When choosing a KOH 90% supplier, check five criteria: consistent assay verified per batch by a certificate of analysis (CoA, min 90%), a grade that fits your application (soap saponification, biodiesel catalyst, potassium fertilizer), KKDIK registration and a Turkish Safety Data Sheet, local stock versus long import lead times, sample availability, and TRY-based payment terms. KORKİMYA meets these from Istanbul stock.
How to choose a KOH 90% supplier?
Potassium hydroxide (KOH, caustic potash) is a strong inorganic base used in liquid soap saponification, as a catalyst in biodiesel transesterification, and in the production of potassium fertilizer and potassium salts. The 90% solid flake/pellet form is efficient to ship and store because of its high active-substance density. Choosing the right supplier is not only about price: assay consistency, documentation compliance and lead-time reliability directly determine whether your production line runs without interruption.
As a procurement or formulation lead evaluating a supplier, five main headings stand out. We address them in turn below.
Why are assay consistency and the CoA decisive?
The most critical point for KOH 90% is that the product contains at least 90% KOH in every batch and that the impurity limits stay stable. In stoichiometry-sensitive processes such as soap and biodiesel, a fluctuation in assay upsets the catalyst/base dosing and causes yield loss. That is why requesting a certificate of analysis (CoA) for every shipment is the only objective proof of consistency. Values to monitor in a typical specification:
- Potassium hydroxide (KOH): min 90% (active substance).
- Potassium carbonate (K2CO3): max 0.5% (an indicator of carbonation by atmospheric CO2).
- Chloride (Cl): max 0.005% and sulfate (SO4): max 0.002%.
- Sodium (Na): max 1.0% (a quality indicator of the KOH source).
- Iron (Fe): max 0.0002% (important for color and catalytic side effects).
A batch with high carbonate or that has absorbed moisture lowers the effective KOH content, which means you consume more product in the same recipe. Supply without a CoA or that varies batch to batch is a hidden cost.
How to determine the grade that fits your application?
Although KOH 90% has the same CAS number (1310-58-3), purity and impurity sensitivity change with the application. Ask the supplier for grade fit and the relevant impurity limits in writing:
- Soap saponification: consistent assay and low iron/heavy metals matter for product color and foam quality when converting fatty acids into potassium soap.
- Biodiesel catalyst: low water and low carbonate in transesterification determine catalyst efficiency and the control of saponification side reactions.
- Potassium fertilizer and potassium salts: as a potassium source, the chloride and sodium limits affect final product quality.
- pH adjustment and neutralization: consistent base strength is sufficient for process water and general use.
Import or local stock? A supply-model comparison
The biggest operational difference in KOH 90% supply is whether the product is imported directly or comes from local stock. Import can lower the unit cost at large volumes, but it introduces lead-time, exchange-rate and customs uncertainty. Supply from local stock provides speed and predictability for recurring orders. The comparison below summarizes the key distinctions between the two models:
Why are KKDIK, the SDS and regulatory compliance essential?
For a facility supplying chemicals in Türkiye, KKDIK (Registration, Evaluation, Authorization and Restriction of Chemicals) registration and a Turkish Safety Data Sheet (SDS) are a legal requirement. As a corrosive substance, KOH 90% is transported under UN 1813 (packing group II). Your supplier providing these documents in full is non-negotiable for both audit compliance and worker safety. Request the documents before shipment and confirm they are current.
KOH 90% supply with KORKİMYA
KORKİMYA delivers 90% potassium hydroxide (white flake/pellet) ex-stock from its Istanbul warehouse, with fast dispatch from local stock rather than depending on imports. The product is KKDIK-registered; a current Turkish SDS accompanies every shipment and a CoA is provided on request. Invoicing is in Turkish lira (TRY).
- Assay: minimum 90% KOH, verified per batch by CoA.
- Packaging: 25 kg PE bag and 1000 kg big-bag.
- Shelf life: 24 months, protected from moisture and CO2.
- Ex-stock delivery: fast dispatch from the Istanbul warehouse, TRY-based invoicing.
- Sample and price quote: complete the inquiry form in a few minutes.
What should I watch for when choosing a KOH 90% supplier?
Check five criteria: consistent assay verified per batch by CoA (min 90%), a grade that fits your application (soap, biodiesel, fertilizer), KKDIK registration and a Turkish SDS, local stock versus import lead times, and sample availability with TRY payment terms. KORKİMYA meets these from Istanbul stock.
How do I get a KOH 90% price / quote?
You can request a price quote from the inquiry form on the potassium hydroxide 90% product page, with packaging (25 kg PE bag or 1000 kg big-bag) and quantity. KORKİMYA invoices in TRY; the quote and certificate of analysis (CoA) are provided on request.
Is local-stock supply of KOH 90% possible in Türkiye?
Yes. KORKİMYA delivers 90% potassium hydroxide ex-stock from its Istanbul warehouse, providing faster and more predictable supply for recurring orders compared with long import lead times. For current stock, request a quote from the product page.
Can I request a KOH 90% sample?
Yes. Simply state your intent (sample or quote), quantity and destination in the form on the product page. With a sample you can verify the assay and impurity values in your own application in advance.