Nylon 66 (PA66)
The Nylon 66 engineering resin supplied by Chelora Chemicals — a two-monomer polyamide with a higher melting point and stiffness than Nylon 6 — exported from Indonesia as virgin pellet with full batch documentation on every shipment.
What Nylon 66 is, and why buyers source it
A working overview of the resin's two-monomer chemistry, how its exact 1:1 monomer stoichiometry sets it apart from Nylon 6, and the grades Chelora Chemicals keeps in regular supply.
Nylon 66 is a polyamide built from two monomers in precise 1:1 stoichiometric balance — a dicarboxylic acid (adipic acid) and a diamine (hexamethylenediamine) — condensed together to form the same type of repeating amide linkage found in every nylon, but arranged along a backbone with a longer, more regularly spaced repeat unit than Nylon 6's single-monomer structure. That longer, more symmetric repeat unit packs more tightly into crystalline regions, which is the structural reason Nylon 66 carries a notably higher melting point, greater stiffness and better heat resistance than Nylon 6.
At room temperature it is supplied as a translucent to opaque white pellet, semi-crystalline once cooled. Like Nylon 6, it is markedly hygroscopic and its finished-part properties shift measurably between the dry-as-moulded and moisture-equilibrated states, a characteristic of the amide backbone shared by every commercial nylon regardless of which monomers built it.
Where it fits in the value chain
Nylon 66's higher heat resistance and stiffness relative to Nylon 6 make it the preferred nylon wherever an application runs hotter or needs greater dimensional stability under load: automotive radiator end tanks, engine covers and connectors operating in the under-hood environment, electrical connectors subject to reflow-soldering temperatures, and industrial gears and bearings running under continuous load. It also remains an important textile fibre, historically the original nylon fibre, used in carpet, hosiery and technical textile applications, often in direct competition with Nylon 6 fibre on cost and specific property requirements.
Grades we supply
Chelora Chemicals offers Nylon 66 across injection-moulding, fibre/yarn and glass-fibre-reinforced grades, differentiated mainly by relative viscosity and additive package. Each grade is supplied with a batch-wise certificate of analysis covering relative viscosity, moisture content and, for reinforced grades, glass content.
How Nylon 66 is produced
An overview of the production route for orientation purposes. Our manufacturing partners' own process parameters and in-process controls are proprietary and are not disclosed beyond what is needed to interpret the certificate of analysis.
Nylon 66 is produced by condensation polymerisation of adipic acid with hexamethylenediamine. The two monomers are first combined in water in a precisely controlled 1:1 molar ratio to form nylon salt (hexamethylenediammonium adipate), a crystallisable intermediate that is itself a useful quality-control checkpoint, since its formation confirms the exact stoichiometric balance needed for the final polymer's molecular weight to build up correctly. The nylon salt solution is then concentrated and heated under pressure, driving off water as polycondensation proceeds and the amide linkages form along the growing chain.
Because the reaction is a step-growth condensation between two different monomers rather than a ring-opening of a single one, achieving a high molecular weight depends critically on that initial 1:1 stoichiometric balance: even a small excess of either monomer caps chain growth early and limits the achievable molecular weight, which is why nylon salt formation and careful monomer metering are treated as the single most important process control point in Nylon 66 manufacture.
Industries and processes that use it
Nylon 66 is consumed across automotive under-hood parts, electrical connectors, industrial gears and bearings, and textile fibre. The fields below account for most of the demand we see through our export desk.
Automotive Under-Hood Parts
Glass-fibre-reinforced grades injection-moulded into radiator end tanks, engine covers, air intake manifolds and connectors operating in the high-temperature engine-bay environment.
Electrical & Electronic Connectors
Moulded into connectors and components that must withstand reflow-soldering temperatures and maintain dimensional stability under thermal cycling.
Industrial Gears & Bearings
Moulded into gears, bearings, bushings and wear components where strength, stiffness and continuous-load heat resistance exceed what Nylon 6 reliably offers.
Textile & Carpet Fibre
Melt-spun into continuous filament and staple fibre for carpet, hosiery and technical textiles, the original commercial nylon fibre application.
How the resin is typically converted forward
The two-monomer, tightly crystallising amide structure governs almost all of Nylon 66's further processing behaviour. The categories below account for most of the ways it is converted into a finished part.
Drying
The hygroscopic resin is dried to a specified low moisture level before melt processing, since residual moisture can cause hydrolytic chain scission and surface defects during moulding or spinning.
Injection Moulding
Melted and injected into a mould cavity under pressure, typically with glass-fibre reinforcement, to form automotive, electrical and industrial parts needing stiffness and heat resistance.
Fibre Spinning
Melted resin is extruded through fine spinnerets and drawn to orient the polymer chains, producing continuous filament or staple fibre for carpet and technical textile applications.
