Nylon feedstock
Adipic acid is used in nylon 6,6 chemistry with the appropriate diamine partner. [3]
01
THE ESSENTIALS
Adipic Acid in 30 Seconds
The two acidic ends are farther apart than in succinic or malonic acid. The longer chain changes the building block delivered to a polymer.
Adipic acid is a six-carbon diacid with a four-carbon spacer between its carboxyl groups. It is an important feedstock in polymer chemistry, especially nylon and polyester-related processes. [1] [3]
A condensed structural formula keeps the functional groups visible. [1]
Polyester chemistry
Used to prepare polyester polyols and other specified polyester derivatives.. [3]
Ester intermediates
A precursor for adipate esters used in industrial formulations, including plasticizer contexts.. [3]
Commercial availability
The supplier section separates package size, assay, grade, and market context for three named products. [4]
02
GO A LITTLE DEEPER
Understanding Adipic Acid
THE SIMPLE EXPLANATION
The functional groups
The two acidic ends are farther apart than in succinic or malonic acid. The longer chain changes the building block delivered to a polymer. [1]
A LITTLE DEEPER
What the structure changes
In polymer chemistry, the spacing of functional groups is part of the product design. Two diacids with similar acid–base behavior can still produce different polymer backbones. [1] [4] [5] [6]
Technical detail Identity, dissociation & specification
Compiled aqueous pKa reports near 25 °C include approximately 4.418/5.412 and 4.44/5.44. The page rounds these to 4.4/5.4 for orientation rather than implying precision beyond the source variation. [1] [2] [4] [5] [6]
Acid–base reference values describe equilibria under specified conditions. They are not a substitute for a validated formulation or an assay on the purchased lot.
03
MAKE THE CONNECTION
How Adipic Acid Compares
Similar names and functional groups do not mean interchangeable chemicals.
SIDE-BY-SIDE COMPARISON
Adipic Acid vs Succinic Acid
Dicarboxylic acid
versusDicarboxylic acid
Fixed comparison for this prototype. Acid selectors are disabled; additional comparisons are coming later.
| Property | Adipic Acid | Succinic Acid |
|---|---|---|
| Molecular formula | C₆H₁₀O₄ [1] | C₄H₆O₄ [7] |
| Molecular weight | 146.14 g/mol [1] | 118.09 g/mol [7] |
| Carbon atoms | 6 [1] | 4 [7] |
| Carboxyl groups | 2 [1] | 2 [7] |
| Structure | HOOC–(CH₂)₄–COOH [1] | HOOC–CH₂–CH₂–COOH [7] |
| Chemical family | Dicarboxylic acid [1] | Dicarboxylic acid [7] |
| Identity focus | Solid [1] | Solid [7] |
| pKa context | ≈4.4 / 5.4 (25 °C) [2] | 4.207 / 5.635 (25 °C) [11] |
Chemical identities are compared here; supplier grades, concentrations, and stereochemical specifications are separate purchasing attributes. pKa values retain their stated conditions; no quantitative solubility ranking is implied.
When Might You Choose One Instead of the Other?
Choose adipic acid when the formulation or synthesis specifies its six-carbon diacid framework. Choose succinic acid when the four-carbon framework is intended. Manufacturing purchases require process-specific impurity and packaging specifications. [1] [3] [7]
Specified starting material
Adipic Acid
Match HOOC–(CH₂)₄–COOH and the method’s required chemical form.
Succinic Acid
Match HOOC–CH₂–CH₂–COOH; verify the identity before substituting a related acid.
Before choosing: match the reaction or formulation, then verify the exact form, grade, assay basis, and impurities. These contexts do not establish suitability for an industrial or regulated application.
04
FROM STRUCTURE TO APPLICATION
What Is Adipic Acid Used For?
Nylon feedstock
Adipic acid is used in nylon 6,6 chemistry with the appropriate diamine partner. Nylon properties belong to the polymer, not the free acid. [3]
Polyester chemistry
Used to prepare polyester polyols and other specified polyester derivatives. [3]
Ester intermediates
A precursor for adipate esters used in industrial formulations, including plasticizer contexts. [3]
06
SOURCE WITH CONTEXT
Adipic Acid Suppliers
Compare specific products and package options. Listings are not ranked recommendations.
3 suppliers · 3 products · 6 package listingsLatest supplier check: October 3, 2026
Package sizes stay grouped under the supplier product. Assay methods, product forms, and regional markets remain visible. Specify process-specific impurity limits and the six-carbon diacid identity.
