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Isothiazolinone Prices, Demand and Supply Overview
Isothiazolinone prices in Germany, the highest-cost reporting region, rose 5.9% in H1 2026, climbing from USD 3.889/KG in Q1 to USD 4.121/KG in Q2 as specialty chemical precursor cost firming and recovering paints and coatings sector biocide procurement drove consistent buying following the Q3 2025 seasonal dip. Globally, the average rose from USD 2.855/KG in Q1 to USD 3.026/KG in Q2, a 6.0% gain. For H2 2026, a global average of USD 3.04-3.42/KG is expected, with continued support from paint and water treatment biocide demand recovery, recovering architectural coatings sector procurement, and specialty chemical input cost firming across Asian and European producing markets.
Isothiazolinones are a class of heterocyclic sulphur-nitrogen biocidal compounds commercially available as methylisothiazolinone (MIT), chloromethylisothiazolinone and methylisothiazolinone blend (CMIT/MIT, Kathon grade), octylisothiazolinone (OIT), and dichlorooctylisothiazolinone (DCOIT), each offering a distinct spectrum of biocidal efficacy, solubility, and regulatory approval profile for different application environments. Production involves multi-step organic synthesis from specialty sulphur-containing precursors under controlled conditions, with each grade requiring specific reaction pathways and purification to meet purity specifications for regulated end-use applications. The largest pull comes from paint and coatings preservation, where isothiazolinones act as in-can and dry-film preservatives preventing microbial degradation, discolouration, and gas formation in water-based architectural and industrial coatings, subject to regulatory limits under EU Biocidal Products Regulation and equivalent frameworks. Industrial water treatment biocide applications for cooling water, paper mill process water, and oilfield injection water, personal care preservative use, and wood protection formulations consume further volumes. Regulatory restrictions on MIT concentrations in consumer products, specialty precursor costs, and paints sector demand all feed into the price.
Isothiazolinone Price Forecast for 2026
The balance of supply and demand for Isothiazolinones through H2 2026 leans moderately firm. Recovering paint and coatings sector biocide procurement maintained buying. Specialty chemical precursor cost firming supported the production floor. Regulatory transition to OIT and DCOIT grades from MIT in consumer products added portfolio shift buying from formulators.
The main upside risk is a specialty precursor cost spike or tighter OIT and DCOIT supply from regulatory-driven demand migration above the forecast range. The main downside risk is a weaker-than-expected recovery in architectural coatings demand or further MIT concentration limit reductions softening in-can preservative procurement volumes.
| Region | 2026 Price Range (USD/KG) | Outlook |
| Global Average | 3.04 - 3.42 | Paint biocide demand and precursor cost support |
| United States | 3.44 - 3.87 | Coatings and water treatment demand firm buying |
| China | 2.37 - 2.67 | Large capacity keeps China most affordable |
| Germany | 4.14 - 4.66 | Regulatory and energy costs maintain premium |
| India | 3.21 - 3.61 | Growing coatings demand supports firm middle |
For the Quarter Ending June 2026
Isothiazolinone Prices Q2 2026:
- United States: USD 3.419/KG
- China: USD 2.360/KG
- Germany: USD 4.121/KG
- India: USD 3.195/KG
Isothiazolinone Prices in the United States
US Isothiazolinone prices averaged USD 3.419/KG in Q2 2026, up 6.0% from USD 3.226/KG in Q1 2026. Recovering architectural coatings and industrial water treatment biocide procurement and firmer specialty precursor costs drove the Q2 gain.
Why did the price of Isothiazolinone change in Q2 2026 in the United States?
Recovering architectural coatings spring season biocide procurement lifted buying. Firmer specialty sulphur precursor costs raised the production floor. Water treatment and personal care sector procurement added further support near USD 3.419/KG.
Isothiazolinone Prices in China
Chinese Isothiazolinone prices averaged USD 2.360/KG in Q2 2026, up 5.9% from USD 2.227/KG in Q1 2026. Recovering domestic paint and coatings biocide demand and firmer specialty precursor costs drove the seasonal Q2 recovery.
Why did the price of Isothiazolinone change in Q2 2026 in China?
