Nylon 6 vs Nylon 66 — Engineering Plastic Selection Guide

nylon 6 plastic pellets granules industrial packaging

Chemical Structure Differences

The fundamental difference between PA6（尼龍 6） 和 PA66 (Nylon 66) lies in their molecular structure:

Nylon 6: Made from caprolactam, has 6 carbon atoms in each repeating unit. Less crystalline structure.
Nylon 66: Made from hexamethylenediamine and adipic acid, has two 6-carbon chains. More crystalline structure.

Mechanical Properties Comparison

財產	PA6	PA66
拉伸強度	70-85 MPa	80-100 MPa
彎曲模量	2.5-3.0 GPa	2.8-3.5 GPa
斷裂伸長率	30-100%	15-60%
Notched Izod Impact	50-100 J/m	40-80 J/m
熔點	220°C	260°C
HDT at 1.8 MPa	70°C	90°C

吸濕性

Moisture absorption is critical for nylon applications:

Condition	PA6	PA66
At 50% RH	2.5-3.0%	2.0-2.5%
Saturation	8-10%	6-8%

Processing Characteristics

Nylon 6 Processing

Melting Point: 220°C
Processing Range: 240-280°C
模具溫度： 40-80°C

Nylon 66 Processing

Melting Point: 260°C
Processing Range: 280-320°C
模具溫度： 60-90°C

Applications by Material

Nylon 6 Applications

Gears and sprockets
Industrial monofilament
Film and packaging
Consumer products

Nylon 66 Applications

Automotive under-hood components
Electrical connectors
High-temperature bearings
Precision mechanical components

Reinforced Grades

Both materials are commonly reinforced with glass fiber:

等級	PA6 + GF30	PA66 + GF30
拉伸強度	140-160 MPa	170-200 MPa
HDT (1.8 MPa)	205°C+	250°C+
吸濕性	1.0-1.5%	0.8-1.2%

Selection Summary

Choose Nylon 6 when:

Impact resistance is critical
Cost sensitivity is high
Operating temperatures are moderate

Choose Nylon 66 when:

Higher mechanical strength is required
Elevated temperatures are expected
Dimensional stability is critical

常見問題

When is Nylon 6 vs Nylon 66 — Engineering Plastic Selection Guide a good option?

Nylon 6 vs Nylon 66 — Engineering Plastic Selection Guide is a good option when fast iteration, complex geometry, low tooling cost, or low-volume production is more important than molded-part unit cost.

What should be checked before choosing Nylon 6 vs Nylon 66 — Engineering Plastic Selection Guide?

檢查零件尺寸、材料特性、表面光潔度、尺寸公差、受熱情況、負載方向，以及是否需要後加工。.

How does Nylon 6 vs Nylon 66 — Engineering Plastic Selection Guide compare with CNC machining?

3D 列印可以快速製造複雜的形狀，而 CNC 加工通常在精密表面、更小的公差和生產級材料方面更強。.

What affects the cost of Nylon 6 vs Nylon 66 — Engineering Plastic Selection Guide?

成本取決於材料、建置量、列印時間、層高、支撐移除、精加工、檢查以及建置中的零件數量。.

Nylon 6 vs Nylon 66 — Frequently Asked Questions

Is Nylon 66 stronger than Nylon 6?

Yes. Nylon 66 typically offers 15-25% higher tensile strength (80-100 MPa vs 70-85 MPa) due to more crystalline structure.

Which nylon is better for gears?

Both work well. PA6 is preferred for impact-loaded gears due to higher toughness. PA66 is better for high-load, high-temperature applications.

Where can I source quality PA6 and PA66 granules?

Nylonplastic supplies both grades in natural, colored, and reinforced versions. Contact us for samples.

尼龍 6 vs 尼龍 66 - 工程塑膠選擇指南

Chemical Structure Differences

Mechanical Properties Comparison

吸濕性