Diethylene Glycol (DEG) in Paints and Coatings — Chemistry, Mechanism, and Industrial Applications
Diethylene Glycol (DEG) in Paints and Coatings — Solvent, Coalescing Agent & Paint Additive
High-purity diethylene glycol (DEG, CAS 111-46-6) exported from ISO-certified plants in Turkey and our Dubai hub. Boiling point 245°C, fully water-soluble, and hygroscopic. Ideal for water-based coatings, industrial paints, automotive finishes, and printing inks. Shipped in drums, IBCs, and ISO tanks with a Certificate of Analysis on every lot and a firm FOB/CIF quote in 24 hours.
Quick Answer
Diethylene glycol (DEG, CAS 111-46-6) is a high-boiling (245°C) ether-alcohol solvent and coalescing agent widely used in paints and coatings. In water-based coatings, DEG acts as a coalescing agent that temporarily softens latex polymer particles during drying, enabling them to fuse into a continuous film below their Minimum Film Formation Temperature (MFFT). It also functions as a solvent for resins and pigments, a humectant to regulate drying time, and a viscosity modifier to improve flow and leveling. SUHA International supplies industrial-grade DEG (99.5%+) from Turkey and the UAE with a Certificate of Analysis per batch.
- Chemical: DEG (C₄H₁₀O₃)
- CAS: 111-46-6
- Boiling Point: 245°C
- Flash Point: 154°C
- Viscosity: 35.7 mPa·s
- HS Code: 2909.44
- UN No.: 3082
- Appearance: Colourless, hygroscopic liquid
What Is Diethylene Glycol (DEG)? — Chemistry, Properties & Relevance to Coatings
Diethylene glycol (DEG) is a colorless, nearly odorless, hygroscopic liquid produced via the hydration of ethylene oxide. Chemically an ether-alcohol (C₄H₁₀O₃, CAS 111-46-6), DEG occupies the critical middle position between monoethylene glycol (MEG) and triethylene glycol (TEG) in the glycol family. Its high boiling point of 245°C, low volatility, and complete water solubility make it indispensable in modern paint formulation and coating formulations.
Unlike more volatile solvents, DEG's hygroscopic nature and amphiphilic molecular structure allow it to dissolve resins, pigments, and binders effectively while remaining in the wet film long enough to enable proper coalescence. For water-based coatings, DEG prevents premature drying, extends open time, and improves wet-edge retention. For industrial coatings, it provides the solvency power needed for high-build epoxy and polyurethane systems without the volatility that causes solvent popping or pinholing.
Commercially, DEG is available in industrial grades at 99.5% purity or higher. SUHA International supplies coating-grade DEG from dual origins — ISO-certified production facilities in Turkey and our UAE export hub — giving bulk buyers supply-chain redundancy and consistent batch quality. Every shipment includes a Certificate of Analysis (COA) verifying purity, water content, acidity, and color specification.
Chemical Identity & Physical Properties — Diethylene Glycol for Coatings
| Parameter | Data | Notes / Regulatory Ref. |
|---|---|---|
| IUPAC Name | 2,2'-Oxydiethanol | Commonly diethylene glycol |
| Trade Names | DEG · Diethylene glycol solvent · Diglycol | All refer to same compound |
| Chemical Formula | C₄H₁₀O₃ | Mol. weight: 106.12 g/mol |
| CAS Number | 111-46-6 | EINECS: 203-872-2 |
| Available Grades | Industrial grade ≥ 99.5% | COA per production lot |
| Appearance | Colourless, hygroscopic liquid | Odourless or faintly sweet |
| Boiling Point | 245°C (473°F) | At 760 mmHg |
| Freezing Point | -10.5°C (13.1°F) | Won't solidify in winter shipping |
| Flash Point | 154°C (309°F) | Closed cup; safer than many solvents |
| Viscosity at 20°C | 35.7 mPa·s | Ensures even coating application |
| Density at 20°C | 1.118 g/cm³ | — |
| Solubility in Water | Completely miscible | Blends easily in waterborne systems |
| Refractive Index | 1.447 | At 20°C |
| HS Code | 2909.44 | Export classification |
| UN Number | UN 3082 | Environmentally hazardous substance, liquid, n.o.s. |
| Hazard Class | Class 9 (marine pollutant) | IMDG Code for sea transport |
| GHS Pictograms | GHS07 (Exclamation mark) | EU CLP EC 1272/2008 |
| Shelf Life | 24–36 months unopened | Sealed, dry, 15–25°C storage |
How Diethylene Glycol Functions in Paint Formulations — Solvent, Coalescing Agent & Humectant
DEG is not a single-function additive. In paint manufacturing, it simultaneously acts as a solvent, coalescing agent, humectant, and viscosity modifier. Understanding each function helps formulators optimize dosage and select the right grade for water-based coatings, industrial coatings, and automotive finishes.