Recovering domestic paint and coatings spring season procurement lifted buying. Firmer specialty precursor costs raised the floor. Large Chinese capacity kept the market most affordable near USD 2.360/KG.
Isothiazolinone Prices in Germany
German Isothiazolinone prices averaged USD 4.121/KG in Q2 2026, up 6.0% from USD 3.889/KG in Q1 2026, the highest among tracked markets. Energy-elevated production economics, regulatory compliance costs, and recovering European coatings biocide demand drove the Q2 firming.
Why did the price of Isothiazolinone change in Q2 2026 in Germany?
European architectural coatings spring biocide procurement recovered and lifted buying. Energy and specialty precursor costs maintained elevated production economics. BPR regulatory compliance costs added premium near USD 4.121/KG.
Isothiazolinone Prices in India
Indian Isothiazolinone prices averaged USD 3.195/KG in Q2 2026, up 6.0% from USD 3.015/KG in Q1 2026. Recovering paint sector biocide procurement and firmer specialty precursor import costs drove the Q2 gain from the Q1 recovery level.
Why did the price of Isothiazolinone change in Q2 2026 in India?
Growing paint and coatings sector procurement lifted buying. Firmer specialty precursor import costs raised the production floor. Water treatment biocide demand added further support near USD 3.195/KG.
For the Quarter Ending March 2026
Isothiazolinone Prices Q1 2026:
- United States: USD 3.226/KG
- China: USD 2.227/KG
- Germany: USD 3.889/KG
- India: USD 3.015/KG
Isothiazolinone Prices in the United States
US prices averaged USD 3.226/KG in Q1 2026, up about 2.0% from Q4 2025. Recovering specialty biocide procurement and firming precursor costs extended the Q4 2025 recovery before the Q2 spring coatings season demand surge.
Why did the price of Isothiazolinone change in Q1 2026 in the United States?
Recovering coatings and water treatment biocide procurement maintained buying. Firmer specialty precursor costs raised the production floor. The market firmed to USD 3.226/KG ahead of the Q2 spring coatings season demand.
Isothiazolinone Prices in China
Chinese prices averaged USD 2.227/KG in Q1 2026, up about 2.0% from Q4 2025. Recovering domestic coatings biocide procurement and firmer specialty precursor costs extended the recovery from the Q3 2025 seasonal dip.
Why did the price of Isothiazolinone change in Q1 2026 in China?
Post-holiday coatings sector procurement recovery lifted buying. Firming specialty precursor costs raised the floor. The market continued recovering to USD 2.227/KG from the Q3 2025 dip.
Isothiazolinone Prices in Germany
German prices averaged USD 3.889/KG in Q1 2026, up about 2.0% from Q4 2025. Recovering European coatings biocide procurement and firmer energy and precursor costs extended the two-quarter recovery trend.
Why did the price of Isothiazolinone change in Q1 2026 in Germany?
Recovering European coatings sector biocide procurement maintained buying. Firmer energy and specialty precursor costs raised the production floor. BPR compliance buying added support near USD 3.889/KG.
Isothiazolinone Prices in India
Indian prices averaged USD 3.015/KG in Q1 2026, up about 2.0% from Q4 2025. Growing paint sector biocide procurement and firmer specialty precursor import costs extended the two-quarter recovery from the Q3 2025 dip.
Why did the price of Isothiazolinone change in Q1 2026 in India?
Growing paint and coatings biocide procurement maintained buying. Firmer specialty precursor import costs raised the production floor. Water treatment sector demand added support near USD 3.015/KG.
Quarterly Isothiazolinone Price Trends
Global Isothiazolinone prices dipped in Q3 2025 on seasonal procurement softness, then recovered through Q4 2025, Q1 and Q2 2026. The average moved from USD 2.80/KG in Q2 2025 to USD 2.744/KG in Q3, recovered to USD 2.799/KG in Q4, firmed to USD 2.855/KG in Q1 2026 and USD 3.026/KG in Q2 2026, a net gain of about 8.1% over the window. Paint sector biocide demand seasonality and specialty precursor cost cycles drove the dip-and-recovery pattern followed by the sustained H1 2026 rise.
| Quarter | Price (USD/KG) | QoQ Change | Direction |
| Q2 2026 | 3.026 | +6.0% | ↑ Rising |
| Q1 2026 | 2.855 | +2.0% | ↑ Rising |
| Q4 2025 | 2.799 | +2.0% | ↑ Rising |
| Q3 2025 | 2.744 | -2.0% | ↓ Falling |
| Q2 2025 | 2.800 | - | - Stable |
| Q3 2026 | In Progress | - | - In Progress |
What was Isothiazolinone Price in 2025?
