SGF vs LGF<\/h2>\n\n\n\n\n\n\n\n\n\n\n
Propri\u00e9t\u00e9<\/th>\nPA6-SGF30<\/th>\nPA6-LGF30<\/th>\nDifference<\/th>\n<\/tr>\n<\/thead>\n
R\u00e9sistance \u00e0 la traction (MPa)<\/td>\n160\u2013180<\/td>\n190\u2013210<\/td>\n+10\u201315%<\/td>\n<\/tr>\n
Tensile Modulus (GPa)<\/td>\n9\u201310<\/td>\n10\u201312<\/td>\n+10\u201320%<\/td>\n<\/tr>\n
Izod entaill\u00e9 (kJ\/m\u00b2)<\/td>\n10\u201315<\/td>\n20\u201335<\/td>\n+100\u2013130%<\/strong><\/td>\n<\/tr>\n
Unnotched Izod (kJ\/m\u00b2)<\/td>\n55\u201370<\/td>\n80\u2013100<\/td>\n+40\u201350%<\/td>\n<\/tr>\n
HDT @ 1.82 MPa (\u00b0C)<\/td>\n195\u2013205<\/td>\n210\u2013215<\/td>\n+5\u201310\u00b0C<\/td>\n<\/tr>\n
Creep Resistance<\/td>\nBon<\/td>\nExcellent<\/td>\n2\u20133\u00d7 improvement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The most dramatic difference is in r\u00e9sistance aux chocs<\/strong>: LGF nylon can absorb more than double the impact energy of SGF nylon. This is because long fibers bridge across crack fronts, requiring significantly more energy to propagate a fracture. Under sustained load, LGF also shows 2\u20133\u00d7 better creep resistance<\/strong>\u2014the long fiber network resists the time-dependent deformation that affects SGF parts under constant stress.<\/p>\n

\"Illustration<\/figure>\n

Processing: What You Need to Know<\/h2>\n

Processing LGF nylon requires specific attention to preserve fiber length:<\/p>\n