Sodium Glycolate Storage & Tank Compatibility

Storing Sodium Glycolate? Start Here

Sodium glycolate (C₂H₃NaO₃, CAS 2836-32-0) is the monosodium salt of glycolic acid, the simplest alpha-hydroxy carboxylic acid. It is supplied as a white, hygroscopic crystalline powder that dissolves freely in water to give a mildly alkaline solution, and it is also marketed as a ready-made aqueous concentrate. The compound serves as a buffered, low-odor source of glycolate in cleaning chemistry, leather and textile processing, metal finishing, and personal-care formulations, where it delivers chelating and pH-buffering action without the corrosivity of the free acid. Because it is a non-volatile, non-combustible carboxylate salt, sodium glycolate is straightforward to store in bulk: its solutions are compatible with the polyethylene resins used in modern industrial tanks, while its powder form simply needs protection from moisture pickup and caking.

Is Sodium Glycolate Compatible With Polyethylene (HDPE / XLPE) Tanks?

Yes. Sodium glycolate, like other aqueous sodium salts of organic acids, is fully compatible with high-density polyethylene (HDPE) and cross-linked polyethylene (XLPE) at ambient temperature, earning an S (Satisfactory) rating. Polyethylene is a non-polar polymer that resists aqueous solutions of salts, mild acids, and mild alkalis; the dissolved glycolate anion and sodium cation neither swell nor chemically degrade the resin. This places sodium glycolate solutions in the same compatibility class as sodium acetate, sodium gluconate, and sodium citrate, all of which are routinely stored in poly tanks. The one practical caution is heat: as with all polyethylene service, confirm the operating temperature stays within the tank's rated envelope, since elevated temperature lowers the resin's chemical-resistance margin. The dry powder is chemically inert toward polyethylene but is strongly hygroscopic, so keep powder containers sealed against humidity.

Material compatibility at a glance

Sodium glycolate is the sodium salt of glycolic acid and is normally handled either as a dry, hygroscopic powder or as a mild-alkaline aqueous solution. In solution it behaves like a typical sodium carboxylate salt and does not attack polyethylene, polypropylene, PVC/CPVC, 316 stainless steel, or EPDM, making cross-linked or high-density polyethylene tanks an excellent primary storage choice. Carbon steel and FKM elastomers warrant case-by-case review for sustained wet contact.

Ratings: S suitable · C conditional / limited · U unsuitable. Verify against the cited resistance charts and your concentration/temperature before specifying.

The safety that actually matters

• Wear chemical splash goggles and gloves; the material is classified as causing serious eye damage/irritation (H318/H319) and skin irritation (H315).
• Avoid generating or breathing dust; the powder may cause respiratory irritation (H335). Use local exhaust ventilation when handling dry product.
• Store the powder in tightly closed containers in a cool, dry area; it is hygroscopic and will absorb moisture and cake if left open.
• Keep away from strong acids, which liberate glycolic acid, and from strong oxidizers and excessive heat.
• Provide eyewash and safety-shower access in handling areas; rinse eyes cautiously with water for several minutes if contact occurs.
• Contain spills, collect dry material for disposal, and flush residue with water; dispose of in accordance with local regulations.

Common questions

Can sodium glycolate be stored in a polyethylene tank?

Yes. Aqueous sodium glycolate solutions are compatible with both HDPE and XLPE poly tanks at ambient temperature, rated S (Satisfactory). It behaves like other sodium salts of organic acids and does not attack the resin.

Is sodium glycolate flammable?

No. It is a non-combustible solid carboxylate salt with no flash point and negligible vapor pressure, carrying an NFPA flammability rating of 0.

What are the main handling hazards?

It is classified for skin irritation (H315), serious eye damage/irritation (H318/H319), and respiratory irritation from dust (H335). Use goggles, gloves, and dust controls when handling the powder.

What is the difference between sodium glycolate and glycolic acid for storage?

Sodium glycolate is the neutralized sodium salt, so its solutions are mildly alkaline and far less corrosive than the free acid. This makes it gentler on metals and fully suitable for polyethylene storage.