Isothiazolinone prices dipped in Q3 2025 on seasonal procurement softness before recovering in Q4. The global average opened near USD 2.744/KG in Q1 2025, dipped to USD 2.744/KG in Q3, and recovered to USD 2.799/KG by Q4, with limited net movement. Paint sector biocide procurement seasonality and specialty precursor cost cycles governed the price pattern through the year.
Isothiazolinone Prices in the United States in 2025
US prices held near USD 3.099-3.163/KG through 2025, tracking paint sector biocide procurement cycles and specialty precursor costs with a seasonal Q3 dip and Q4 recovery.
Isothiazolinone Prices in China in 2025
Chinese prices held near USD 2.140-2.184/KG through 2025. Large domestic capacity and paint sector procurement cycles governed the seasonal pattern with limited full-year net movement.
Isothiazolinone Prices in Germany in 2025
German prices held near USD 3.736-3.813/KG through 2025. Elevated energy and regulatory compliance costs maintained the European premium across paint and water treatment biocide procurement cycles.
Isothiazolinone Prices in India in 2025
Indian prices held near USD 2.909-2.970/KG through 2025. Growing paint and coatings sector demand and specialty precursor import cost cycles governed the seasonal pattern with limited movement.
How We Can Help
Expert Market Research: Your Source for Real-Time Isothiazolinone Price Intelligence
Expert Market Research tracks Isothiazolinone prices continuously across every major producing and consuming region. The team traces causation through specialty precursor economics, paint and coatings sector biocide procurement cycles, water treatment demand, and regulatory BPR compliance requirements. Contact Expert Market Research today for Isothiazolinone pricing data, bespoke market analysis, and strategic procurement advisory.
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Key Questions Answered in the Report
Paint and coatings preservation takes the largest share globally. Isothiazolinones act as in-can and dry-film preservatives in water-based architectural and industrial coatings. Industrial water treatment biocide applications for cooling water and process water, personal care preservative use, and wood protection formulations also consume significant volumes.
The Q2 2026 average was USD 3.419/KG in the United States, USD 2.360/KG in China, USD 4.121/KG in Germany, and USD 3.195/KG in India. Germany carries the highest cost due to energy, regulatory compliance, and specialty precursor input premiums.
The global average rose from USD 2.855/KG in Q1 to USD 3.026/KG in Q2, a gain of about 6.0%. Recovering paint and coatings spring biocide procurement and firmer specialty precursor costs drove the consistent H1 2026 upward trend.
Seasonal procurement softness in paint and coatings biocide applications eased buying urgency after the spring peak. Buyers drew down contracted inventory before Q4 restocking, softening the market to USD 2.744/KG before the Q4 recovery.
The global average is expected in the USD 3.04 to 3.42/KG range for H2 2026, with support from paint biocide demand continuity, water treatment procurement, and specialty precursor cost firming across Asian and European producing markets.
Germany holds the highest cost on energy, regulatory compliance, and specialty precursor input premiums. The United States and India hold a firm middle, and China prices lowest on large domestic production capacity and lower input costs.
This report is updated monthly. For real-time pricing intelligence, contact the Expert Market Research team directly.
Prices respond mainly to specialty sulphur-nitrogen precursor costs, paint and coatings sector biocide procurement seasonality, regulatory MIT and CMIT concentration limit changes in consumer products, and demand migration between isothiazolinone grades.
China holds the largest production capacity, followed by European producers and India. Any specialty precursor cost shift or regulatory demand change ripples across all regional grades and markets.
Buyers can use quarterly trends and forecasts to time biocide contracts around paint sector spring procurement peaks, monitor specialty precursor costs as the primary production floor signal, and track BPR regulatory updates for MIT and CMIT grade demand migration as a secondary price driver.
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