Liquid Caustic Soda

Liquid Caustic Soda

This substance is found in our everyday life, in different products and applications.
Liquid Caustic Soda

Liquid Caustic Soda

Sodium Hydroxide, known as Caustic Soda, is essential in industry, especially in the production of chlorine and alkali by electrolysis. Its applications include papermaking, detergents and cleaning products, as well as being used in water and food treatment processes. It is also present in everyday life, in cleaning products and in the food industry.


Unipar's seals of excellence

ISO 9001
ISO 9001
ISO 9001 Certification ensures the efficiency of different integrated processes, aimed at customer satisfaction.
ISO 14001
ISO 14001
Ensures compliance with environmental laws, identification, control and reduction of environmental impacts
ISO 45001
ISO 45001
Ensures compliance with occupational health and safety legislation and seeks to minimize hazards in order to protect people.
Manufacturing Process

Manufacturing Process

The manufacturing of this product at Unipar takes place in the Cubatão and Bahía Blanca plants. In Brazil, commercial Liquid Caustic Soda is produced in a type of electrolytic cell where brine flows from one compartment to the other through porous layer (diaphragm). In Argentina, there are two electrolysis cell units: one using the mercury cathode technology (Rayon liquid soda) and the other one using the electrolyzer technology with a two-pole membrane (Membrane liquid soda).

Where is Liquid Caustic Soda used in our daily lives?

Where is Liquid Caustic Soda used in our daily lives?

Given its alkaline properties (a chemical opposite of the acids), it plays an important role in pH neutralization and adjustment in several segments, including the regeneration of ion-exchange resins. Among its major applications, it is used for paper and pulp clarification, and also widely used in the chemical and petrochemical industry, in metallurgy (production of alumina for the aluminum industry), soap and detergent, the textile industry (mercerization) and food processing.

Technical information

Chemical formula NaOH
Molecular weight 40
Fusion point 12-15 ºC
Steam pressure 13 mmHg at 60°C (Information regarding 50% NaOH solution by weight)
Specific weight (Density) 1.52 g/cm³- 1.5506 g/cm³ at 15.5°C (the range is equivalent to a total alkalinity concentration between 49% and 51% NaOH)
pH 14.0 (0.5% solution)

*Non-flammable and non-combustible

* Complete Solubility in Water


Production methods with environmental awareness

Sustainability is in Unipar's DNA in several aspects of our company, generating impact and enhancing financial return.
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Production methods with environmental awareness

Answers by Unipar

Frequently asked questions

What does Unipar do?

Unipar is a leading company in the production of chlorine and soda, and the second in the production of PVC in South America. It is one of the major suppliers of for sanitation and civil construction, also supplying inputs for the paper and pulp, cleaning, aluminum, textile, toy making, and pharmaceutical industries, among others.

What are the products offered by Unipar?

Different products used in our daily lives are developed from raw materials at Unipar. Always acting to defend the environment, we manufacture chemical products such as chlorine compounds and caustic soda, which are essential for the in the sanitation, textiles, and food industries, among others. Vinyl polychloride (PVC), on the on the other hand, is one of the most commonly used plastic materials in the world, by different industries, directly influencing our quality of life and contributing to a more sustainable future. Learn about the product catalog.

How do I register a social project at Unipar?

It's easy. Unipar supports entities that transform the life of communities based on positive initiatives. Every year, Unipar publishes public biddings that guide the registration of social projects. Learn about the regulations of the previous bidding notices by clicking here or register your initiative here.

How can I safely blow the whistle at the company?

Unipar works in an ethical and responsible manner in all its relationships. If you identify something that is irregular, you are safe to report it using our Hotline. We ensure your anonymity, confidentiality and our impartiality, by means of outsourced companies in charge of managing such cases.

Is there a possibility to make a visit to one of Unipar's plants?

Yes, there is. Through our Open Plant program, it is possible to visit Unipar's plants both in Brazil and in Argentina. To schedule a visit free of charge, read the required guidelines.Yes, there is. Through our Open Plant program, it is possible to visit Unipar's plants both in Brazil and in Argentina. To schedule a visit free of charge, read the required guidelines.

What is Unipar's commitment with the environment?

Our purpose is to be agents of transformation for a more sustainable world. We set forth three prerequisites for our actions: they must have a relevant impact, be aligned with our business strategy, and ensure financial return. Learn about our values.

What are the press relations contacts in Brazil and Argentina?

Journalists wishing to obtain more information about Unipar may contact the press relations group in Brazil and in Argentina. The contacts are:



FSB Comunicação


Email: unipar@fsb.com.br

Phone: +55 (11) 3165-9596



LLYC Llorente y Cuenca


Email: labal@llorenteycuenca.com

Phone: +54 (11) 5556 0700.

I’m a professional. How can I submit my CV to the company?

Unipar engages people who create chemistry. We have 1400 employees engaged with the sole purpose of being reliable in all our relationships. To participate in our recruitment processes, please type your email address in the "Join us" area to begin a relationship with the company. You will then be forwarded to the following steps.

I’m a student. What is the procedure to register for an internship at Unipar?

At Unipar, we build a healthy working environment, a space for our employees' professional and personal growth. For students, Unipar develops the Unipar Internship Program. It offers excellent opportunities for engaged, committed students to learn and grow. Expand your horizon in a company like Unipar, and make a difference.

How can I acquire Unipar's products? 47

It's easy. Contact us by registering an email address and a password. From that point on, the path to be a Unipar client begins.