Market overview

4-Methoxyphenol (MEHQ, CAS 150-76-5) is the standard polymerisation inhibitor for acrylic acid, acrylate and methacrylate monomers, typically dosed in the tens to hundreds of ppm to keep monomers stable in storage and transport. It is also used as an antioxidant and UV stabiliser intermediate and, as mequinol, in dermatology. Because it is co-produced with hydroquinone and catechol from phenol, its supply is shaped by a handful of integrated diphenol producers.

The question this report answers
How tightly is MEHQ demand linked to acrylic monomer output, and who supplies the inhibitor market?

Market Krystal preliminary estimate (2025)
Fact.MR values MEHQ at USD 469.2 mn (2024). A bottom-up check (inhibitor loading across acrylic monomer output) suggests a lower figure; we use USD 300-500 mn. Confidence grade B: one published estimate, checked against volumes or prices.

Market dynamics
– Demand: polymerisation inhibitor for acrylic acid, acrylates and methacrylates; also cosmetics and pharma
– Supply: Solvay (Syensqo), Eastman, Camlin Fine Sciences and Chinese producers
– Price and margin: hydroquinone and phenol costs drive price
– Regulation: depigmenting use in cosmetics restricted in the EU

Key figures at a glance (third-party, cited)
– MEHQ market: USD 469.2 mn (2024) to USD 774.2 mn by 2034 at 5.1% CAGR (Fact.MR)
– East Asia holds 32.7% of 2024 demand; North America USD 142.2 mn (Fact.MR)
– Demand is driven by acrylic monomer production, the dominant end use for inhibitors

Recent developments among key stakeholders
– Dec 2025: Clean Science and Technology (India) started commercial production of hydroquinone and catechol (10,000 t/yr combined) and expects to cross-sell to its existing MEHQ customers (HDFC Sky research note, Feb 2026)

What this means for the market
India is building an integrated diphenol chain that competes directly with Chinese and European MEHQ supply. The report quantifies the effect on trade flows and price.

How published estimates compare
Fact.MR’s segmentation does not isolate acrylic-monomer inhibition, which is the core driver. Market Krystal links MEHQ demand directly to acrylic acid, acrylate and methacrylate production by region and to dosing levels, and benchmarks it against hydroquinone and catechol co-production economics.

Strategic scenarios to 2047
– Base: demand follows GDP, construction and population; China and the Middle East add capacity while Europe rationalises on energy costs.
– Constrained supply: energy shocks, carbon prices and closures in Europe tighten regional supply and widen price spreads between regions.
– Technology transition: low-carbon routes (green hydrogen, electrified crackers, bio-feedstocks, CO2 capture) change cost curves and favour early movers.
The swing factor for 4-Methoxyphenol (MEHQ) is acrylic monomer output and inhibitor loading. Signposts: European closure announcements, EU CBAM scope, Chinese capacity additions, energy prices.

What this report delivers
Annual volume (tonnes) and value (USD) for 2026-2035, segmented by application: monomer inhibitor (acrylic acid, acrylates, methacrylates, styrene), antioxidants, pharmaceuticals and cosmetics, agrochemicals; region: China, Europe, North America, India, Japan, South Korea. Each segment is backed by a producer capacity table, price benchmarks for 2020-2025 by grade and region, trade-flow analysis and a supplier risk map. Companies assessed include Solvay, Camlin Fine Sciences, Eastman, Clean Science and Technology, Ube Corporation, Chinese diphenol producers. The 2036-2047 outlook uses three explicit scenarios (base, constrained supply and technology transition) rather than a single extrapolated curve.

Who uses this report
Acrylic monomer producers, inhibitor suppliers and chemical investors.

Why our approach is evidence-based
Most CAS-level market listings publish a single number with no audit trail, and we regularly find figures that contradict their own growth rates or exceed the size of the market they sit inside. Market Krystal works the other way round. We start from physical evidence: plant capacities, production and trade data, company disclosures, regulatory texts and price records. We build volume and price separately and only then compute value. Every third-party figure is cited, every Market Krystal estimate is labelled with its method and a confidence grade, and conflicts between sources are shown rather than hidden. Confidence grades: A = two or more independent sources agree, or government or company data; B = one published estimate checked against volumes or prices; C = no reliable published figure, so the range is built from stated assumptions and narrowed in the full report.

Methodology and delivery
Prepared by the Market Krystal Chemicals Research Team. Each report is built around the buyer’s question: after purchase, a short scope confirmation fixes the priority regions, companies and applications, and the report is delivered within 5-7 business days with the Excel model behind every estimate, so buyers can audit and change the assumptions.

The purchased delivery includes the PDF report, Excel datasets and customization around the buyer’s priority region, company set, application or commercial question.

What this research answers

The study connects production routes, named suppliers, applications, regional demand, trade, pricing drivers and commercial opportunities for this CAS number. Detailed estimates and company analysis remain inside the purchased report.