Resin

Epoxy resin E21

CAS.: 25068-38-6

Origin: Made In China

Nanjing Chem Co.,Ltd. is a China-based supplier and exporter of Epoxy resin E-21 product, other solid Epoxy resins. Epoxy resin E-21 is widely used as powder coating raw material.

008618005174481 sales@nanjingchem.com Inquiry

Product Introduction

1. Product Introduction

E21 solid bisphenol A epoxy resin is a high-performance solid epoxy polymer synthesized by bisphenol A and epichlorohydrin polycondensation reaction. It appears as pale yellow transparent solid flakes or granules under normal temperature, featuring moderate molecular weight, balanced hydroxyl and epoxy groups, stable chemical structure and outstanding comprehensive performance.

As a mainstream general-purpose solid epoxy resin grade, E21 owns wider compatibility with polyester resin, polyamide curing agent and various additives compared with low-molecular epoxy resins. It is the core raw material for solvent-based anti-corrosion coatings, electrical insulating paints, industrial adhesives and hybrid epoxy-polyester powder coatings, widely recognized by coating, electronic, chemical and construction industries worldwide.

CAS No.: 25068-38-6

2. Product Specifications

Test Item	Standard Value	Test Standard
Appearance	Pale yellow solid flake/granule, free of impurities	Visual inspection
Epoxy Equivalent Weight (EEW)	450–520 g/eq	GB/T 4612
Epoxy Value	0.19–0.22 eq/100g	GB/T 4612
Softening Point (Ring & Ball)	60–72 ℃	GB/T 12007.6
Color (Gardner)	≤ 2	Fe-Co colorimetric method
Hydrolyzable Chloride	≤ 0.003 eq/100g	Internal lab standard
Inorganic Chloride	≤ 10 ppm	Potentiometric titration
Volatile Matter Content	≤ 0.3 wt%	Gravimetric method

3. Product Key Features & Main Applications

Core Advantages of E21 Epoxy Resin

Excellent adhesion: Strong bonding force to steel, aluminum, cast iron, concrete, glass and composite substrates;
Superior chemical & corrosion resistance: Resist dilute acid, alkali, salt water, industrial solvents and salt spray, ideal for heavy anti-corrosion systems;
Perfect film-forming & leveling performance: Smooth, high-gloss coating surface after curing, uniform film without pinholes or shrinkage;
Stable electrical insulation: Low dielectric loss, high breakdown voltage, reliable insulation for electrical and electronic equipment;
Good formulation flexibility: Compatible with saturated polyester for indoor decorative powder coatings; matched with polyamide/amine curing agent for two-component solvent paint; applicable to low-temperature curing construction;
Low impurity & low chlorine grade: Stable storage without agglomeration, less side reaction during curing, long service life of finished coatings.

Main Application Fields

3.1 Powder Coatings

Epoxy-polyester hybrid powder coating: For indoor metal furniture, household appliance shells, electrical cabinets, bathroom hardware, auto interior decorative parts; high gloss, low cost, excellent decoration.
Pure epoxy anti-corrosion powder coating: Underground steel pipelines, chemical storage tanks, valves, steel structure, ship accessories, metal castings, long-term salt spray anti-corrosion protection.

3.2 Solvent-Based Anti-Corrosion & Insulation Coatings

Match with polyamide curing agent to produce two-component heavy anti-corrosion primer, floor coating primer, motor, transformer, generator winding insulation varnish, electrical equipment anti-corrosion insulating paint.

3.3 Industrial Adhesives & Composite Materials

Metal structural bonding adhesive, fiberglass/carbon fiber composite matrix resin, low-voltage electrical insulation casting potting material, construction structural adhesive.

3.4 Other Industrial Uses

Anti-corrosion printing ink carrier, epoxy molding compound, building waterproof anti-corrosion coating raw material.

4. Packaging, Storage & International Sea Transportation

4.1 Packaging Specification

25kg net weight per composite kraft bag with PE inner liner; 1.75 tons per standard plastic pallet, fully wrapped with stretch film for sea shipment. Customized bulk jumbo bag packaging is available upon buyer’s request.

