About Clean Science and Technology Limited (CSTL)

Clean Science and Technology Limited (CSTL) is a Pune-headquartered specialty chemicals manufacturer incorporated on November 7, 2003. The company develops and produces fine and specialty chemicals using proprietary catalytic processes designed for efficiency and lower environmental impact  . CSTL operates four independent manufacturing units—each designed as a Zero Liquid Discharge (ZLD) facility—with in‑house R&D, pilot capabilities and application testing; its solutions are supplied to 500+ customers in 35+ countries, with exports contributing ~64.8% of revenue in FY25. The company’s positioning is technology-led and sustainability-focused, with established competencies in chemistries such as hydrogenation, esterification, polymerisation, hydroamination and triphasic catalytic ring formation, guided by atom-economy principles .

CSTL’s key portfolio spans:

• Performance Chemicals, including the fully backward-integrated Hindered Amine Light Stabilisers (HALS) series marketed under the ‘Cleanlight Stab’ brand (grades 770, 622, 944, 119 and 783) for polymer stabilization.
• Pharma and Agro Intermediates, such as DHDT, a complex pharmaceutical intermediate, and DCC and Veratrole used in regulated pharma and agro chains.
• FMCG Chemicals, notably 4‑MAP (a UV blocker ingredient for sunscreens) and Anisole (a precursor in perfumes, insect pheromones and pharmaceuticals).

Selected product leadership cited in the report includes: 4‑MAP and Anisole (No. 1 globally), DCC (No. 2 globally), and DHDT (No. 1 in India) within their respective markets or categories noted . CSTL reports that it is gaining recognition across Europe, North America and Asia by combining high‑purity performance with strong regulatory compliance and traceability in manufacturing .

Clean Science and Technology Limited’s Business Segments

CSTL reports three operating verticals and their FY 2024–25 revenue contributions:

• Performance Chemicals: ₹6,134 million (69%)
• Pharma–Agro Intermediaries: ₹1,689 million (19%)
• FMCG Chemicals: ₹1,084 million (12%) .

Industries served include performance materials, pharmaceuticals, agrochemicals and FMCG, reflecting the breadth of applications across polymers, regulated pharma, agriculture and consumer products .

Revenue by geography (FY 2024–25):

• Domestic: ₹3,194 million
• Exports: ₹5,868 million.

The standalone regional split:

India ₹3,193.84 million; China ₹1,991.16 million; America ₹1,583.32 million; Europe ₹1,351.58 million; Rest of the world ₹942.17 million.

Clean Science and Technology Limited Key Management

• Ashok R. Boob, Managing Director
• Krishnakumar R. Boob, Whole‑time Director
• Sanjay Parnerkar, Chief Financial Officer. 

Latest Updates on Clean Science and Technology Limited (CSTL)

FY 2024–25 was a pivotal year marked by new product commercialization and capacity-led scale-up:

• CSTL commercialised the full HALS series (Phase 1), adding an estimated US$1 billion to its total addressable market and positioning the company as the first Indian and fifth global player to be fully backward integrated for HALS
• The company also commercialised DHDT, described as a key pharmaceutical intermediate, broadening its footprint in regulated markets and import substitution opportunities  .
• Clean Fino‑Chem Limited (CFCL)—a wholly‑owned subsidiary and CSTL’s largest facility spanning 34 acres—became fully operational and houses India’s largest HALS manufacturing base; it operates with ZLD processes aligned to the group’s sustainability goals  .
• To accelerate customer qualification, CSTL established its first application laboratory to evaluate HALS performance under real‑use conditions, aimed at speeding up product validation with clients .
• It included the development of the highest-ever number of new products in CSTL’s history, with eight new products reported and record sales volumes in 2024–25.