🧪 PEEK
PEEK Plastic Suppliers and CNC Machining in San Bernardino, CA — Unfilled, Glass-Filled, and Carbon-Filled Stock
Polyether ether ketone — PEEK — occupies the top tier of engineering thermoplastics, delivering metal-comparable stiffness, continuous service to 480°F, and resistance to virtually every industrial chemical except concentrated sulfuric acid. For San Bernardino procurement teams supporting automotive drivetrain component programs, heavy-equipment hydraulic systems, or aerospace-adjacent structural applications, PEEK's performance envelope justifies its cost premium over nylon, Delrin, and other commodity engineering plastics. The Inland Empire's growing concentration of precision machining shops capable of holding ±0.001-inch tolerances in PEEK means buyers can source machined components locally rather than waiting on coastal or out-of-state lead times.
ISO 9001ISO 13485AS9100
Three PEEK Grades and When Each One Earns Its Cost in Inland Empire Applications
Unfilled PEEK (natural, semi-crystalline) is the baseline grade — Victrex 450G or equivalent — with a tensile strength of approximately 14,500 PSI, flexural modulus of 595,000 PSI, and continuous service temperature of 480°F. It's the correct specification for chemically exposed components, electrical insulators, and applications requiring dimensional stability across a wide temperature range. In San Bernardino's automotive supply chain, unfilled PEEK appears in transmission fluid seals, valve stem guides, and sensor housings that must survive under-hood temperatures and prolonged contact with ATF, power steering fluid, and brake fluid. Its inherent resistance to hydrolysis makes it superior to nylon in steam or hot-water environments — relevant for commercial vehicle coolant system components manufactured by Inland Empire Tier 2 suppliers.
Glass-filled PEEK (typically 30% glass fiber reinforcement) raises flexural modulus to approximately 1,450,000 PSI and significantly reduces thermal expansion — the coefficient of thermal expansion drops from 26 × 10⁻⁶ in/in/°F for unfilled PEEK to roughly 11 × 10⁻⁶ in/in/°F with 30% glass. This makes glass-filled PEEK the preferred choice for structural brackets, bearing housings, and press-fit components where dimensional stability across temperature cycles is critical to function. The tradeoff is reduced chemical resistance in some environments (glass fiber can wick moisture along fiber-matrix interfaces) and reduced machinability compared to unfilled PEEK — glass fiber is abrasive to cutting tools, and carbide tooling with fresh edges is mandatory.
Carbon-filled PEEK (typically 30% carbon fiber) delivers the highest stiffness and lowest friction of the three grades. With a flexural modulus approaching 2,500,000 PSI and a dynamic coefficient of friction against steel of 0.05–0.12 (depending on load and speed), carbon-filled PEEK is specified for bearing pads, thrust washers, and sliding wear components in aerospace, heavy equipment, and semiconductor equipment applications. Its thermal conductivity is approximately 1.0 W/(m·K) versus 0.25 W/(m·K) for unfilled PEEK, which helps dissipate frictional heat in bearing applications. Carbon PEEK is electrically conductive (surface resistivity typically 10²–10³ Ω/sq), which is a benefit in ESD-sensitive semiconductor applications but must be accounted for in electrical isolation designs.
Machining PEEK to Precision Tolerances at San Bernardino CNC Shops
PEEK machines cleanly with sharp carbide tooling and proper process parameters. Cutting speeds for unfilled PEEK typically run 800–1,500 SFM with HSS tooling and 1,500–3,000 SFM with carbide, producing continuous chips that clear easily from pockets and bores. The key process variable for tight-tolerance PEEK machining is temperature management: PEEK's thermal expansion (26 × 10⁻⁶ in/in/°F for unfilled) means that heat generated during cutting can cause dimensional shift of 0.001–0.003 inch on a 1-inch feature for every 40°F temperature rise in the workpiece. San Bernardino shops holding ±0.001-inch tolerances on PEEK use flood coolant or compressed air cooling, avoid multiple-pass roughing without temperature equalization breaks, and measure critical dimensions with the part at 68°F per ASME Y14.5 standard conditions.
Thread cutting in PEEK requires attention to material springback in the cut: single-point threading with a sharp insert and conservative chip load produces cleaner thread flanks than die-cut threads, which can tear at minor diameters in semi-crystalline PEEK. For high-volume PEEK thread production in San Bernardino shops, form taps (cold-forming rather than cutting) produce stronger threads with better surface finish than cut taps, taking advantage of PEEK's moderate ductility in the semi-crystalline state.
