ℹ E-Series Propionate - Technical Positioning vs EGEA (The PGMP/PGMEA Analogy in the E-Series) EGEPR:EGEA is structurally the same relationship as PGMP:PGMEA - propanoate ester vs acetate ester on the same glycol ether backbone. The additional methylene in the propanoate group delivers: (1) bp +~12°C (~169°C vs ~157°C average); (2) evaporation –20–25%; (3) water miscibility drops from 100% (EGEA) to ~2% (EGEPR) - the most important technical differentiator; (4) higher solvency for non-polar polymer segments (lower Hansen δp); (5) acidity expressed as propionic acid (not acetic acid). In markets where EGEA is in compliant use, EGEPR provides the slow-drying, oil-phase-selective E-series alternative for applications requiring maximum leveling time and moisture-independent film formation.

⚠ Regulatory verification required: Because EGEPR contains the 2-ethoxyethyl backbone of EGEE (Repr. 1B) and EGEA (Repr. 1B), and releases EGEE on in vivo hydrolysis, buyers must verify EGEPR's current EU CLP classification status via the ECHA substance page (CAS 14272-48-1) ↗ before any EU-market product incorporation. Sinolook provides a current CLP-compliant SDS with every shipment. For new EU product development, evaluate PGMP (CAS 148462-57-1) - the confirmed non-Repr. P-series propionate - as the regulatory-secure alternative. Sinolook supplies PGMP and can provide comparative technical data.

Three Key Specification Notes (1) Acidity as propionic acid: EGEPR's acidity is correctly expressed as propionic acid (MW 74.08 g/mol) - the actual hydrolysis product of the propanoate ester linkage. Suppliers applying the EGEA (acetic acid) test template without correction understate actual acidity by ~19%. Sinolook uses the technically correct reference acid.  |   (2) Color ≤15 Pt-Co: EGEPR's color specification is ≤15 Pt-Co - slightly wider than the ≤10 standard applied to EGEA and most other products in this series, reflecting specialty production scale realities for a lower-volume ester. Acceptable for all industrial coating, ink, and cleaning applications. Specify ≤10 at time of order for quality-sensitive applications; Sinolook will confirm availability.  |   (3) Flash point boundary: At ~60–65°C, EGEPR sits at the GHS flammable/combustible liquid boundary (60°C threshold). Handle as flammable liquid in all storage and processing until the current SDS classification is confirmed.

Specification Item	Standard / Value	Test Method / Significance
Appearance	Colorless transparent liquid	Visual; no haze or particulate contamination; mild ester odour
Purity (GC)	≥ 99.0%	GC area normalization; ensures batch-to-batch consistency in evaporation rate and solvency
Water Content	≤ 0.05%	Karl Fischer; especially critical for EGEPR - low water miscibility means even small water contamination can cause phase separation in sensitive oil-phase applications
Acidity (as propionic acid)	≤ 0.02%	Potentiometric titration - expressed as propionic acid (MW 74.08 g/mol), the correct hydrolysis product of propanoate ester; NOT acetic acid
Density (d20)	~0.968–0.973 g/cm³	Digital density meter; similar to EGEA (0.973); identity and batch consistency verification
Boiling Point	~168–170 °C	Highest boiling commercial E-series ethyl glycol ether ester; governs ultra-slow evaporation rate
Flash Point	~60–65 °C (closed cup)	At flammable/combustible GHS boundary (60°C threshold); treat as flammable liquid per current SDS until confirmed
Water Miscibility	~2% at 20°C (limited)	Vs 100% (EGEA); key technical differentiator - oil-phase selective; anti-blush in NC lacquers; prevents moisture absorption in can coating
Refractive Index	~1.407–1.412 (n20/D)	Refractometer; identity confirmation
Viscosity (20°C)	~1.6 mPa·s	Slightly higher than EGEA (~1.3 mPa·s); low for easy blending at ambient temperature
Color (Pt-Co)	≤ 15 (wider than EGEA's ≤10; specialty grade)	Colorimeter; acceptable for all industrial applications; contact Sinolook to specify ≤10 for color-sensitive needs
Packaging	200 kg iron drum  /  1000 kg IBC tank	Full export documentation including current CLP-compliant SDS and REACH status letter

