How is ethylene glycol classified based on aldehyde content?
2026-02-26
In the chemical industry, Ethylene Glycol can also be graded based on the content of aldehydes. Low aldehyde content (typically < 10 mg/kg) is suitable for polyester fiber production requiring high color stability and product appearance; 10–50 mg/kg is considered medium grade, while > 50 mg/kg is low grade.
From a color perspective, grades are determined using the Pt-Co color scale:
Ethylene Glycol Premium Grade: ≤ 5 Hazen units
Medium Grade: 5–15 Hazen units
Low Grade: > 15 Hazen units (may affect performance in appearance-sensitive applications)
Iron content is another key indicator of purity and equipment corrosion risk:
Ethylene Glycol High Grade: < 0.1 mg/kg
Medium Grade: 0.1–1 mg/kg
Low Grade: > 1 mg/kg (may accelerate equipment corrosion)
Ethylene Glycol Density at 20°C is also used for grading:
Premium Grade: 1.113–1.115 g/cm³
Ethylene Glycol First Grade: 1.112–1.116 g/cm³
Qualified Grade: 1.111–1.117 g/cm³
From a color perspective, grades are determined using the Pt-Co color scale:
Ethylene Glycol Premium Grade: ≤ 5 Hazen units
Medium Grade: 5–15 Hazen units
Low Grade: > 15 Hazen units (may affect performance in appearance-sensitive applications)
Iron content is another key indicator of purity and equipment corrosion risk:
Ethylene Glycol High Grade: < 0.1 mg/kg
Medium Grade: 0.1–1 mg/kg
Low Grade: > 1 mg/kg (may accelerate equipment corrosion)
Ethylene Glycol Density at 20°C is also used for grading:
Premium Grade: 1.113–1.115 g/cm³
Ethylene Glycol First Grade: 1.112–1.116 g/cm³
Qualified Grade: 1.111–1.117 g/cm³
Zibo Anhao Chemical Co., Ltd. is a professional manufacturer and supplier of high-quality ethylene glycol (EG), with rich experience in the chemical industry. Our ethylene glycol products are produced using advanced production processes and strict quality control systems, ensuring compliance with national standard GB/T 4649-2018 for premium, first-class, and qualified grades. With excellent properties such as low volatility, low corrosion, and complete miscibility with water and organic solvents, our EG is widely used in polyester fiber production, antifreeze solutions, solvents, and industrial chemical manufacturing.
Backed by our own production facilities and stable supply chain, we provide reliable, consistent products and customized solutions to global clients. As a trusted partner in the chemical sector, Zibo Anhao Chemical is committed to delivering top-tier ethylene glycol and supporting the sustainable development of our customers' businesses worldwide.
Backed by our own production facilities and stable supply chain, we provide reliable, consistent products and customized solutions to global clients. As a trusted partner in the chemical sector, Zibo Anhao Chemical is committed to delivering top-tier ethylene glycol and supporting the sustainable development of our customers' businesses worldwide.