Fixturing PEEK parts for machining requires care to avoid distortion from clamping pressure. PEEK's relatively low compressive yield strength (17,500 PSI for unfilled, 23,000 PSI for glass-filled) means heavy clamping forces on thin-wall sections can cause deflection that shows as dimensional error after releasing the fixture. Vacuum chucks and soft jaws are common fixturing approaches in Inland Empire shops that regularly machine PEEK for aerospace and automotive customers. For thin disks and plates under 0.25-inch thick, double-stick tape to a precision-ground sacrificial plate is a practical approach for single-setup machining.
PEEK Stock Forms and Lead Times in the Southern California Market
Unfilled PEEK rod in diameters from 0.25 inch through 6 inches and plate in thicknesses from 0.125 inch through 4 inches are stocked by Southern California plastics distributors with warehouse locations accessible to San Bernardino. Typical lead times for standard stock sizes are 2–5 business days to a San Bernardino dock. Glass-filled and carbon-filled PEEK are also stocked in common rod and plate sizes by specialty distributors, though the selection is narrower — expect 3–7 business days for the most common grades and custom-order lead times of 2–4 weeks for non-stock sizes.
PEEK tube stock is less widely stocked but is available in standard OD/ID combinations for applications requiring bores larger than what's practical to drill from solid rod. Extruded PEEK tube in OD ranges from 0.5 inch through 6 inches is available from specialty extruders with 2–4 week lead times for non-stock sizes. For high-volume PEEK components, compression-molded billets (isotropic semi-finished stock with improved dimensional stability compared to extruded rod) are available from primary resin producers' distributors; lead times run 4–8 weeks but the dimensional stability advantage justifies the wait for precision aerospace and automotive components.
Raw PEEK resin for injection molding is available through Victrex, Solvay, and Evonik distribution networks with delivery to San Bernardino. Injection molding PEEK requires barrel temperatures of 370–400°C and mold temperatures of 160–180°C — process conditions that are beyond standard thermoplastic injection molding equipment, so buyers should confirm that their molder has PEEK-capable machines before quoting. Several Southern California injection molders have PEEK-capable presses and serve the Inland Empire automotive and aerospace markets.
Qualification and Traceability Requirements for PEEK in Automotive and Aerospace Supply Chains
Automotive Tier 1 and Tier 2 suppliers in San Bernardino working under IATF 16949 quality management systems require material traceability for PEEK components back to the resin lot and certification of conformance to relevant ASTM or proprietary material specifications. ASTM D6779 covers classification and testing requirements for PEEK materials; buyers should specify compliance to this standard and require certificates of conformance (CoCs) and lot traceability documentation with each shipment.
For aerospace-adjacent applications — components routed through the Southern California defense supply chain — AS9100 certification of the machining supplier and material traceability per AS9102 first article inspection requirements apply. PEEK qualified to ASTM D6779 with documented resin lot traceability satisfies most AS9100-based material control requirements. For critical structural PEEK components in aerospace applications, buyers may additionally require tensile and flexural property testing on witness bars from the same billet used for production parts.
Medical device applications for PEEK — relevant to Southern California's medical device manufacturing community — require biocompatibility certification per ISO 10993 or USP Class VI. Not all commercially available PEEK grades are certified to these standards; medical-grade PEEK (such as Invibio PEEK-OPTIMA) is a distinct product with controlled supply chains. San Bernardino-area buyers should verify medical grade status before ordering PEEK for any device that contacts the human body directly or indirectly. ManufacturingBase supplier profiles note whether listed PEEK suppliers carry medical-grade stock.
Cost-Benefit Analysis: PEEK vs. Metal for Inland Empire Component Conversions
PEEK raw stock costs $60–$150 per pound depending on grade and form, compared to $1.50–$3.00 per pound for aluminum 6061 and $0.40–$0.80 per pound for carbon steel. For a direct material cost comparison, PEEK appears dramatically more expensive — but the engineering economics often shift when total part cost is calculated. PEEK's density (1.32 g/cc) is roughly half that of aluminum (2.71 g/cc), so a PEEK part weighs 49% less than the same geometry in aluminum, compressing the per-part material weight comparison. PEEK's machinability from stock also enables consolidation of multiple metal components into a single machined PEEK part, eliminating assembly labor and fastener costs.