EGEPR's boiling point of ~168–170°C is approximately 10–14°C higher than PGMP (~160–163°C) and 12–16°C higher than EGEA (~154–160°C) - making it the highest-boiling commercially traded E-series ethyl glycol ether ester and one of the slowest-evaporating ester solvents in the mid-boiling range used in automotive coatings. In automotive OEM clearcoat and basecoat systems applied on high-speed robotic spray lines where flash-off time before oven entry is constrained by line speed, EGEPR's ultra-slow evaporation provides the maximum possible leveling window at a given production throughput - decisive when PGMP's ~162°C boiling point is still insufficient for a particularly demanding complex-geometry panel or extreme line speed.

In automotive refinishing 'slow hardener' grade 2K PU clearcoats formulated for cold ambient conditions (below 15°C) or without heated spray booth infrastructure, EGEPR's very slow evaporation maintains a workable wet film open time - preventing premature surface gelation that locks in spray texture on large panels. Its limited water miscibility additionally prevents moisture absorption into the wet film in cold, humid body shop conditions where condensation risk is highest.

Can coating is one of EGEPR's most technically differentiated applications. Interior epoxy-phenolic and organosol coatings for food and beverage cans, and exterior alkyd and polyester coatings for aerosol and aluminium beverage cans, are applied by roller coat at 100–500 m/min and thermally cured at peak metal temperatures of 200–260°C in 10–60 second tunnel oven bake profiles. EGEPR's high boiling point (~169°C) ensures mobile, leveling wet film through the initial high-temperature flash-off phase - allowing full film leveling and degassing (release of entrapped gas bubbles) before gel temperature is reached.

Critically, EGEPR's ~2% water miscibility minimises atmospheric moisture absorption during the brief period between roller coat application and oven entry - preventing blush (haze) defects in clear or lightly pigmented can lacquer films caused by moisture condensation in EGEA-formulated equivalents under humid production environments. This combination makes EGEPR a technically superior specialty ester for high-speed can and coil coating lines where both leveling performance and humidity robustness are production requirements.

In nitrocellulose lacquer systems for wood furniture, EGEPR's limited water miscibility (~2%) provides a double anti-blush mechanism in high-humidity production environments (tropical climates, poorly climate-controlled spray booths): first, slow evaporation extends the film's workable window and reduces the temperature differential between wet film and ambient air that drives moisture condensation; second, EGEPR's low water affinity means moisture contacting the wet film is minimally absorbed into the solvent phase - preventing dissolved water concentration from rising to the level that causes NC polymer precipitation (blush).

By contrast, EGEA's complete water miscibility means it actively draws atmospheric moisture into the wet film in humid conditions - exactly the mechanism responsible for blush defects. EGEPR's limited water miscibility directly eliminates this moisture scavenging effect, making it a technically superior NC lacquer retarder for tropical and humid-environment furniture production where blush is a persistent quality problem.

Specialty gravure & screen printing inks: EGEPR's ultra-slow evaporation and low water miscibility deliver two complementary benefits in metallic foil gravure inks - slow evaporation prevents premature ink body formation at the thermally conductive cylinder surface; low water miscibility prevents atmospheric humidity from being absorbed into hygroscopic ink formulations, preventing viscosity increase and adhesion failure on non-absorbent foil and film substrates in humid press environments.

Electrical insulating coatings: EGEPR's low water miscibility and inherently high electrical resistivity of the ester solvent make it a specialty component in wire coating enamels, motor winding insulating varnishes, and PCB conformal coatings requiring high dielectric strength. Low water affinity prevents moisture absorption into the coating during cure - critical for maintaining dielectric performance in humidity-exposed electrical applications.