4.2 Storage Requirements

Store products in cool, dry, ventilated warehouse; storage ambient temperature ≤30℃;
Keep far away from direct sunlight, open flame, heat source and strong oxidants;
All packaging bags must be tightly sealed to prevent moisture absorption and caking;
Shelf life: 12 months under standard storage conditions. If expired, re-test all technical indicators; products meeting full specifications can still be used normally.

4.3 International Ocean Shipping Instructions

Hazard Classification Confirmation: Solid E21 epoxy resin is non-dangerous goods for sea, air, land transportation. No dangerous goods grade, no UN number required for customs declaration and booking space.
Shipping Notes: Avoid long-time rain soaking and direct sunlight exposure during transit. Handle pallets gently to prevent packaging breakage and material leakage.
Export Documents Support: We can provide complete export documents including MSDS, COA (Certificate of Analysis), commercial invoice, packing list, certificate of origin for customs clearance of all countries.

5. Enterprise Introduction (Production Capacity & R&D Strength)

Our company is one of China’s leading professional manufacturers and bulk suppliers of solid epoxy resin series (E21, E12 and other bisphenol A epoxy grades). Founded in 2001, we have focused on epoxy resin R&D, production and global export business for over 20 years.

Factory Core Advantages

Large-Scale Production Base: Our manufacturing plant covers an area of 100 acres, equipped with 5 fully automatic professional epoxy resin production lines, stable annual output to meet bulk container orders from global buyers;
Powerful Independent R&D Team: More than 20% of our total employees are professional R&D engineers and laboratory testing technicians. Our R&D center independently carries out comprehensive research covering E21 and all similar solid epoxy resins, including production process optimization, high-purity low-chloride product upgrading, complete raw material testing & finished product inspection methods, and full-process waste gas, waste water, solid waste environmental protection treatment technology;
Strict Quality Control System: Every batch of E21 epoxy resin will go through full-index laboratory testing before delivery, to guarantee stable and consistent product quality for long-term cooperative customers;
Mature Global Export Service System: Our products are exported to Southeast Asia, Middle East, Europe, North America, Latin America and other regions, with rich experience in international logistics, customs clearance and cross-border trade cooperation.

6. FAQ

Q1: What is Epoxy Resin E21?

A1: E21 is a medium molecular weight solid bisphenol A epoxy resin, the most widely used general-grade solid epoxy raw material. It is solid flake/granule at room temperature, mainly used for powder coatings, anti-corrosion paints, electrical insulating coatings and industrial adhesives, with excellent comprehensive performance and wide formulation compatibility.

Q2: What specifications and grades of E21 epoxy resin can you supply?

A2: We supply standard industrial grade E21 as regular stock goods; customized low-chloride high-purity electronic grade E21 is available via R&D adjustment according to buyers’ special technical requirements. We can provide complete TDS, MSDS and batch COA for each specification.

Q3: What export trade advantages can you offer for E21 epoxy resin?

A3: We provide multiple buyer-friendly trade support:

Flexible payment terms: We accept various payment methods including T/T, L/C at sight, D/P at sight as mutually agreed by both parties;
Free sample service: Small free test samples of E21 resin are available, buyers only need to bear the international courier freight;
Accept trial order: We fully support small-batch trial orders for new customers to test product quality before placing large bulk container orders;
Complete compliance documents: We can provide standard English MSDS, batch Certificate of Analysis (COA), factory test reports and other export required documents for all shipments.

Q4: What is your company’s market positioning?

A4: Our enterprise is located in China, acting as one of the major professional manufacturers and stable bulk suppliers of E21 solid epoxy resin and related epoxy series products for global overseas purchasers. We integrate independent R&D, large-scale production and global export sales, focusing on providing cost-effective, stable-quality epoxy resin raw materials for coating, electronic, chemical composite and construction anti-corrosion industries worldwide.

Q5: Is solid E21 epoxy resin dangerous goods for international sea shipment?

A5: No. Solid E21 bisphenol A epoxy resin belongs to general industrial chemical raw material, non-hazardous cargo. It has no dangerous goods classification and no UN number, which simplifies customs declaration and container booking procedures for all international shipments.

Q6: What is your minimum order quantity?

A6: Our MOQ is 1 pallet (1.75 tons). We accept small trial orders below MOQ for new customer quality testing, with separate quotation for small batch shipment cost.

008618005174481

sales@nanjingchem.com