As per our Shipping and Returns Policy, custom cuts and fabricated parts are non-returnable. If you need an over- or undersized item, note it under "Comments" during Checkout. Cut-to-size orders have an acceptable cut tolerance of 1/8" (0.125"), so clarify if the adjustment is to be made on the (+) or (-) side of the saw blade.Please review our full return and shipping policy here.
Measure Twice, Cut Once
Since custom cuts and fabricated parts are non-refundable, be very careful while measuring your dimensions. As each cut is nominal, even the slightest miscalculation could be costly.
How to Use a Measuring Tape
Extend your tape measure several inches to find the 1 and 2 inch markers. In between the inch markers you’ll find 16 equally spaced tick marks.
Measure by counting the increments beyond the nearest inch. As the increments decrease, so does the length of the mark. For example, 1/2" has a bigger mark than 1/4" which has a bigger mark than 1/8". The smallest mark follows at 1/16". Please be aware that some measuring tapes may have even smaller increments.
Features of a Measuring Tape: Sliding End Hook
The sliding end hook is designed for two different types of measurements. An outside measurement (where the hook of the tape hangs over an edge), requires the hook to slide out a bit to account for the thickness of the material. When making an inside measurement (where the hook will push up against a surface), the clip slides in, again, accounting for its thickness. The measuring tape self-adjusts to guarantee an accurate measurement (as far as the tape is concerned).
Sanitizing Acrylic and Polycarbonate Sheet [X]
Acrylic and Polycarbonate Sneeze Guards and like products require special care while cleaning and disinfecting. To maintain the optical clarity of sneeze guards and other acrylic or polycarbonate items, use an acrylic or polycarbonate safe cleaner like Novus Plastic Polish #1, Brillianize Plastic Cleaner, or a mild soap solution.
Please reference the following compatible cleaners when DISINFECTING acrylic and polycarbonate items. The use of commonly available commercial alcohol or ammonia-based disinfectants may cause crazing and damage.
High-Strength PAI for Metal Replacement at Extreme Temperatures
Torlon® 4203 sheet is one of the highest-performing melt-processable thermoplastics, engineered to maintain its structural integrity where many others fail. As a polyamide-imide (PAI), it offers a unique combination of metal-like performance and the design flexibility of a polymer.
This material is specifically designed for high-load structural applications where strength, impact resistance, and dimensional stability must be maintained across demanding temperature conditions. Torlon® 4203 is commonly post-cured for enhanced chemical resistance and dimensional stability; post-machining cure may be recommended for critical finished components.
Note: as a hygroscopic material, proper moisture control is recommended for maintaining tolerance in humid environments.
Looking for wear-grade or glass-reinforced options? For bearing and wear applications, we also offer Torlon® 4301 and high-stiffness Torlon® 5030 (Glass-Filled).
Why Choose Torlon® 4203 Sheet?
Torlon® 4203 (Electrical Grade) is a specialized material for high-strength structural components. It offers excellent electrical insulation, high impact strength, and high elongation compared with many other PAI stock shape grades. It is the correct choice if you need:
Extreme Thermal Stability:
Maintains strong mechanical performance in continuous service environments up to 500°F (260°C).
Superior Compressive Strength:
Provides higher compressive strength than many advanced engineering plastics under severe stress and heavy static loads.
Exceptional Toughness:
Combines high stiffness with excellent impact resistance to help reduce cracking, chipping, or brittle failure in critical parts.
Broad Chemical Resistance:
Highly resistant to many chemicals, including hydrocarbons, chlorinated solvents, aviation fluids, and automotive fluids. Strong bases, saturated steam, and some high-temperature acid systems may require an alternate material.
Low CLTE:
Features a very low coefficient of linear thermal expansion (CLTE), helping precision-machined parts maintain dimensional stability during thermal cycling.
Torlon® 4203 vs. PEEK: Which Do You Need?
While both are high-performance materials, they serve different engineering requirements.
Choose Torlon® 4203 (This Sheet) if your application involves temperatures exceeding 400°F or requires maximum compressive strength and stiffness. It is an excellent choice for high-load structural components.
Choose PEEK if your application involves strong bases, hot water, saturated steam, or high-pressure steam environments where PAI may be susceptible.
Fabrication & Machining
Torlon® 4203 is a very hard material and requires specialized machining techniques. Use carbide or PCD (polycrystalline diamond) tooling to achieve the best surface finishes. Due to its high strength, it holds threads exceptionally well. Always consult our machining guide for specific feed and speed recommendations to avoid internal stress buildup.
Material Warnings
WARNING: This product can expose you to chemicals including Titanium dioxide CAS 13463-67-7, which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov. WARNING: This product can expose you to chemicals including Tetrafluoroethylene, CAS 116-14-3, which are known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Handling: Cut sheets may have sharp edges. We recommend wearing protective gloves when unpacking and handling this material to ensure safety.
Suitability: We take pride in the quality of our materials as they leave our facility. However, because every project is unique, we cannot account for how materials are modified, stored, or used after delivery. Please perform the necessary tests to ensure this material is right for your specific application and end-use conditions.
PAINT SH
Technical Performance
Torlon® 4203 is a high-performance polyamide-imide (PAI) engineered for extreme mechanical and thermal loads. It offers excellent electrical insulation properties within the Torlon® family.
Excellent compressive strength provides strong resistance to deformation under load.
Thermal Resilience:
Continuous service temperature capability up to 500°F (260°C) with excellent property retention.
Dimensional Stability:
Very low coefficient of thermal expansion (CLTE) ensures precision tolerances are maintained during temperature swings.
Key Properties
Exceptional Toughness:
Offers some of the highest impact strength among all Torlon® grades, making it resistant to cracking and chipping.
Creep Resistance:
Maintains its shape under constant stress better than many high-performance thermoplastics.
Chemical Resistance:
Highly resistant to many organic chemicals, including automotive and aerospace fluids.
Electrical Insulation:
High dielectric strength makes it ideal for high-heat electrical connectors and insulators.
Post-Cured Performance:
Torlon® PAI parts are commonly post-cured to improve chemical resistance, wear performance, and dimensional stability.
Common Industrial Applications
Aerospace & Defense: Fasteners and high-heat structural components requiring weight reduction over metal.
Fluid Power: High-pressure valve seats, seals, and check balls for oil and gas or hydraulic systems.
Electronics: High-temperature test sockets, insulators, and semiconductor process equipment components.
Military: Precision components for high-stress mechanical assemblies.
Engineering Limitations & Alternatives
While Torlon® 4203 is a leader in strength, certain environmental factors may require specialized grades:
Sliding Wear: Torlon® 4203 provides excellent toughness and load-bearing capability, but it is not the primary wear-optimized Torlon® grade for bearing and sliding applications. Better Alternative: For bearing and wear applications, choose Torlon 4301.
Hydrolysis Sensitivity: Torlon® can be affected by high-temperature steam (hydrolysis) over extended periods. Better Alternative: For high-pressure steam environments, consider PEEK.
Structural Rigidity (Glass-Reinforced): For applications requiring even higher stiffness and lower expansion. Better Alternative: For maximum rigidity, consider Torlon 5030 (Glass-Filled).
WARNING: This product can expose you to chemicals including Titanium dioxide CAS 13463-67-7, which are known to the State of California to cause cancer. For more information go to 
WARNING: This product can expose you to chemicals including Tetrafluoroethylene, CAS 116-14-3, which are known to the State of California to cause birth defects or other reproductive harm. For more information go to