Scroll horizontally if needed. Supplier and package identity stay visible.
| Supplier | Product / Grade | Purity / Assay | Package Size | Public Price | Normalized Price | Documentation | Last Checked | Action |
|---|---|---|---|---|---|---|---|---|
| Sigma-AldrichAdipic Acid | Check supplierA26357-100G | 99% | 100 g | $31.70USD · US public price | Not comparedGrades, assay bases, or forms differ | COA lookup on product page (opens new tab)SDSCheck supplierCOO lookup on product page (opens new tab) Document notes: Sigma-Aldrich
| View Product: Sigma-Aldrich, A26357-100G (opens new tab) | |
| Check supplierA26357-500G | 99% | 500 g | $37.20USD · US public price | Not comparedGrades, assay bases, or forms differ | View Product: Sigma-Aldrich, A26357-500G (opens new tab) | |||
| TCIAdipic Acid | Check supplierA0161 | >99.0% (GC and titration) | 25 g | $17.00USD · US public price | Not comparedGrades, assay bases, or forms differ | Document notes: TCI
| View Product: TCI, A0161 (opens new tab) | |
| Check supplierA0161 | >99.0% (GC and titration) | 500 g | $19.00USD · US public price | Not comparedGrades, assay bases, or forms differ | View Product: TCI, A0161 (opens new tab) | |||
| FUJIFILM WakoAdipic Acid | Wako Special Grade013-00932 | ≥99.5% (titration) | 25 g | $25.00USD · US list price | Not comparedGrades, assay bases, or forms differ | Document notes: FUJIFILM Wako
| View Product: FUJIFILM Wako, 013-00932 (opens new tab) | |
| Wako Special Grade017-00935 | ≥99.5% (titration) | 500 g | $37.00USD · US list price | Not comparedGrades, assay bases, or forms differ | View Product: FUJIFILM Wako, 017-00935 (opens new tab) |
Sigma-Aldrich
Adipic Acid
Check supplier
100 g
A26357-100G- Public price
- $31.70USD · US public price
- Normalized price
- Not comparedGrades, assay bases, or forms differ
500 g
A26357-500G- Public price
- $37.20USD · US public price
- Normalized price
- Not comparedGrades, assay bases, or forms differ
Documentation
COA lookup on product page (opens new tab)SDSCheck supplierCOO lookup on product page (opens new tab)
Document notes: Sigma-Aldrich
- A product-specific certificate retrieval option was visible; no lot certificate was reviewed. Open the product page and use its certificate section.
- A current regional SDS was not verified in this pass.
- A product-specific Certificate of Origin retrieval option was visible; no origin certificate was reviewed. Country of origin is unverified and is not inferred.
Last checked:
TCI
Adipic Acid
Check supplier
25 g
A0161- Public price
- $17.00USD · US public price
- Normalized price
- Not comparedGrades, assay bases, or forms differ
500 g
A0161- Public price
- $19.00USD · US public price
- Normalized price
- Not comparedGrades, assay bases, or forms differ
Documentation
Document notes: TCI
- A product-specific certificate retrieval option was visible; no lot certificate was reviewed. Open the product page and use its certificate section.
- A current regional SDS was not verified in this pass.
- Origin-document availability was not verified. Country of origin is unverified and is not inferred.
Last checked:
FUJIFILM Wako
Adipic Acid
Wako Special Grade
25 g
013-00932- Public price
- $25.00USD · US list price
- Normalized price
- Not comparedGrades, assay bases, or forms differ
500 g
017-00935- Public price
- $37.00USD · US list price
- Normalized price
- Not comparedGrades, assay bases, or forms differ
Documentation
Document notes: FUJIFILM Wako
- A product-specific certificate retrieval option was visible; no lot certificate was reviewed. Open the product page and use its certificate section.
- A current regional SDS was not verified in this pass.
- Origin-document availability was not verified. Country of origin is unverified and is not inferred.
Last checked:
Documentation evidence
COA = Certificate of Analysis · SDS = Safety Data Sheet · COO = Certificate of Origin.
Lookup means a retrieval option was visible, not that a lot certificate was reviewed. Check supplier means availability or the applicable document was not verified.
Prices may vary by quantity, account, contract, geography, and availability. These products have different grades, assay bases, or forms; no normalized comparison is shown. Foreign-market prices are reference listings only. No currency conversion, mass-to-volume conversion, or ranking is applied. Confirm equivalent specifications and a current quote before comparison. [4] [5] [6]
Verification limits & placement policy
Sigma’s grade designation and assay method are not established by the 99% label. Promotional 25 g pricing was omitted; verified unambiguous packages are retained.
Only the displayed identity, specification, packages, public prices and stated documentation evidence were reviewed. Current stock, lead times, shipping eligibility, contract pricing, lot certificates, and regulatory suitability are unverified.
There are no paid placements. Future paid listings will show “Sponsored” in both views; payment will not determine chemistry interpretation or imply a ranking.
07
PLAN A LARGER ORDER
Need Adipic Acid in Bulk?
Turn your requirements into a clear supplier brief.
Bulk RFQ feature — coming soon. Prototype form: submissions are not currently sent to suppliers. Use sample details to prepare an on-screen brief.