DEG as a Solvent for Coatings
- High solvency power for polar and semi-polar resins
- Improves pigment dispersion and prevents agglomeration
- Ensures uniform color and opacity without settling
- Compatible with nitrocellulose in printing inks and lacquers
- Blends easily with water and organic solvents
- Reduces viscosity for spray and dip applications
- Typical dosage: 2–5% in waterborne paints
DEG Coalescing Agent
- Temporarily softens latex polymer particles during drying
- Reduces Minimum Film Formation Temperature (MFFT)
- Enables continuous film formation at ambient temperatures
- Critical for waterborne acrylic and vinyl-acrylic latexes
- Prevents cracking, mud-cracking, and poor adhesion
- Improves scrub resistance and durability
- Typical dosage: 2–5% in architectural latex paints
DEG Humectant in Paint
- Absorbs atmospheric moisture to retard surface drying
- Extends open time for large-surface application
- Improves wet-edge retention and reduces lap marks
- Prevents skinning in the can during storage
- Regulates evaporation rate in hot or windy conditions
- Compatible with glycol ether coalescing aids
- Typical dosage: 1–3% as humectant
DEG for Flow & Leveling
- Tunes rheology for optimal flow and leveling
- Reduces brush marks and roller stipple
- Prevents orange peel and sagging in high-build coats
- Maintains viscosity stability during storage
- Improves substrate wetting and adhesion
- Works in both waterborne and solvent-based systems
- Typical dosage: 1–4% for flow modification
DEG Technical Specifications for Coatings — Purity, Color & Physical Properties
Representative analytical data for industrial-grade DEG suitable for paint and coating formulations. A signed Certificate of Analysis for your specific production lot is issued with every shipment. Full TDS PDFs are available before you order — request via the contact form or WhatsApp.
Diethylene Glycol — Technical Data Sheet (Coating Grade)
≥ 99.5% Purity| Parameter | Test Result | Unit | Limit / Notes |
|---|---|---|---|
| DEG Purity | 99.8 | % w/w | Min 99.5 |
| MEG | 0.03 | % w/w | Max 0.05 |
| TEG | 0.02 | % w/w | Max 0.05 |
| Water Content | 0.03 | % w/w | Max 0.05 |
| Acidity | 30 | ppm | Max 50 |
| Ash | Max 30 | ppm | Max 50 |
| Specific Gravity | 1.118 | — | ASTM D-891 |
| Color (Pt-Co) | 5 | — | Max 10 |
| Distillation IBP | 244 | °C | Min 242 |
| Distillation DP | 247 | °C | Max 250 |
| Refractive Index | 1.447 | — | — |
| Viscosity | 35.7 | mPa·s | — |
| Flash Point | 154 | °C | Closed cup |
How Does Diethylene Glycol Work in Paints and Coatings?
DEG's effectiveness in coating formulations stems from its amphiphilic molecular structure — polar hydroxyl groups combined with a non-polar ether linkage. This section explains the mechanism for technical buyers and formulation chemists.
In a typical water-based coating, DEG performs four distinct functions that overlap during the drying cycle. First, as a solvent for coatings, DEG dissolves acrylic, alkyd, epoxy, and polyurethane resins while dispersing pigments and fillers uniformly. Its complete water solubility means it integrates seamlessly into latex emulsions without causing shock or coagulation.
Second, as a coalescing agent, DEG remains in the wet film after water evaporates. Because its boiling point is 245°C — significantly higher than water — DEG lingers long enough to plasticize latex polymer particles, temporarily lowering their glass transition temperature (Tg). This allows the particles to deform and fuse into a continuous, defect-free film even when ambient temperatures are below the polymer's normal MFFT. Without an effective coalescing aid, waterborne paints would form powdery, cracked films in cool or humid conditions.