Glass-Fibre Compounding
Chopped glass fibre is melt-compounded into the resin at a controlled loading to raise stiffness and heat deflection temperature for demanding automotive and electrical applications.
Nylon 66 against its two feedstock monomers and the Nylon 6 alternative we supply
Buyers sourcing Nylon 66 resin often also need its exact monomer pair, or want to compare it against the single-monomer Nylon 6 route. A quick reference to what else is on our regular supply list.
| Product | CAS Number | Category | Notes |
|---|---|---|---|
| Nylon 66 (PA66) | 32131-17-7 | Two-monomer polyamide | The product on this page — a high-melting-point, high-stiffness engineering resin and fibre polymer. |
| Adipic Acid | 124-04-9 | Dicarboxylic acid monomer | One half of this resin's exact 1:1 monomer pair — see its product page. |
| Hexamethylenediamine (HMDA) | 124-09-4 | Diamine monomer | The other half of this resin's exact 1:1 monomer pair — see its product page. |
| Nylon 6 (PA6) | 25038-54-4 | Single-monomer polyamide | The lower-melting-point nylon made from a simpler, single-monomer route — see its product page. |
Exact physical constants and processing specifications are confirmed per batch on the certificate of analysis — treat the notes above as a sourcing guide, not a specification sheet, for products other than Nylon 66.
Safety classification at a glance
Based on GHS classification as commonly listed for this substance. This is a summary for orientation only — always work from the current safety data sheet supplied with your specific batch.
Not classified as hazardous under GHS in solid pellet form.
Combustible; pellets and especially fine dust can support combustion once ignited.
Minimise accumulation of polymer dust/fines, which present a greater ignition risk than pellets.
Processing equipment handles the resin molten at comparatively high temperature given its higher melting point; standard hot-surface and fume-extraction precautions apply at the extruder.
Standard gloves and eye protection are sufficient for routine handling of pellets.
Not a safety hazard, but a critical process-quality factor; always dry before processing per the technical data sheet.
Not classified; refer to the batch MSDS for grade-specific guidance.
This product has a low hazard profile in its solid pellet form and is not classified as hazardous under GHS. The principal handling precautions concern combustible-dust accumulation from fines generated during conveying and bagging, and standard hot-surface precautions during melt processing at the resin's comparatively high processing temperature. Full first-aid, storage, spill and PPE guidance is in the MSDS issued with every shipment, and should be read in full before this material is handled.
Keeping it on spec between delivery and use
General storage guidance for this grade. Site-specific storage rules, segregation requirements and re-test intervals should follow your own EHS procedures and the MSDS issued with your batch.
Store in a dry, ambient-temperature warehouse in the original moisture-barrier packaging, since Nylon 66 is markedly hygroscopic and will absorb atmospheric moisture steadily once the packaging is opened. Keep bags sealed until immediately before processing, and always pre-dry per the technical data sheet regardless of how recently the material was delivered. Re-check relative viscosity on material held past its retest date before use.
How it ships from Indonesia
Standard packing and export terms for this product. Confirm exact figures against your order — they vary slightly by destination and quantity.
What travels with every batch
Specification is agreed before the purchase order, not discovered on arrival. Every shipment of Nylon 66 (PA66) leaves with a documented, checkable paper trail.
Certificate of Analysis
Batch-wise assay, colour and key physical constants, issued against the agreed specification so your QC team can check it, not just file it.
Safety Data Sheet
GHS-format SDS in English covering hazard classification, handling, storage, first-aid and spill response for the exact grade shipped.
Technical Data Sheet
Reference physical and chemical properties, recommended storage and typical applications, for internal circulation to your process or R&D teams.
Certificate of Origin
Confirms Indonesian origin for customs clearance and any preferential-duty claim at your destination port.
Dangerous Goods Declaration
UN packing group, classification and shipper's declaration prepared ahead of loading so documentation never holds up customs.
Third-Party Inspection
Independent pre-shipment inspection and re-sampling can be arranged on request, at your cost, for buyers who require it as a matter of policy.
Frequently asked questions
What buyers most often ask our sales desk about this grade.
01What is Nylon 66 used for?+
02What is Nylon 66 made from?+
03How is Nylon 66 produced?+
04What grades does Chelora Chemicals supply?+
05Is Nylon 66 hazardous?+
06Why does Nylon 66 have a higher melting point than Nylon 6?+
07What packing options are available?+
08How long does delivery take?+
09Can I get a sample before placing a bulk order?+
10Do you supply the adipic acid and HMDA monomers and the Nylon 6 alternative as well?+
Need Nylon 66 on spec, on time?
Send us your required grade, relative viscosity, glass content and destination port. Our desk quotes most enquiries within one working day.