PA-GF (glass-fiber nylon): density and when to choose it
PA-GF is an umbrella name for nylons reinforced with chopped glass fiber (usually 15–30%). Compared to carbon fiber (PA-CF) it gives a similar boost in stiffness and reduction in shrinkage, but is noticeably less abrasive to the nozzle and usually cheaper. A specific example on a PA6 base is PA6-GF, already covered separately in the catalog; this page is a general look at the category for nylons on other bases (PA12-GF and blends).
Key properties
| Parameter | Value |
|---|---|
| Density | ≈1.30 g/cm³ (rises with glass fiber %) |
| Nozzle temperature | 250–275°C |
| Bed temperature | 80–100°C |
| Part cooling | minimal |
| Shrinkage | noticeably lower than unfilled nylon |
| Enclosure required | recommended |
When to use it
- Brackets and housings that need stiffness and dimensional stability, where carbon fiber's abrasiveness and price are overkill.
- Parts printed with an inexpensive brass nozzle — glass fiber wears down metal noticeably slower than carbon.
- Replacing aluminum or ABS parts where stiffness is needed without a sharp increase in print cost.
When to pick something else
- You need maximum stiffness and minimum weight — PA-CF beats it on specific stiffness if the nozzle is already hardened.
- You need specifics for a PA6 base — see the separate article on PA6-GF, where parameters for that grade are covered in detail.
- The material won't be mechanically loaded — the reinforcement premium won't pay off; plain PA6 or PA12 is simpler.
Pros and cons
Pros: a noticeable boost in stiffness and dimensional stability relative to unfilled nylon, less abrasive and cheaper than carbon-fiber alternatives, holds shape well on large parts.
Cons: the base remains hygroscopic nylon — drying before printing is mandatory; glass fiber still speeds up brass nozzle wear, though slower than carbon; lower specific stiffness than PA-CF at the same filler percentage.
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PA-GF is cheaper to run than carbon-fiber nylons — the brass nozzle lasts longer, and the filament itself usually costs less per kilogram. But the need for drying and a heated bed doesn't go away: budget the drying cycle before printing and the higher energy use the same way you would for any nylon, otherwise the real part cost ends up higher than the spool price suggests.