Third, DEG's hygroscopic nature acts as a natural humectant. By absorbing atmospheric moisture, it slows surface skin formation, extends the wet-edge time, and prevents lap marks on large surfaces. This is particularly valuable in hot, dry climates where rapid water loss causes poor leveling. Finally, DEG modifies viscosity and rheology, improving flow under shear (brushing or rolling) and reducing surface tension defects like orange peel and cratering.
Diethylene Glycol in Paints and Coatings — Sector-by-Sector Applications
DEG's versatility spans architectural, industrial, automotive, and specialty coatings. Below is how each sector uses DEG and the recommended dosage.
Waterborne Architectural Paints
In interior and exterior house paints, DEG stabilizes latex emulsions, reduces MFFT for film formation, and improves scrub resistance. Typical dosage: 2–5%.
DEG for architectural paints →Industrial Protective Coatings
For machinery, pipelines, and marine structures, DEG enhances corrosion resistance and film integrity. Typical dosage: 3–7%.
DEG for industrial coatings →Automotive & Refinish
DEG facilitates high-gloss clear coats by dissolving nitrocellulose and acrylic resins. Typical dosage: 1–4%.
DEG for automotive coatings →Wood Coatings & Furniture
In stains and varnishes, DEG prevents streaking and improves flow into wood grain. Typical dosage: 2–5%.
DEG for wood coatings →Printing Inks & Varnishes
DEG prevents drying-in on the press while maintaining vibrant prints. Typical dosage: 4–8%.
DEG for printing inks →Eco-Friendly & Low-VOC Formulations
DEG helps meet EU Directive 2004/42/EC and EPA Method 24 limits. Typical dosage: 2–4%.
DEG for low-VOC coatings →Coil & Can Coatings
Improves adhesion and flow on treated aluminium and steel. Typical dosage: 1–3%.
DEG for coil coatings →Textile & Leather Coatings
Improves flexibility and dye solubility in printing pastes. Typical dosage: 3–6%.
Full DEG product overview →DEG Packaging, Storage & Shelf Life for Coating Manufacturers
DEG is hygroscopic and must be protected from moisture. SUHA supplies DEG in moisture-resistant packaging with batch ID and shelf-life label.
| Packaging Format | Net Capacity | Material | Ideal For |
|---|---|---|---|
| Steel/HDPE drum | 220 kg | Steel or HDPE | Trial orders, small batches |
| IBC | 1,000 L (~1,120 kg) | HDPE | Mid-scale production |
| Flexitank | 20,000 kg | Single-use flexibag | One-way bulk shipments |
| ISO tank | 20–22 MT | Stainless steel | Full-scale manufacturing |
| Bulk vessel | 1,000+ MT | Chemical tanker | Mega-orders to port terminal |
Shelf life: 24–36 months in original, unopened containers at 15–25°C. Once opened, use within 12 months for critical coating formulations.
Storage: Keep sealed, dry, away from oxidizers and acids. Use stainless steel or lined tanks for bulk. Label clearly to avoid mix-up with MEG or TEG.
Global Logistics for Diethylene Glycol — Export Terms & Routes
SUHA International exports DEG from Turkey and UAE to paint manufacturers worldwide.
| Parameter | Details |
|---|---|
| Loading Ports — Turkey | Mersin · Izmir · Istanbul · Derince · Samsun |
| Loading Ports — UAE | Jebel Ali (Dubai) · Khalifa Port (Abu Dhabi) |
| Incoterms | FOB · CFR · CIF · CPT · DAP · DDP |
| Destination Regions | Europe · Balkans · Middle East · Africa · Asia · Americas |
| Container Types | 20′ FCL · ISO tank · Flexitank |
| MOQ — Packed | 18 MT (one 20′ FCL) |
| MOQ — Bulk | 20 MT (ISO tank) |
| Payment Terms | T/T · L/C at sight · D/P |
| Dangerous Goods | UN 3082, Class 9 marine pollutant |
Diethylene Glycol Price — Market Drivers for Coating-Grade DEG
For a live indicative price or a firm export quote for diethylene glycol in paints and coatings, contact our export desk.
