VALOX™ 4521 PBT 20% Glass Reinforced Resin. Heat Thermal Stability

Flame Retardant Series & Chemical Resistance. High CTI with High RTI

VALOX™ 4521 Resin is a 20% Glass Fiber Reinforced Flame-Retardant PBT (Polybutylene Terephthalate) Engineering Resin designed to provide an excellent balance of High Heat Performance, Electrical Reliability, Chemical Resistance, and Dimensional Stability. As Part of the VALOX™ Flame-Retardant Portfolio, this Grade is engineered to support demanding Electrical and Electronic applications where both Mechanical Durability and Safety Compliance are Critical.

The Incorporation of 20% Glass Fiber Reinforcement enhances the Stiffness and Strength of VALOX™ 4521 while maintaining good Dimensional Accuracy. This Reinforcement also contributes to Low Warpage Characteristics, helping manufacturers achieve improved Part Consistency and Tighter Assembly Tolerances for Precision-Molded Components.

A Key Feature of VALOX™ 4521 Resin is its excellent Thermal Stability and Heat Endurance Performance. The material is Capable of maintaining Mechanical Integrity and Electrical performance under Elevated Operating Temperatures, making it suitable for Long-Term use in demanding Electrical Environments. In addition, the Polyester Structure provides excellent Chemical Resistance, helping protect components from Oils, Greases, Cleaning Agents, and Industrial Chemicals.

Beyond its Mechanical and Thermal Advantages, VALOX™ 4521 delivers Outstanding Electrical performance through its High Comparative Tracking Index (CTI) and High Relative Thermal Index (RTI) Characteristics. These properties Help Improve Insulation reliability and reduce the Risk of Electrical Tracking in Safety-Critical applications. Additional Benefits include good Color Stability, excellent Adhesion to Epoxy Materials, and Laser Markability, supporting Modern Manufacturing and Traceability Requirements.

Due to its combination of Flame Resistance, Electrical Performance, Dimensional Stability, and Processing Reliability, VALOX™ 4521 is frequently selected for engineered components where Long-Term reliability and Regulatory Compliance are important Design Priorities.

RoHS Compliance: VALOX™ 4521 Resin supports RoHS Requirements, helping manufacturers reduce the use of Restricted Hazardous Substances while maintaining Dependable Engineering Performance.

Notes:

VALOX™ 4521 PBT Resin
20% Glass Fiber Reinforced
Excellent High Heat Performance
Excellent Chemical Resistance
Low Warpage Characteristics
High CTI Performance
High RTI Performance
Laser Markable
UL94 - V0 @ 0.75 mm ~ 3.00 mm
RoHS Compliant

VALOX 4521 PBT has 0.3 ~ 0.7 Shrinkage, Flow, 3.2 mm. %

Material HDT, 1.82 MPa, ASTM A648, °C

3.2 mm, unannealed 205

Vicat Softening Temperature Rate

Vicat Softening Temperature rate , B120 = 208

Material MFI / Melt Flow Rate

Melt Flow Rate, 265°C/5.0 kgf = 90

Material Melt Volume Rate, MVR

Melt Volume Rate, 265°C/5.0 kgf = 95

VALOX™ 4521 Resin has a Flexural Modulus of 7000 MPa. 2 mm/min ISO 178

VALOX™ 4521 Resin are UL94 - V-0, 0.75 mm ~ 3.00 mm Rated

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