Chemical name: Poly(2,6-dimethyl-1,4-phenylene ether)
Synonyms: PPE, PPO, Polyphenylene Oxide, Poly(2,6-dimethylphenylene oxide)
CAS: 25134-01-4
Molecular formula: (C8H9O)n
Specification / COA:
| Item | Standard | COA |
| Appearance | Brown granule | Complies |
| HEW (g/eq) | 950 max | 860 |
| Mn Weight (g/mol) | 1700-2100 | 1840 |
| PDI | 1.9-2.3 | 2.07 |
| Toluene Residue | 1.5% max | 0.5% |
Usage:
- High-frequency, high-speed copper-clad laminates (CCL): PPE’s exceptionally low dielectric constant (Dk 2.5-2.8) and low loss tangent (Df below 0.005) make it the preferred resin matrix for high-frequency CCL used in 5G infrastructure, radar systems, and millimetre-wave applications
- 5G communication base stations and antennas: Used in antenna substrates, power amplifier boards, and backplane laminates where signal integrity at mmWave frequencies is critical
- Automotive electronics: ADAS radar modules, infotainment PCBs, and advanced driver-assistance systems benefit from PPE’s thermal stability (Tg above 200 degrees C) and dimensional stability under underhood conditions
- High-speed digital circuit boards: Server backplanes, high-bandwidth memory modules, and AI accelerator boards requiring low-loss signal transmission at 56 Gbps and beyond
- Aerospace and defence: Phased-array radar substrates and satellite communication boards where stable dielectric properties across wide temperature ranges are essential
- Reactive epoxy blending: Hydroxy-capped PPE (HEW 860 g/eq) is co-cured with epoxy resins and curing agents to significantly lower Dk/Df of conventional FR-4 formulations while improving thermal performance
Packing: 25 kg per fibre drum or carton box with PE inner liner; customised packaging available on request.
Storage: Store in a cool, dry, well-ventilated area away from moisture and direct sunlight. Keep containers tightly sealed. Recommended shelf life: 12 months from manufacturing date.
Related Products
Further Reading: PPE Resin for High-Frequency CCL: Rising Demand and China Alternatives
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PPE (Polyphenyl ether) is a high-performance engineering resin valued for its outstanding dielectric properties, which remain stable across a broad frequency range from MHz to GHz. The hydroxy-terminated PPE oligomer (HEW at most 950 g/eq) is designed specifically for reactive blending with epoxy or cyanate ester systems, enabling formulators to produce next-generation CCL (copper-clad laminate) with Dk values below 3.0 and Df below 0.005 — critical requirements for 5G and high-speed PCB applications. The narrow molecular weight distribution (PDI 1.9-2.3, Mn 1700-2100 g/mol) ensures consistent cross-link density and predictable thermal performance. Automotive-grade applications exploit PPE’s inherent dimensional stability and resistance to hydrolysis, ensuring reliable signal performance in harsh underhood environments. Unifarm Chemical supplies this hydroxy-functional PPE grade from qualified manufacturers in China with full batch traceability and COA documentation.