Metal degreasing: Strong solvency for oils, waxes, and assembly lubricants; very low water miscibility preventing emulsification in contaminated degreasing baths; high boiling point enabling heated tank degreasing at 60–90°C. A technically capable non-halogenated alternative for specific open-bath degreasing applications where TCE/PCE are being eliminated. Contact Sinolook for application-specific evaluation guidance.

Chemical synthesis & extraction: High-boiling polar ester with limited water miscibility enabling clean phase separation in pharmaceutical and agrochemical extraction processes - a useful extraction solvent for polar intermediates from non-polar reaction mixtures where water-miscible solvents would fail to provide adequate phase separation.

Property	EGEA CAS 111-15-9	EGEPR (ECP) CAS 14272-48-1	PGMP (P-series) CAS 148462-57-1
Series / Ester	E-series / Acetate	E-series / Propionate	P-series / Propionate
Mol. Formula / MW	C₆H₁₂O₃ / 132.16	C₇H₁₄O₃ / 146.19	C₇H₁₄O₃ / 146.19
Boiling Point (°C)	154–160	~168–170 ↑ highest E-series	~160–163
Flash Point (°C)	~56	~60–65 (boundary)	~55–58
Density (g/cm³)	0.973 ± 0.005	~0.968–0.973	0.945 ± 0.005
Water Miscibility	Fully miscible (100%)	~2% ↓ LIMITED - key differentiator	Fully miscible
Evaporation Rate	Moderate	Ultra-slow ↓ 20–25% vs EGEA	Slow (~20–30% vs PGMEA)
EU CLP Repr. Class.	Repr. 1B ⚠	⚠ Verify with ECHA	Not classified ✓
REACH Annex XVII	Restricted ⚠	⚠ Verify current status	Not restricted ✓
Color Spec (Pt-Co)	≤ 10	≤ 15 (specialty grade)	≤ 10
Key Strength	Established E-series; moderate bp	Highest bp; lowest water misc.; anti-blush NC lacquer	Non-Repr. certain; similar bp to EGEPR

Selection logic: Choose EGEPR for maximum E-series leveling window, oil-phase compatibility, anti-blush NC lacquer performance, or can coating moisture resistance in jurisdictions and markets where EGEPR is in compliant use under applicable regulations. Choose PGMP when regulatory certainty on Repr. avoidance is the priority - similar boiling point (~162°C), confirmed non-Repr. P-series profile, water-miscible. Choose EGEA when faster drying is preferred and E-series regulatory requirements are met in the target market.

⚠ Mandatory Buyer Action Before EU-Market Use Before incorporating EGEPR into any EU-market product, buyers must independently verify EGEPR's current EU CLP classification and REACH Annex XVII restriction status via the ECHA substance information page for CAS 14272-48-1 ↗. Regulatory classification status can change and must be confirmed against the current source. Sinolook provides the most current CLP-compliant SDS and REACH status letter with every shipment and proactively notifies customers of material regulatory changes.

⚠ Consult current SDS for authoritative GHS classification and hazard statements. EGEPR's flash point of ~60–65°C sits at the GHS flammable/combustible liquid boundary (60°C threshold). Handle as flammable liquid in all storage and processing operations until the current SDS classification for the specific production batch supplied is confirmed. Additionally, consult the current SDS for reproductive hazard status and any specific exposure controls required under the applicable classification.

Q: How does EGEPR's limited water miscibility (~2%) differ from EGEA's complete water miscibility in practical coating formulations?

The water miscibility difference has three practical consequences. First, in solvent-borne coating systems applied in humid conditions, EGEPR's low water affinity means it does not scavenge atmospheric moisture into the wet film - making it resistant to humidity-induced blush defects in NC lacquers. EGEA's complete miscibility actively draws moisture into the wet film under the same conditions. Second, in can coating applications with brief exposure to atmospheric humidity during line transfer, EGEPR prevents moisture-induced surface defects. Third, EGEPR cannot function as a coalescing agent in waterborne latex systems - EGEA and EGEE, being water-miscible, can act as coupling agents between aqueous and polymer phases in waterborne coatings, while EGEPR's limited miscibility prevents this. The EGEA/EGEPR selection depends on whether aqueous compatibility or oil-phase exclusivity is required for the specific application.

