1 4-Cyclohexanedicarboxylic Acid Isomer Ratio & Storage Quality Issues

1 4-Cyclohexanedicarboxylic Acid

A procurement manager at a Taiwanese polyester resin manufacturer spent most of a Tuesday afternoon in a phone call with a German coatings customer — and the argument boiled down to a single question: why did the batch look slightly off-white when it should have been white? The answer, once they traced it, was 1 4-Cyclohexanedicarboxylic Acid (CAS 1076-97-7) that had sat in a non-temperature-controlled warehouse for six weeks before processing. The compound itself was fine; the handling was not.

♦1 4-Cyclohexanedicarboxylic Acid is a saturated aliphatic diacid used primarily in polyester resins, powder coatings, and plasticizer synthesis. The molecule exists as a mixture of cis and trans isomers, and the trans content — typically 55–75% in commercial grades — matters to formulators because it affects crystallization behavior and final resin properties. A buyer sourcing this material for a high-performance TGIC-free powder coating system and one sourcing it for general-purpose polyol synthesis have quite different reasons to care about that isomer ratio, and the CoA does not always make those details visible up front.
 
The quality problems that come up most often with this compound are not purity failures in the conventional sense. An assay of 99.0% by HPLC area percent can mask an isomer distribution that has drifted — either through prolonged heat exposure during storage or through variability in the hydrogenation process upstream. A second issue that shows up in practice is residual metal catalyst content from the production route, particularly palladium or nickel depending on the manufacturer. These trace metals are not always tested or listed on a standard CoA, and they matter for sensitive resin applications where they can interfere with catalyst systems downstream.
Before placing an order, ask specifically: what is the trans isomer percentage in the lot you will ship, and what method is used to determine it? Ask for the residual metal specification and the result from the current lot. Neither question is unusual — any serious manufacturer of 1 4-Cyclohexanedicarboxylic Acid has this data. If the answer is vague, that tells you something about how the product is actually being made and tested.
 
Shandong Lookchemical Co., Ltd. supplies 1 4-Cyclohexanedicarboxylic Acid (CAS 1076-97-7) with batch-specific CoA documentation that includes isomer distribution by HPLC, HPLC purity, melting point, and residual solvent data. Packaging uses moisture-barrier multi-layer bags to prevent hydration during transit, particularly relevant for shipments crossing multiple climate zones. MOQ is 1 kg for qualification lots; commercial quantities are available with lead times of 5 to 10 business days for standard grades.
1 4-Cyclohexanedicarboxylic Acid
The procurement manager in that Tuesday phone call eventually traced the issue, reworked the affected batch, and updated his incoming inspection protocol to include a storage-temperature check on all incoming diacid shipments. The German customer was satisfied once the cause was clear. That kind of problem does not go away by itself — it needs a supplier who can provide enough process transparency that you can tell exactly where in the chain something went wrong. Contact Shandong Lookchemical: sales01@sdlookchemical.com | sdlookchem.com.

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