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PA Nylon Sheet vs. MC Nylon (Cast PA6G) Sheet: What’s the Real Difference?
2026-02-02
Key takeaways (for buyers)
PA nylon sheet usually means extruded PA6 or PA66 (melt-processed sheet).
MC nylon / PA6G sheet usually means monomer cast nylon (polymerized in a mold).
The best choice depends on thickness, machining goals, wear load, and supplier quality control—not only price per kg.
1) What each material name usually means
PA Nylon Sheet (Extruded PA6 / PA66)
This is nylon sheet produced by melting polymer pellets and extruding them into sheet form. In practice, “PA nylon sheet” most often refers to PA6 or PA66, sometimes with modifiers (glass fiber, solid lubricants, etc.).
Typical strengths: consistent supply, standard sizes, predictable machining in common thickness.
MC Nylon Sheet (Cast Nylon / PA6G / Monomer Cast)
“MC nylon” (often called PA6G in many markets) is nylon produced by casting and polymerizing monomer inside a mold (in-situ polymerization).
Typical strengths: availability of thick plate/block formats, strong suitability for wear parts, and good value in heavy-duty applications—when process control is solid.
Practical note: naming varies by region. To avoid misunderstandings, ask suppliers to confirm extruded vs. cast and the grade standard they follow.
2) Why process matters more than the name
The manufacturing route affects:
thickness availability
internal structure uniformity
machining behavior (especially thick parts)
risk profile (voids/porosity in poorly controlled cast stock)
A simple way to think about it:
Extrusion tends to be consistent in typical thickness ranges.
Casting enables large/thick formats, but requires stronger QC to ensure internal consistency.
3) Side-by-side comparison (buyer-focused)
| Item | PA Nylon Sheet (Extruded PA6/PA66) | MC Nylon Sheet (Cast PA6G / MC Nylon) |
|---|---|---|
| Manufacturing | Melt extrusion | Monomer casting + polymerization |
| Best advantage | Consistency in standard sizes | Thick plate/block availability |
| Typical thickness range | Strong in common sheet sizes | Strong in very thick sections |
| Machining | Predictable, stable | Often excellent; thick machining stock is a key reason to choose it |
| Wear parts | Good (grade dependent) | Often preferred for heavy wear parts (QC-dependent) |
| Main risk | Limited thickness for large parts | Internal defects if supplier control is weak |
| Moisture effect | Absorbs moisture → size change | Same nylon reality: moisture affects dimensions |
4) When MC Nylon (Cast PA6G) is the better choice
Choose cast PA6G / MC nylon sheet (or plate/block) when you need:
A) Thick stock for large machined parts
If your part requires thick material (large wear pads, rollers, guides, heavy liners), cast nylon is often the practical solution.
B) Wear contact under load
Common applications include:
wear plates / sliding pads
conveyor guides and wear strips
rollers and wheels
pulley liners / sheaves
bushings and bearing-related components (design-dependent)
C) Noise reduction and vibration damping
In many machines, nylon can reduce noise and vibration compared to metal-on-metal contact.
Quality tip (important for cast nylon):
If you machine thick parts, confirm the supplier can control internal quality (voids/porosity). A capable supplier should be able to explain their process stability and inspection approach.
5) When extruded PA6/PA66 sheet is the better choice
Choose extruded PA6/PA66 when you prioritize:
A) Standard sizes + consistent supply
For common thickness ranges, extruded sheet is typically easy to source and consistent.
B) General CNC parts with predictable behavior
If your parts are not extremely thick and not extremely load-wear demanding, extruded nylon often performs well.
C) Stiffer options via PA66 or reinforced grades
PA66 (and reinforced variants) is often specified where stiffness or temperature margin is needed.
Note: reinforcement can increase abrasion on mating metal parts—confirm tribology requirements.
6) The engineering reality buyers must plan for: moisture and conditioning
All nylon absorbs moisture. That means:
dimensions can change over time
properties can shift with moisture content
To reduce risk, define measurement and delivery condition:
Is the material supplied dry-as-produced or conditioned?
What are the tolerance expectations, and when are measurements taken?
Best practice: For tight-tolerance parts, discuss conditioning and machining allowances early—before placing the order.
7) A fast selection guide (decision logic)
Choose MC Nylon / PA6G if:
You need thick plate/block or large part stock
The part is a heavy wear component
You want strong value in wear + damping applications
You can verify internal quality and supplier QC
Choose extruded PA6/PA66 if:
You need standard thickness and predictable supply
You prefer a simpler risk profile
You’re producing general CNC parts with moderate wear load
You want consistent batch-to-batch behavior in common sizes
8) What to include in a quote request (copy & paste)
To get accurate pricing and the correct material, send:
Material/process: PA6 / PA66 / PA6G (cast / MC nylon)
Form: sheet / plate / block
Size: thickness × width × length
Quantity: kg + number of sheets (if applicable)
Grade requirements: natural/blue; oil-filled; MoS₂; GF, etc.
Machining: cut-to-size only, or CNC finished parts
Tolerance: cut tolerance vs precision machining tolerance
Application: sliding/rolling/impact/chemical contact/temperature range
Delivery: city + Incoterms (EXW/FOB/CIF)
Target lead time
9) Common mistakes to avoid
Ordering “nylon sheet” without defining PA6/PA66/PA6G and extruded vs. cast
Assuming thicker is always better (thickness impacts internal quality requirements and cost)
Not checking cast nylon internal quality when machining thick parts
Ignoring moisture/conditioning when tight tolerances matter
FAQ
Is MC nylon the same as PA6G?
In many industrial markets, MC nylon commonly refers to cast PA6G, but naming is not universal. Always confirm the manufacturing method: cast vs. extruded.
Which is better for wear parts?
Both can work. For heavy wear parts and thick machining stock, cast PA6G/MC nylon is often chosen—assuming reliable internal quality.
Does cast nylon always outperform extruded nylon?
No. Cast nylon is excellent for thick sections and heavy-duty wear applications, while extruded PA6/PA66 can be more uniform and predictable for standard sheet sizes and certain precision needs.
Ready to source the right nylon sheet?
Send your application + size + tolerance + quantity + delivery city, and we’ll recommend the most suitable option (PA6 / PA66 / cast PA6G/MC nylon) and quote accordingly.
Quick inquiry template:
Material (PA6/PA66/PA6G) + Thickness×Width×Length + Quantity + Tolerance + Application + Delivery City + Incoterms
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