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All you want know about the Glass-Filled Nylon

You’ve prob­a­bly heard of nylon: the syn­thet­ic mate­r­i­al was devel­oped in the 1930s by DuPont and quick­ly rev­o­lu­tion­ized the world of tex­tiles and mate­ri­als. It even played a role in secur­ing a win for the Allies in the Sec­ond World War. Since then, the mate­r­i­al has only grown in terms of its adop­tion and appli­ca­tions. It has also been improved upon. Com­pos­ite nylon blends, such as glass-filled nylons are cre­at­ing new oppor­tu­ni­ties for nylon-based plas­tics, par­tic­u­lar­ly for engi­neer­ing appli­ca­tions.

What are the Advantages of Glass-Filled Nylon?

Glass-filled nylon offers sev­en main advan­tages over oth­er mate­ri­als, includ­ing unfilled nylon. 

Enhanced Strength and Stiff­ness: Com­pared to tra­di­tion­al nylon, glass-filled nylons have a sig­nif­i­cant­ly high­er ten­sile strength (as much as 70% high­er). Some Nylon GF blends have up to 80% greater stiff­ness.

Improved Dimen­sion­al Sta­bil­i­ty: The addi­tion of glass fibers reduces nylon’s coef­fi­cient of ther­mal expan­sion for greater dimen­sion­al sta­bil­i­ty. In oth­er words, glass-filled nylon is less prone to warp­ing, shrink­ing, or expan­sion with tem­per­a­ture vari­a­tions.

Increased Heat Resis­tance: Adding glass fibers to nylon increas­es the material’s heat dis­tor­tion tem­per­a­ture (HDT). This enables glass-filled nylon to with­stand high­er oper­at­ing tem­per­a­tures with­out sig­nif­i­cant defor­ma­tion or loss of mechan­i­cal prop­er­ties.

Enhanced Impact Resis­tance: Glass-filled nylon can with­stand greater impact and has improved resis­tance to crack­ing and frac­tur­ing. This makes it suit­able for appli­ca­tions with dynam­ic load­ing.

Good Chem­i­cal Resis­tance: Nylon has good chem­i­cal resis­tance but glass-filled ver­sions of this mate­r­i­al can also with­stand expo­sure to var­i­ous chem­i­cals, oils, and sol­vents.

Excel­lent Mold­abil­i­ty: Glass-filled nylon can be mold­ed into com­plex shapes and intri­cate designs. It can be injec­tion-mold­ed with ease and sup­ports cost-effec­tive parts pro­duc­tion.

Elec­tri­cal Insu­la­tion Prop­er­ties: Like unfilled nylon, glass-filled nylon is elec­tri­cal­ly insu­lat­ing. This makes it an option for prod­ucts with elec­tri­cal or elec­tron­ic com­po­nents. 

What are the Disadvantages of Glass-Filled Nylon?

Although glass-filled nylon offers numer­ous advan­tages, there are also dis­ad­van­tages to con­sid­er.

Increased Abra­sive­ness: Glass-filled nylon is more abra­sive than unfilled nylon, so there’s increased wear on 3D print­er noz­zles, injec­tion molds, and CNC machine tools.

High­er Cost: Glass-filled nylon tends to cost more than unfilled nylon. Because its added strength and per­for­mance come at a high­er price, glass-filled nylon may not be cost-effec­tive for some appli­ca­tions.

More Brit­tle: Glass-rein­forced nylon tends to be more brit­tle than unfilled nylon. There­fore, it’s more prone to crack­ing or frac­tur­ing under sud­den impact or high-stress con­di­tions.

Added Weight: Glass-filled nylon can weigh up to 15% more than unfilled nylon — a draw­back for appli­ca­tions where light­weight parts are a pri­or­i­ty.

Anisotrop­ic Prop­er­ties: Glass-filled nylon exhibits anisotrop­ic behav­ior, mean­ing that its mechan­i­cal prop­er­ties can vary depend­ing on the direc­tion of load­ing. The align­ment of the glass fibers dur­ing man­u­fac­tur­ing can cre­ate vari­a­tions in strength and stiff­ness along dif­fer­ent axes of the part.

Mois­ture Absorp­tion: Unlike Nylon 12, glass-filled nylon tends to absorb mois­ture, which can lead to dimen­sion­al or struc­tur­al weak­ness­es in parts exposed to wet or humid envi­ron­ments. 

How is Glass-Filled Nylon Used in Parts Production?

3D print­ing, injec­tion mold­ing, and CNC machin­ing can all pro­duce parts made of glass-filled nylon mate­ri­als.

Injec­tion mold­ing: Plas­tic injec­tion mold­ing is a wide­ly used method for mass pro­duc­ing plas­tic prod­ucts. The process con­sists of inject­ing a melt­ed ther­mo­plas­tic, such as nylon, into a mold cav­i­ty under pres­sure and then rapid­ly cool­ing the plas­tic. The hard­ened part can then be removed and under­go post-pro­cess­ing if need­ed. There are many grades of rein­forced nylon avail­able for injec­tion mold­ing, the most com­mon of which is glass-filled nylon 66, with a fiber rein­force­ment ratio of between 10 and 50%.

CNC Machin­ing：Glass-filled nylon can also be machined, but the material’s abra­sive­ness pos­es chal­lenges. As with injec­tion molds and 3D print­er noz­zles, CNC machine tools wear more quick­ly when machin­ing glass-filled nylon. For best results, car­bide or ceram­ic tools are rec­om­mend­ed for machin­ing glass-filled poly­mers, and reduc­ing the cut­ting speed can also reduce tool wear. 

3D Print­ing: There are three forms of 3D print­ing that use glass-filled nylon mate­ri­als:

SLS (Selec­tive Laser Sin­ter­ing)

MJF (Mul­ti Jet Fusion)

FDM (Fused Depo­si­tion Mod­el­ing)

Because of glass-filled nylon’s abra­sive­ness, hard­ened steel noz­zles are rec­om­mend­ed for 3D print­ing with the mate­r­i­al. With SLS, the most com­mon­ly used nylon grade is PA 12, which can be rein­forced with up to 40% glass fibers, but anoth­er option is nylon 3200 glass-filled mate­r­i­al. For FDM 3D print­ing, glass-filled nylon fil­a­ments such as nylon 6 (PA 6) with 30% filler are used.

In pro­to­soon, we pro­vide glass-filled mate­r­i­al with tech­nolo­gies 3D print­ing, CNC and injec­tion mold­ing. Our tech­ni­cian will choose the best tech­nol­o­gy for your project.

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