• ✅ Ultra-high purity 99.91%, far exceeding the ≥98.0% industry standard: Extremely low residual impurities, effectively reduces side reactions during polymerization, ensures uniform molecular weight distribution, and guarantees stable optical and mechanical properties of finished polymers.
• ✅ Ultra-narrow melting point range 127.9-128.9℃, strictly within 126.0-129.0℃ specification: Narrow melting range indicates high crystallographic uniformity and excellent batch consistency, enables precise temperature control during melting processing, and fits continuous industrial polymerization production perfectly.
• ✅ White crystalline powder with excellent appearance: No chromatic aberration and no heavy metal impurities, will not cause yellowing of polymer products, especially suitable for high-transparency optical grade and food contact polymer formulations.
• ✅ Unique alicyclic ring structure: Tetramethyl cyclobutane skeleton endows polymers with higher glass transition temperature, outstanding thermal stability, chemical resistance and impact resistance, far superior to conventional linear diols.
• ✅ BPA-free safe monomer: Non-toxic and environmentally friendly, does not contain bisphenol A structure. Polymers synthesized from CBDO comply with food contact material standards, suitable for infant products and food packaging applications.
• ✅ Excellent weathering and hydrolysis resistance: The rigid alicyclic structure improves the weather resistance and hydrolysis resistance of polyester resin, extends the service life of outdoor coatings and engineering plastic products.
• ✅ Wide formulation compatibility: Can be copolymerized with terephthalic acid, ethylene glycol, neopentyl glycol and various polybasic acids / diols, flexible to adjust polymer hardness, toughness, heat resistance and processing performance.
• ✅ Multi-scenario application versatility: Suitable for high-performance copolyester, powder coating resin, engineering plastic modification, specialty adhesive, optical material and other high-end fields, a high value-added fine chemical monomer.
• ✅ Strict batch quality control: Each batch is tested for full indicators including assay and melting point, accompanied by official COA, supports quality verification for import customs clearance and factory incoming inspection.
• ✅ Stable bulk supply capacity: Mature production process, stable output and reliable quality, can support long-term stable supply for R&D and mass production of high-end polymer customers.

2,2,4,4-Tetramethyl-1,3-cyclobutanediol (commonly abbreviated as CBDO, CAS 3010-96-6) is a high-performance alicyclic diol monomer with molecular formula C8H16O2, supplied as white crystalline powder.

With a unique tetramethyl-substituted cyclobutane rigid structure, CBDO is widely used as a premium functional diol for synthesizing high-performance copolyesters, specialty coatings and modified engineering plastics. It can significantly improve the heat resistance, chemical resistance, impact resistance and weather resistance of polymer materials while maintaining excellent optical transparency. As a BPA-free safe monomer, it is an ideal raw material for food contact grade transparent polymers. This grade reaches 99.91% actual purity with narrow melting point range, featuring low impurity, good batch consistency and stable quality, fully suitable for high-end polymerization and fine chemical formulation applications.

• 2,2,4,4-Tetramethylcyclobutane-1,3-diol
• CBDO
• 1,3-Cyclobutanediol, 2,2,4,4-tetramethyl-
• CAS 3010-96-6
• EINECS 221-138-0
• Alicyclic Diol Monomer
• BPA-Free Copolyester Diol
• High Purity Cyclobutanediol

1. High Performance Transparent Copolyester (Core Application): The most important application field. CBDO is copolymerized with terephthalic acid and ethylene glycol to produce BPA-free high-transparency copolyester, which is widely used in food containers, water bottles, infant products, household appliances and medical device shells. It combines excellent transparency, impact resistance, heat resistance and chemical resistance, and is a premium alternative to traditional polycarbonate.
2. Specialty Coating & Resin: Used as functional diol monomer in high-solid powder coatings, weather-resistant industrial coatings and electrophoretic coatings. It improves the hardness, gloss, weather resistance and corrosion resistance of coating film, and endows the resin with good leveling property and mechanical properties.
3. Engineering Plastic Modification: Added to polyester, polyurethane and other engineering plastics as a modification monomer to improve the thermal deformation temperature, dimensional stability and chemical resistance of materials, suitable for manufacturing high-temperature resistant structural parts and electronic appliance housings.
4. Optical Grade Polymer Materials: Used in the synthesis of optical grade transparent resins due to its high purity and low chroma. Applied in optical lenses, display light guide plates and optical film substrates, providing excellent light transmittance and low birefringence.
5. Specialty Adhesive & Ink: Added in high-performance polyurethane adhesives and printing inks to improve adhesion, heat resistance and medium resistance, suitable for bonding of difficult-to-bond materials and high-temperature resistant ink formulations.
6. Medical & Healthcare Polymers: Used to synthesize medical grade polymer materials. Its BPA-free property and good biocompatibility make it suitable for medical device shells  and dental materials that require high safety and sterilization resistance.