Prepare a bulk request Prototype form
08
A BUYER’S CHECKLIST
Before You Buy Adipic Acid
Selections remain only while this page is open.
09
FOR YOUR REFERENCE
Adipic Acid Technical Reference
Identity, product reference properties, and handling context.
Identification Names, formula & identifiers
- Principal CAS
- 124-04-9
- Identity focus
- Solid
- Formula
- C₆H₁₀O₄
- Molecular weight
- 146.14 g/mol
- IUPAC name
- hexanedioic acid
- Connectivity SMILES
- C(CCC(=O)O)CC(=O)O
- PubChem CID
- 196
Connectivity SMILES describes connectivity; it is not an independent stereochemical assignment. CAS and product-form distinctions are supported by the supplier listings. [1] [4] [5] [6]
Physical Properties Product references & conditions
Acid/Base Properties Verified values & missing data
Reference pKa: ≈4.4 / 5.4 (25 °C). [2]
Sigma’s grade designation and assay method are not established by the 99% label. Promotional 25 g pricing was omitted; verified unambiguous packages are retained.
Temperature, ionic strength, and the use of activities versus concentrations matter in quantitative work. These reference values are not buffer recipes.
Safety Product-specific SDS
Review the current SDS for the exact product.
Match chemical form, concentration, region, and product code. Use its handling, storage, incompatibility, first-aid and disposal guidance alongside the workplace risk assessment.
A current regional SDS remains to be verified; the supplier documentation field says Check supplier. This profile is not a substitute for that document.
Review supplier documentation10
COMMON QUESTIONS
Adipic Acid FAQ
What distinguishes Adipic Acid?
The two acidic ends are farther apart than in succinic or malonic acid. The longer chain changes the building block delivered to a polymer. [1]
How does it differ from Succinic Acid?
Adipic acid has six carbons; succinic acid has four. Their shared diacid functionality does not make them equivalent polymer feedstocks, because chain length becomes part of the product structure. [7]
What must a buyer specify?
Specify process-specific impurity limits and the six-carbon diacid identity. [4]
Are the listed products directly price-comparable?
No. The table retains differing grades, assay bases, forms, and markets. No normalized ranking or currency conversion is applied. [5]
What reference data still need checking?
Sigma’s grade designation and assay method are not established by the 99% label. Promotional 25 g pricing was omitted; verified unambiguous packages are retained. [6]
Can I request a bulk quote here?
The RFQ is a prototype that prepares an on-screen brief. Nothing is sent to suppliers. Confirm actual bulk terms directly with the supplier. [4]
11
TRACE THE INFORMATION
Sources & Editorial Notes
Identity and compiled reference values are separated from supplier-specific specifications. Structural comparisons and buyer guidance are editorial interpretation. Sources were checked October 3, 2026; supplier information can change.
- PubChem · chemical identity (opens new tab)
Official PUG REST identity record: formula, molecular weight, IUPAC name, and connectivity SMILES.
- PubChem · dissociation references (opens new tab)
Compiled reference entries; their methods and conditions matter. Citric acid’s displayed stepwise values are from the linked Sigma specification.
- PubChem · applications (opens new tab)
Compiled application references; uses of derivatives are distinguished from direct use of the acid.
- Sigma-Aldrich · commercial product (opens new tab)
Direct product listing checked October 3, 2026. Product-specific grade, assay, package, public price and documentation retrieval evidence.
- TCI · commercial product (opens new tab)
Direct product listing checked October 3, 2026. Product-specific grade, assay, package, public price and documentation retrieval evidence.
- FUJIFILM Wako · commercial product (opens new tab)
Direct product listing checked October 3, 2026. Product-specific grade, assay, package, public price and documentation retrieval evidence.
- Succinic Acid · identity (opens new tab)
Primary comparison identity. Explanations of structural differences are editorial interpretation of verified identities.
- Malonic Acid · identity (opens new tab)
Related chemical identity; relevance is based on structure or the stated application relationship.
- Fumaric Acid · identity (opens new tab)
Related chemical identity; relevance is based on structure or the stated application relationship.
- Citric Acid · identity (opens new tab)
Related chemical identity; relevance is based on structure or the stated application relationship.
- Succinic Acid · acid–base reference (opens new tab)
The primary comparison’s pKa source; reference conditions are preserved.
- OpenStax · Citric acid cycle (opens new tab)
Succinate and fumarate in the citric acid cycle; salts/ions are distinguished from purchased free acids.
Review limits
Sigma’s grade designation and assay method are not established by the 99% label. Promotional 25 g pricing was omitted; verified unambiguous packages are retained.
This informational prototype is not a supplier, quotation service, or endorsement of a product’s fitness for an application. Buyers should verify the applicable specification, certification, and regulatory requirements for their intended use.