Bảng tương thích hóa học của nylon: PA6, PA66 và PA12 – Tham khảo nhanh

Bảng tương thích hóa học của nylon is the quickest way to compare PA6, PA66, and PA12 against fuels, oils, water, acids, alkalis, and common solvents. The best choice usually depends on exposure, temperature, and load, not just the resin name.

This page is a quick-reference support guide, not a replacement for full testing. If you need a deeper breakdown by chemical class or failure mechanism, see our Hướng dẫn về khả năng chịu hóa chất của nylon. If moisture or outdoor weathering will also affect the part, review khả năng hút ẩm của nylon và Nylon chống tia UV, chịu được thời tiết ngoài trời before final material selection.

Tổng quan

Chemical / Environment	PA6	PA66	PA12	Best First Check
Water / high humidity	Công bằng	Công bằng	Tốt	PA12 where low moisture uptake matters.
Gasoline / diesel / oils	Tốt	Tốt	Tuyệt vời	PA12 for fuel and fluid handling.
Weak alkalis	Công bằng	Công bằng	Tốt	Check temperature and stress first.
Strong alkalis	Kém	Kém	Công bằng	Nylon is usually not the best long-term choice.
Axit yếu	Công bằng	Công bằng	Từ trung bình đến khá	Short exposure may be acceptable.
Strong mineral acids	Kém	Kém	Kém	Consider other engineering plastics.
Các loại cồn	Tốt	Tốt	Tốt	Nylons often tolerate alcohols well.
Hydrocarbon solvents	Tốt	Tốt	Tuyệt vời	PA12 usually gives the best stability.
Chlorinated / aggressive solvents	Kém	Kém	Công bằng	Always verify with test data first.
Outdoor weathering + fluid exposure	Công bằng	Công bằng	Tốt	UV package, color, and wall thickness matter.

How to read the chart: “Excellent” means nylon is often suitable with normal design controls. “Good” means the grade is commonly used but still needs confirmation of temperature and time. “Fair” means service may be possible in controlled conditions but should not be assumed safe by default. “Poor” means nylon is usually the wrong first choice unless exposure is brief or non-critical.

Which Grade Usually Comes First

PA12 usually gives the broadest real-world compatibility inside the nylon family, especially where fuels, oils, and low moisture uptake matter. That is why PA12 often appears in fluid handling, tubing, and outdoor assemblies.

PA66 is commonly selected when heat resistance, stiffness, and creep performance matter more than moisture resistance. It can still perform well in oils and fuels, but its higher moisture uptake can shift dimensions over time.

PA6 is often the most cost-effective engineering nylon for general use, but it is also the grade where designers most often underestimate moisture effects and chemical sensitivity under long exposure.

Tại sao tính tương thích của nylon lại thay đổi nhiều đến vậy?

The same nylon grade can behave very differently depending on concentration, temperature, exposure time, mechanical stress, moisture history, and fillers or additives. That is why a simple “nylon is resistant” statement is unreliable.

• Chuyên ngành: diluted cleaners and concentrated acids are not the same case.
• Nhiệt độ: heat accelerates swelling, hydrolysis, and stress cracking.
• Thời gian phơi sáng: splash contact is not the same as immersion.
• Áp lực cơ học: loaded parts can fail earlier than test coupons.
• Lịch sử độ ẩm: conditioned nylon may react differently than dry-as-molded nylon.
• Chất phụ gia: sợi thủy tinh, chất ổn định tia UV và chất cải thiện độ bền va đập có thể làm thay đổi hiệu suất.

When This Chart Is Enough, and When It Is Not

This chart is useful for early screening, quick grade comparison, shortlist creation, and routing users into the correct deeper technical page. It is not enough for regulated fluid-contact applications, hot chemical immersion, long-term outdoor chemical exposure, or mixed chemical plus thermal cycling.

For broader cross-material comparison, use our Bảng tương thích các loại nhựa kỹ thuật. For nylon-specific detail by fluid family and failure mechanism, return to the full Hướng dẫn về khả năng chịu hóa chất của nylon.

Quick Shortlist by Application

If your application needs…	Usually check first	Tại sao
Fuel and oil resistance with low moisture uptake	PA12	Best balance of fluid resistance and dimensional stability.
Higher heat and stiffness for structural parts	PA66	Often better when thermal and structural load dominate.
Lower-cost general engineering nylon	PA6	Often the most economical starting point.
Outdoor service with sunlight and moisture cycling	UV-stabilized PA12 or stabilized PA66	Environmental durability depends on chemistry and weathering package.
Aggressive solvents or strong mineral acids	Do not assume nylon	Another engineering plastic may be a better first candidate.

Bài đọc liên quan

• Nylon 6 so với Nylon 66
• PA6 so với PA12
• Nylon Chemical Resistance Guide
• Nylon chống tia UV, chịu được thời tiết ngoài trời

Câu hỏi thường gặp

Is nylon chemically resistant?

Yes, but only in a conditional sense. Nylon can perform well in oils, fuels, and some alcohols, but resistance changes significantly with grade, temperature, concentration, and exposure time.

Which nylon grade has the best chemical compatibility?

PA12 usually offers the best overall compatibility when fuels, moisture control, and dimensional stability matter. PA66 and PA6 can still be better choices when cost, heat resistance, or stiffness dominate the design brief.

Is PA66 more chemical resistant than PA6?

Not always. PA66 often wins on heat and stiffness, but PA6 and PA66 can both be outperformed by PA12 in moisture-sensitive and fuel-related environments. Use the specific fluid and temperature as the deciding factor.

Does nylon resist acids and bases?

Nylon usually performs poorly in strong mineral acids and strong alkalis. Weak or short-term exposure may be manageable in some cases, but it should not be assumed safe without confirmation.

What is the difference between nylon chemical resistance and nylon chemical compatibility?

In practice they are often used interchangeably, but “compatibility” usually implies a more application-focused judgment that includes exposure time, stress, and dimensional stability, not just lab resistance data.

Need Help Choosing the Right Nylon Grade?

If your part will see fuels, cleaners, solvents, humidity, or outdoor cycling, material choice should be made with both environment and manufacturing process in mind. We can help compare PA6, PA66, PA12, and reinforced or stabilized variants for molding, extrusion, machining, or additive manufacturing.

Nếu quý vị đang chuyển từ giai đoạn sàng lọc nguyên liệu sang giai đoạn sản xuất, hãy tham khảo nhựa kỹ thuật nylon trang về các tùy chọn điểm, Dịch vụ đúc phun nylon đối với các chi tiết đúc, Dịch vụ gia công CNC trên vật liệu nylon đối với các chi tiết gia công, và Dịch vụ in 3D bằng nylon dành cho các mẫu thử nghiệm hoặc các bộ phận chức năng sản xuất với số lượng ít.