For San Bernardino automotive suppliers, the conversion economics typically favor PEEK over aluminum or steel when the part experiences elevated temperature above 250°F, requires chemical resistance to engine fluids, involves a bearing or sliding function where PEEK's inherent lubricity reduces lubrication system complexity, or must meet weight reduction targets for CAFE compliance programs. Break-even analysis on injection-molded PEEK versus machined PEEK versus aluminum at volumes typical for Tier 2 suppliers (5,000–50,000 pieces per year) generally shows that injection-molded PEEK becomes cost-competitive with machined aluminum above 2,000–5,000 annual pieces once tooling amortization is spread over the program life. ManufacturingBase can connect buyers with PEEK injection molders and machining shops for parallel quotes to accelerate this analysis.
Frequently Asked Questions
Unfilled PEEK (natural semi-crystalline) provides the best chemical resistance and electrical insulation, with continuous service to 480°F and tensile strength around 14,500 PSI. It's specified for chemically exposed seals, insulators, and components requiring maximum chemical inertness. Glass-filled PEEK (30% GF) triples the flexural modulus to approximately 1,450,000 PSI and significantly reduces thermal expansion, making it the correct choice for structural brackets and dimensional precision components in thermal cycling environments. The downside is reduced chemical resistance and abrasive tooling wear during machining. Carbon-filled PEEK (30% CF) offers the highest stiffness (flexural modulus up to 2,500,000 PSI), lowest friction coefficient against metal mating surfaces (0.05–0.12 dynamic CoF), and electrical conductivity — it's the bearing and wear component grade of choice in aerospace, semiconductor equipment, and heavy-equipment pivot applications. Carbon PEEK should not be used in applications requiring electrical isolation. Each grade commands a different price premium: unfilled PEEK is least expensive, glass-filled adds 20–30%, and carbon-filled typically adds 40–60% over unfilled stock prices.
Yes, but PEEK injection molding requires specialized equipment not available at standard thermoplastic molders. PEEK processing temperatures run 370–400°C at the barrel (vs. 200–260°C for nylon or polycarbonate), and mold temperatures of 160–180°C are required to achieve proper crystallinity in the molded part. Under-heated molds produce amorphous PEEK with significantly lower mechanical properties and heat resistance than properly crystallized semi-crystalline PEEK. Several Southern California injection molders serving the Inland Empire have PEEK-capable machinery — typically 50–200 ton presses with high-heat barrel packages and temperature-controlled molds. Economic injection mold tooling for simple PEEK components starts around $15,000–$25,000; complex multi-cavity tools can exceed $80,000. Production economics favor injection molding over machining from stock above approximately 2,000–5,000 pieces per year for most PEEK geometries. ManufacturingBase can connect San Bernardino buyers with qualified PEEK molders for competitive quotes.
PEEK outperforms nylon (PA6, PA66) and polycarbonate significantly in the critical failure modes for under-hood automotive applications. Nylon's continuous service temperature tops out around 250°F (PA66 heat-stabilized), and it absorbs moisture that degrades dimensional stability and mechanical properties — both serious limitations near engine bay heat sources and in contact with coolant or steam. Polycarbonate offers good impact resistance but has poor resistance to many automotive fluids (gasoline, ATF, coolant additives) and limited heat resistance above 270°F. PEEK's 480°F continuous service temperature, near-zero moisture absorption (0.1% vs. 1.5–3.0% for nylon), and resistance to virtually all automotive fluids makes it the specification for transmission components, fuel system seals, and sensor housings in direct contact with hot oil or coolant. The price premium (PEEK stock costs roughly 20–40× nylon by weight) is justified only when the application genuinely requires these properties; for ambient-temperature structural brackets and non-fluid-contact components, nylon 66 or acetal remain more economical choices for San Bernardino automotive Tier 2 buyers.
Experienced CNC shops in the Inland Empire with proper thermal management protocols can hold ±0.001 inch on precision features in unfilled PEEK and ±0.0005 inch on bores and diameters when measurement and machining are both performed at controlled 68°F conditions. Glass-filled and carbon-filled PEEK, being more dimensionally stable due to lower thermal expansion, can be held to similar or slightly tighter tolerances with less sensitivity to temperature variation during machining. Thread tolerances of 2B/2A (standard class) are straightforwardly achievable in PEEK; 3B/3A (precision class) requires careful single-point threading and tool wear management. Surface finish on machined PEEK typically achieves 32–63 Ra microinches with standard carbide tooling; polishing or skiving operations can improve this to 8–16 Ra for bearing surfaces or optical-clarity applications. Thin-wall features below 0.060 inch require specialized fixturing to prevent deflection during machining. For critical mating dimensions, always specify final measurement at 68°F and confirm with the machining shop that their CMM room is temperature-controlled.
Last updated: July 2026
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