PBTC-4Na Metal Chelating Agents for Water Treatment with Good Synergy in Compounding and Improved Solubility of Zinc
PBTC-4Na Metal Chelating Agents for Water Treatment with Good Synergy in Compounding and Improved Solubility of Zinc
Basic Information
Model Number : HMHT0141
Other Names : PBTC-4Na
Molecular Weight : 270
CAS NO. : 40372-66-5
EINECS NO. : 254-894-4
Physicochemical Properties
PBTCA•Na₄ is a low-phosphorus-content scale and corrosion inhibitor. Thanks to its molecular structure containing both phosphonic acid and carboxylic acid groups, it demonstrates excellent performance, particularly in high-temperature environments. Compared to conventional organic phosphonates, it offers superior scale inhibition efficiency.
This product also enhances the solubility of zinc ions, provides strong resistance to oxidative degradation by chlorine, and exhibits excellent synergistic effects when formulated with other agents. However, as a solid, it is hygroscopic and should be stored with care.
Technical Specifications:
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Appearance: White solid powder
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Active Content (as PBTCA): 67.0–73.0%
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Active Content (as PBTCA•Na₄): 88.8–96.8%
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Total Phosphorus (as PO₄³⁻): 23.5–25.5%
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Iron Content (as Fe³⁺): ≤35 ppm
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pH (1% aqueous solution): 6.5–8.0
Technical Specifications
| Density | 1.045g/cm3 |
| Boiling point | 368.9°C at 760 mmHg |
| Flash point | 158.2°C |
| Vapor pressure | 1.23E-05mmHg at 25°C |
| Refractive index | 1.455 |
Packaging Types
We can provide 25kg bag or as per customers' requirements.
Applications

PBTCA•Na₄ is one of the most commonly used components in the formulation of high-performance scale and corrosion inhibitors. Recognized for its exceptional effectiveness, it also serves as an excellent stabilizer for zinc salts.
This product is extensively applied in circulating cooling water systems and oilfield water injection systems for its outstanding scale and corrosion control. It is particularly well-suited for formulations containing zinc salts and copolymers, and performs reliably under demanding conditions such as high temperature, high hardness, strong alkalinity, and high concentration environments.
In addition to its use in industrial water treatment, PBTCA•Na₄ functions effectively as a chelating agent and metal cleaner in the cleaning industry. It is typically used in combination with other water treatment additives, including zinc salts, copolymers, organophosphorus compounds, and azoles, to achieve synergistic results.
Storage/Transport Information
Storage: Store in a cool, dry place and must be refastened after opening.
Only trained personnel may be allowed to enter the storage area.
Company Profile

Wuxi High Mountain Hi-tech Development Co., Ltd is a professional industrial company engaged in special
chemical production, technology research & development, and import & export. The company focuses on
the production, trade, and research & development of various chemical products.
Since its establishment, the company has been concentrating on constructing an international marketing
network and optimizing supply chain management, where we have established a long-term strategic
cooperation relationship with numerous large enterprises at home and abroad. Relying on our wide business
channels and professional experience, we are more skillfully providing products of stable but differentiated
quality, along with flexible, highly efficient & considerate service to satisfy our partner at more competitive pricing.
Efficiently treating our customers as partners with sincerity, specialization and satisfaction is our managerial
principle. Attributed to the backup of a dedicated technical team, filled with wide and profound knowledge
and practice in chemicals and world trade for 20 years, the company owns rich experience in product quality
control, technical solution, chemical logistics organization, packaging optimization, port operation, etc., which
accounts for its first-class cost control management and ensures to maintain the overwhelming competitive
advantage over others. In line with the principle of sharing the preferential cost and joint development, the
company has formed an interesting community for years with its customers at home and abroad. Sincerely
to build up a pleasant mutual trust, cooperative, win-win, and value-added sustainable partnership is what
we are achieving to grow together with you!
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,ISO9001 CAS 40372-66-5
,low phosphorus content PBTC-4Na
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