Sustainable Water Management

Currently, water-related risks have intensified due to climate change and the increasing demand for water driven by population growth and industrial development. The company recognizes the potential impacts of these risks on its business operations, including risks related to water quantity and quality, regulatory changes and pricing structures, as well as stakeholder conflicts arising from water usage. In response, the company is committed to implementing appropriate preventive and mitigation measures aligned with Sustainable Development Goal 6 (SDG 6) and Thailand’s 20-Year Water Resource Management Master Plan

Management Guidelines

Water management using the

3Rs

principle (Reduce, Reuse and Recycle)
Promote invention and improvement
to reduce water consumption in each process with
Kaizen and QCC
activities
Join and build partnerships with external agencies
to maintain water resources.
Consider the quality and quantity of water used to ensure
it does not affect the communities surrounding the factory
icon water management
Expand water management into the supply chain by promoting
cooperation and water conservation with partners through the Business Code of Conduct

Water Resource Risk Management

The Company has analyzed the situation of water sufficiency (water-stressed areas) in all factory areas annually using the Aqueduct Water Risk Atlas tool of the World Resources Institute (WRI). In 2025, the results of the risk assessment found that 15.00 percent of the production areas were in areas with extremely high of water stress, while 7.00 percent of the operational areas were at high risk level of water stress.

The use of the Aqueduct Water Risk Atlas tool to assess water stress risks in the company’s production areas

The proportion of areas at risk of water stress.

(The details can be found in the 2025 Sustainability Report under the section on Sustainable Water Management)

Goal

Reduce new water withdrawals from water sources per product unit by
20%
compared to the base year 2022 by 2026.

Performance

In 2025, the Company’s total water consumption was 22,378,399 cubic meters, of which 21,042,128 cubic meters were treated water (recycled water) reused, accounting for 94.03% of the total water consumption.
Indicators Unit 2022
(Base year)		 2023 2024 2025
New water withdrawals from water sources per product unit
(surface water, ground water, tap water)		 cubic meters per ton of product 1.62 1.46 1.11 1.08
Percentage of water withdrawal intensity reduction compared to base year Percent 46.00 9.87 31.48 33.33

Wastewater Management

The Company is aware of the potential impact of wastewater drainage on the environment and biodiversity of the communities surrounding the factory. The Company has installed a wastewater treatment system that complies with standards to control the efficiency of wastewater treatment and the quality of wastewater discharge meets legal requirements.

Management Guidelines

Always inspect and control the wastewater treatment system
to maintain its efficiency.
Develop a wastewater treatment system
for optimal efficiency
and maximum water reuse.
Apply technology and innovation
for inspecting and controlling wastewater treatment systems.

There are 2 types of treatment systems used as follows:

1. Aerated Lagoon

is a wastewater treatment system that uses oxygen from an aerator to increase the amount of oxygen in the water to a sufficient amount for microorganisms to accelerate decomposition of organic substances in wastewater faster than if they were allowed to decompose naturally. This system will be used in factories in the southern region.

2. Activated Sludge

wastewater treatment system is a system that uses aerobic bacteria as the main agents in decomposing organic matter in wastewater in the form of carbon dioxide and water. The treated wastewater flows to a sedimentation tank to separate the sludge from the clear water. The excess sludge will be disposed of further and the clear water in the upper part will be wastewater that can be drained into the environment. This system will be used at factories in the Northeast.

Maturation Pond

Additionally, wastewater from the concentrated latex plant, including Trang, Suratthani, and Kanchanadit branches, is equipped with the BOD online system. This system measures the amount of Biochemical Oxygen Demand (BOD) in treated wastewater and sends real-time BOD measurements to the Department of Industrial Works, to ensure that the wastewater discharged into public water bodies meets legal requirements.

Goal

The block rubber factory is able to reuse
100%
of the treated water.

Performance

The block rubber factory

has developed and improved the wastewater treatment process to achieve maximum efficiency and minimize odor impact, by constructing an emergency pond to contain serum water from cup lump rubber before it enters the wastewater treatment process. The block rubber factory can recycle the water after the treatment process and reuse it in all production 100% without having to discharge water outside the factory.

Concentrated latex factory

with effluent discharge that has passed the water quality treatment process and comply with the effluent quality standards prescribed by law. In 2025 there were no incidents of non-compliance with the laws related to the quality and volume of effluent discharge outside the factory that significantly impacted the company’s operations.

In 2025, the company had no incidents of non-compliance with regulations related to the quality and quantity of wastewater discharged outside the factory.

(Specific information for STA-TG, STA-KD, and STA-SR branches that have effluent discharge outside the factory)
The quality of effluent discharged from the factory 2022 2023 2024 2025 Standards*
BOD (mg/l) 6.8 6.5 5.2 3.6 20
COD (mg/l) 66.6 54.0 54.0 48.2 120
SS (mg/l) 10.3 15.3 26.2 15.8 50
pH 7.2 7.7 7.7 7.8 9.0
TDS (mg/l) 1,603.0 1416.7 989.5 751.7 3,000
Oil & Grease (mg/l) 1.0 1.0 3.7 1.0 5.0

Note: *Based on the 2017 Factory Wastewater Discharge Standards issued by Thailand’s Department of Industrial Works (DIW).