Brand Story


Chongqing Tonghui Gas Co., Ltd., founded in 2007, is a leading specialty gas manufacturer in Southwest China. The company specializes in researching, producing, and selling food-grade and electronic-grade Carbon Dioxide, Nitrous Oxide, and other electronic-grade specialty gases.

Over the years, Tonghui has dedicated itself to praoduct innovation and increasing output. In 2022, we launched the new brand ROTASS, concentrating on food-grade CO2 and N2O, aiming to meet the rising market demands while optimizing the utilization of our resources.

Tonnes of Carbon Dioxide
Tonnes of Nitrous Oxide
Tonnes of 7N Ammonia
N2O Filling Lines

Our Mission


In every step of the manufacturing to export processes, we invest millions and in maintenance, inspection and innovation to ensure your products well delivered.


We recycle all the waste and unqualified items at every stage of our process to minimize resource consumption.

Value Creation

As a gas supplier, we offer personalized solutions, tailoring gas content, purity, brand, and more cooperative terms to maximize customer satisfaction and deliver value to our target market.

Social Responsibility

We take our social responsibilities seriously by contributing to student loans to support education, aiding underprivileged areas to uplift communities, and sponsoring in social events to promote positive energy.

Delivering Excellence
as A Gas Supplier

Partner With Us

ROTASS Products offer a range of N2O cream chargers in different sizes, CO2 chargers, and various accessory items. Safety is our top priority when dealing with chemicals, so we seek qualified distributors both locally and internationally to cater to the unique demands of our local customers.

As a distributor, you have early access to the best prices and continuous stock, increasing your profit margin and improving turnovers. We offer local delivery for your pallet orders direct from our US and EU warehouses, which allows you to focus on generating sales without the hassle of storage or distribution.

Become Our Partner

Get in touch with us today to discover how we can support your business growth.


We will get back to you within 24 hours


+86 185 8458 8323