Q: Why does EGEPR have a color specification of ≤15 Pt-Co rather than ≤10?

The slightly wider color specification of ≤15 Pt-Co reflects the production realities of a lower-volume specialty ester. Propionic acid esterification of EGEE at specialty scale requires careful reaction control to minimise coloured by-products - higher temperatures or longer reaction times can generate trace impurities producing a slight yellowish tint. While ≤15 Pt-Co is perfectly acceptable for all of EGEPR's industrial applications (coating, can coating, inks, cleaning - none are sensitive to such minor color differences at typical use concentrations), buyers requiring ≤10 for specific quality-sensitive applications should specify this requirement at time of order - Sinolook will confirm availability and any applicable price adjustment.

Q: Is EGEPR suitable as a substitute for trichloroethylene or perchloroethylene in metal degreasing?

EGEPR's properties - strong oil solvency, very low water miscibility (preventing emulsification in oil-contaminated baths), high boiling point enabling heated tank degreasing at 60–90°C, and low ambient vapor pressure - make it a technically capable non-halogenated alternative for certain open-bath metal degreasing applications where TCE/PCE are being eliminated. EGEPR does not match TCE's exceptionally low surface tension (critical for penetration into tight tolerances and blind holes) or non-flammable classification. For accessible surface degreasing of light-to-medium oils and assembly lubricants, EGEPR provides effective performance with lower environmental persistence than chlorinated solvents. Conduct comparative cleaning effectiveness evaluation under your specific process conditions; contact Sinolook for application guidance and samples.

Q: What is the difference between ECP and EGEPR - are they the same compound?

Yes - ECP (Ethylene Cellosolve Propionate) and EGEPR are the same compound: CAS 14272-48-1, systematic name 2-ethoxyethyl propanoate. 'ECP' uses the historic Cellosolve brand name for EGEE derivatives; 'EGEPR' follows the modern glycol ether naming convention (EGE = ethylene glycol monoethyl ether; PR = propionate). In procurement and regulatory documents, always verify using CAS 14272-48-1 and molecular formula C₇H₁₄O₃ to avoid confusion with structurally similar compounds: EGEA (CAS 111-15-9, the acetate ester) shares the same backbone but different ester group; PGMP (CAS 148462-57-1) and PGEA (CAS 54839-24-6) are constitutional isomers with the same formula but P-series backbone. Confirm via ECHA (EC 238-143-5) or PubChem CID 25228.

Q: Why is the acidity of EGEPR expressed as propionic acid rather than acetic acid?

EGEPR's acidity is correctly expressed as propionic acid (MW 74.08 g/mol) - the actual hydrolysis product of the propanoate ester linkage (EGEPR + H₂O → EGEE + propionic acid). Acetic acid (MW 60.05 g/mol) is only the correct reference for acetate esters (EGMEA, EGEA, PGMEA, DEGEAC etc.). Expressing EGEPR acidity as acetic acid - as some suppliers do by applying the EGEA test template without correction - systematically understates actual acidity by approximately 19% (MW ratio: 60.05/74.08), masking propionic acid accumulation from ester hydrolysis during storage. This matters particularly for coating applications where propionic acid buildup can affect resin crosslink chemistry or metal surface compatibility. Sinolook's specification uses the technically correct propionic acid reference, ensuring accurate hydrolysis monitoring throughout the product's shelf life.

Related products: PGMP (Propylene Glycol Monomethyl Ether Propionate) - non-Repr. P-series alternative  ·  EGEA (Ethylene Glycol Monoethyl Ether Acetate)  ·  EGEE (Ethylene Glycol Monoethyl Ether / Cellosolve)  ·  DEGEAC (Diethylene Glycol Monoethyl Ether Acetate)  ·  PGEA (Propylene Glycol Monoethyl Ether Acetate)