Description

Polyester Rubber, Butanediol-Polytetramethylene Glycol-Terephthalic Acid, Block is a high-performance thermoplastic copolyester elastomer (TPC-ET) known for its exceptional combination of rubber-like elasticity and polyester strength. This material matters for engineers and formulators seeking durable, flexible components that resist oils, fuels, and a wide range of chemicals while maintaining performance across a broad temperature range. It is primarily needed by manufacturers in the automotive, industrial hose, wire & cable, and consumer goods sectors for creating seals, gaskets, bellows, and other demanding flexible parts.

Application

• Automotive Components: Used in CVJ boots, air ducts, seals, and vibration dampeners due to excellent oil and abrasion resistance.
• Industrial Hose & Tubing: Ideal for fuel lines, hydraulic hoses, and pneumatic tubing where flexibility and chemical resistance are critical.
• Wire & Cable Jacketing: Provides durable, flexible, and flame-retardant insulation for industrial and specialty cables.
• Consumer Goods & Sporting Equipment: Employed in high-wear items like shoe soles, grips, and protective cases for its toughness and elasticity.
• Medical Device Components: Suitable for non-implantable parts requiring repeated flexing and sterilization compatibility.
• Industrial Belts & Seals: Used in conveyor belts, gaskets, and dynamic seals for reliable performance under stress.

Basic Information

Product Name	Polyester Rubber, Butanediol-Polytetramethylene Glycol-Terephthalic Acid, Block
CAS No.	155123-66-3
Molecular Formula	Contact for details
Molecular Weight	Varies by grade (typically high polymer)
Synonyms	Thermoplastic Copolyester Elastomer (TPC-ET); Poly(butylene terephthalate)-block-poly(tetramethylene oxide) glycol; PBT-PTMG block copolymer; Copolyester Ether Elastomer; Polyester-polyether Block Copolymer; TPEE (Thermoplastic Polyester Elastomer); Hytrel®-type polymer (generic); Poly(tetramethylene ether glycol)-b-poly(butylene terephthalate)
EINECS	Contact for details

Quality Control

Our Polyester Rubber is manufactured under strict process controls to ensure batch-to-batch consistency in key properties like hardness, melt flow index, and mechanical strength. Quality is verified against internal specifications for critical parameters including intrinsic viscosity, glycol content, and thermal stability. Certificates of Analysis (COA) detailing lot-specific data are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents and excessive heat sources to prevent degradation of polymer properties. For long-term storage, a nitrogen blanket is recommended to minimize oxidative cross-linking.

Specification

Item	Specification
Appearance	Pellets or granules, color as specified
Shore Hardness (D)	40D - 72D (Grade dependent)
Melting Point (DSC)	150°C - 210°C
Tensile Strength	20 - 45 MPa
Elongation at Break	300% - 700%
Melt Flow Rate (MFR)	5 - 30 g/10 min (250°C/2.16 kg)
Specific Gravity	1.10 - 1.25

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.