Specialty Chemicals

The Foundation Has Always Been Family

Originally set up to serve the textile market in the southeast region of the United States, PHT International, Inc. emerged as a pioneer in delivering solutions from China by Founder and Chairwoman Lihong Yu.


While the company was established in 1993, its inception goes back further.  Lihong was born in Ningbo, China and raised through the Chinese Cultural Revolution in the late 1960’s. As with many who were skilled and educated during this period, her parents were exiled to the countryside during the decade-long revolution; she was just six years old. It was in the food markets of Ningbo, in the care of her grandparents, that Lihong’s tenacity and talent for negotiations emerged.


Yu took on the responsibility of managing the household budget to ensure the entire family could be fed. She sought, purchased, and negotiated her way into stretching their limited income. In the end, her drive and pragmatism became lifelong pillars that eventually gave birth to PHT.

To us YOU matter!

As one of the best full-service CRDMO and chemical supply companies in the industry, PHT designs agile and flexible custom solutions you can count on.  Our incredible success is due to the values we hold true.

Take Advantage of PHT’s Unsurpassed Relationships

In the late 1990’s, Lihong spotted the trend of large chemical companies going directly to China and many set up their own sourcing offices in hubs like Shanghai, Beijing, and Hong Kong that remain to this day. 

As a westernized company with global reach, Lihong focused PHT in agricultural and pharmaceutical chemicals. This quickly turned into plant partnership/ownership options with sourcing, researching, developing, and manufacturing capabilities. 

With passion, innovation, and an unrelenting belief that the right relationships are the key to success, Lihong’s vision for PHT as an integrated CRDMO partner and chemical supplier in the life sciences area continues to strengthen.

History & milestones




Sourced from China and supplied to Europe and the Americas


Partners & JVs

Custom Intermediate & Regulated Markets

In house development with scale up at partner sites. Supplied API’s and AI’s from partners and JV facilities


PHT Manufacturing

API’s & Regulated Intermediates

Purchased Sancus Arc Biochem, a FDA inspected, cGMP facility


Green Chemistry

Key Technology

Exclusive collarborations with UCSB, sponsoring a post-doctorate in
Professor Bruce Lipshutz Green Chemistry Lab


Equity Investment

Intermediates & AI’s

Invested in Insight FineChem to enhance our fine chemical manufacturing capacity and CMO business for our crop protection customers



Contract Research Organization (CRO)

Purchased Basilea Pharmaceutica China to boost our CRO services enhancing out CDMO service for our innovative cuctomers

All 7 Locations Are Here to Serve You!

All 7 Locations Are Here to Serve You!

Meet The Team

Lihong Yu


Mike Rigsbee


Mark Witterholt

Head of BU

Susan Huang

GM of PHT China

Irvin Zhou

GM of PHT Tech

Uwe Steffan

GM of PHT Pharma

Amy Cooper

Global, Head of HR

Dana Vestal

Global, Head of IT, Operations, Project Management & Branding

Meet Our Founder, Lihong Yu

Here’s What People Are Saying About Working With PHT


CPhI Worldwide 2023

October 24th – 26th

Barcelona, Spain

SOCMA Summit 2023

November 6th – 8th
New Orleans, LA, USA

DCAT Week 2024

March 18th – 21st
New York, NY, USA

CPhI North America 2024

May 7th – 9th

Philadelphia, PA, USA

Chemspec Europe 2024

June 19th – 20th
Dusseldorf, Germany

CPhI China 2024

June 19th – 21st

Shanghai, China

Specialty & Agro Chemicals America 2024

June 25th – 27th

Savannah, GA, USA


Agile & Flexible Custom Solutions 
From a Reliable Partner You Can Trust

Agile & Flexible Custom Solutions  From a Reliable Partner You Can

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