| Price Driver | Direction of Influence | Notes |
|---|---|---|
| Ethylene oxide feedstock | High EO cost → higher DEG price | Primary raw material |
| Energy & electricity costs | High energy → higher DEG price | Energy-intensive production |
| MEG/TEG market balance | Strong MEG demand → lower DEG availability | Co-product economics |
| Purity & specification | Higher purity → premium price | Coating grade requires low water and acidity |
| Freight rates | High freight → higher CIF/CFR price | Container and bulk rates vary by route |
| Volume (MT per order) | Larger volumes → lower unit price | Economies of scale |
| Incoterm | DDP > CIF > CFR > FOB | More service = higher inclusive price |
Get a Firm DEG Quote for Your Coating Formulation — Within 24 Hours
Tell us your application, volume, delivery point, and preferred Incoterm. Our export desk returns a bankable FOB or CIF offer.
Why Source Diethylene Glycol for Your Coatings From SUHA International?
Ordering Diethylene Glycol for Paint Manufacturing — Five Steps
Send Your Inquiry
Specify application, grade, volume, delivery point, packaging, and Incoterm via contact form, WhatsApp, or email.
Receive Firm Export Quote (≤ 24 h)
Written offer with unit price, container value, payment terms, and shipping schedule.
Confirm Order & Terms
MOQ 18 MT packed / 20 MT bulk. Sign proforma invoice; arrange T/T, L/C, or D/P.
QC & Documentation
COA, SDS, full export documents; optional third-party inspection.
Shipment & Delivery
Packed goods 5–10 days, bulk liquid 7–14 days; tracking provided.
Safe Handling of Diethylene Glycol in Paint Manufacturing
Every shipment includes a full SDS/MSDS to GHS/CLP standards. Refer to PubChem and ECHA.
Hazard Classification
GHS07 (Exclamation mark). Harmful if swallowed (LD50 oral rat: 12,500–14,000 mg/kg). Skin irritation (H315), eye irritation (H319). UN 3082 marine pollutant.
Required PPE
Nitrile gloves, splash-proof goggles, chemical-resistant apron, closed-toe shoes. Respirator if heating above 100°C. Emergency eyewash station within 10 seconds.
Storage Requirements
Cool (15–25°C), dry, well-ventilated. Keep sealed. Stainless steel or lined tanks for bulk. Segregate from strong oxidizers and acids.
Regulatory Framework
EU CLP EC 1272/2008; REACH (EC 1907/2006); IMO IMDG Code (UN 3082). SDS available in multiple languages.
FAQ — Diethylene Glycol (DEG) in Paints and Coatings
What is the role of diethylene glycol in water-based paints?
DEG acts as a coalescing agent, lowering the minimum film formation temperature (MFFT) of latex polymers. It also functions as a humectant, solvent, and rheology modifier to ensure smooth, continuous films with improved scrub resistance.
How does DEG lower the MFFT of latex paints?
DEG plasticizes the polymer particles by penetrating their outer layer, reducing the glass transition temperature (Tg). This allows particles to deform and fuse at ambient temperature, forming a cohesive film without cracking.
What is the recommended dosage of DEG in latex paint?
Typical dosage is 2–5% w/w for architectural latex paints. Higher dosages (3–7%) may be used in industrial coatings; always optimize based on resin type and desired film properties.
Is diethylene glycol safe for use in interior paints?
Yes, when properly formulated, DEG is safe. It is classified under GHS07 (irritant), but cured paint films present negligible risk. REACH and CLP regulations require appropriate labeling and SDS.
What are the alternatives to DEG in paint formulations?
Alternatives include Texanol ester alcohol, propylene glycol ethers, and other coalescing agents. However, DEG often provides the best cost-performance balance for waterborne systems due to its high boiling point and low odor.
How does DEG affect paint drying time and open time?
DEG extends open time by absorbing atmospheric moisture and slowing water evaporation. This prevents lap marks and allows better leveling, especially in hot or windy conditions.
Can diethylene glycol be used in polyurethane coatings?
Yes, DEG is compatible with many polyurethane systems as a solvent or coalescing aid. It improves flow and prevents solvent popping due to its high boiling point (245°C).
What is the difference between DEG and propylene glycol in paints?
Propylene glycol (PG) is more volatile and less efficient as a coalescing agent. DEG (245°C) provides longer wet-edge retention and better film formation in demanding coating applications.
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