Vespel SP-1 is a premium unmodified thermosetting polyimide sheet, uniquely formulated with zero reinforcing fillers and manufactured into a uniform brown plate. As the base benchmark grade for the entire Vespel PI product line, it abandons conventional filler modification adopted by SP-21, SP-22 and SP-3, retaining the pure inherent molecular properties of polyimide resin. This design eliminates filler-induced performance trade-offs, delivering balanced ductility, electrical stability and chemical inertness that modified grades cannot match.
Engineered for versatile extreme-condition operation, SP-1 performs stably in ambient air at sustained temperatures ranging from -196°C to 288°C, and withstands transient peak temperatures up to 480°C without structural failure. Its pure resin structure boosts long-term load resistance significantly: creep resistance is 40% higher than generic polyimide materials, paired with a 60°C elevation in heat distortion temperature. Coupled with the highest tensile elongation among all Vespel SP-series products, it excels in dynamic and continuous load scenarios where rigid filled PI sheets are prone to fatigue and deformation.
Unique Functional Properties of Unfilled Vespel SP-1 Plates
Distinct from filler-reinforced Vespel grades optimized for lubrication or low thermal expansion, SP-1’s core strengths lie in high purity, reliable electrical performance, flexible mechanical ductility and biological stability. It is the ideal choice for scenarios prohibiting foreign filler contamination:
1. Full-spectrum Extreme Temperature Adaptability
Without any filler interference, pure polyimide molecular structure delivers ultra-stable thermal performance with no fixed melting point. It retains complete mechanical rigidity and insulating capability across -269°C to 400°C. For long-term aerial service, it maintains stable operation at -196°C to 288°C, and withstands instantaneous high-temperature shocks up to 480°C. It resists embrittlement at ultra-low temperatures and softening deformation at high temperatures, adapting to alternating extreme thermal environments.
2. Enhanced Ductility & Long-term Anti-creep Performance
SP-1 ranks top in ductility and elongation among all Vespel SP-series products. Its filler-free structure eliminates internal stress concentration caused by graphite or molybdenum disulfide particles, delivering a tensile strength over 100 MPa and impact strength of 261 kJ/m². With 3–4 GPa stable elastic modulus, 40% higher creep resistance and 60°C higher heat distortion temperature than ordinary PI, it effectively prevents permanent deformation under sustained static and dynamic loads, extending service life of precision structural parts.
3. Ultra-low Dielectric Loss for High-precision Insulation
SP-1 is a premium low-dielectric insulating material tailored for high-sensitivity electronic equipment. Its dielectric constant can be optimized below 2.4, with dielectric loss maintained at 10⁻⁴ level, far superior to most engineering plastics. It features 128–180 seconds arc resistance and F-to-H high-grade insulation, with stable 4.0 dielectric constant at 1000Hz frequency. The uniform pure resin structure avoids dielectric fluctuation caused by filler uneven distribution, ensuring zero signal interference and safe insulation for high-precision electrical components.
4. Self-repairing Radiation Resistant Structure
Thanks to its dense aromatic ring molecular framework, SP-1 possesses excellent radiation tolerance and unique micro self-repairing properties. The molecular resonance system efficiently dissipates radiation energy and prevents main chain fracture. Minor structural damage induced by long-term ray irradiation can be repaired via molecular micro-movement, ensuring minimal performance attenuation in radiation-intensive working environments.
5. Additive-Free Flame Retardancy & Environmental Safety
Requiring no external flame retardant additives, pure SP-1 polyimide naturally achieves UL94 V-0 flame retardant rating, the highest industry safety standard. During combustion, it generates extremely low smoke density and zero toxic fumes, featuring non-toxic, harmless and environmentally friendly characteristics. This makes it highly suitable for closed cabins, medical facilities and food-contact equipment with strict safety and environmental requirements.
6. Superior Chemical Inertness & Sterilization Durability
SP-1 demonstrates excellent solvent resistance against most conventional industrial chemicals, only soluble in individual polar solvents such as NMP and DMF. Its stable molecular structure withstands thousands of repeated high-temperature and chemical sterilization cycles without aging, cracking or performance degradation. The non-contaminating, biocompatible property enables stable application in medical device and food processing equipment accessories.
Industry Application Scenarios
Supported by high purity, stable insulation, biological safety and anti-deformation performance, Vespel SP-1 plates are widely adopted in high-end industries with strict purity and precision requirements:
Aerospace Industry: High-purity insulating structural components, extreme temperature resistant precision accessories for aviation and spacecraft equipment
Electrical & Electronics Industry: Low-loss dielectric substrates, high-precision insulation parts for communication and electronic devices
Precision Mechanical Equipment: Long-term load-bearing structural parts, anti-fatigue and anti-deformation mechanical accessories
Automotive Manufacturing: High-temperature resistant interior components including instrument panels, bumpers and steering system accessories
Medical & Food Processing: Repeatedly sterilizable safe contact parts, non-toxic structural accessories for medical and food machinery
General High-precision Industry: Custom insulating and structural plastic parts for various precision industrial equipment
Manufacturing Strength & Service Highlights
Guangzhou Ideal Plastic is a professional manufacturer focused on pure unfilled Vespel SP-1 polyimide plates. We insist on pure imported raw materials and optimized molding processes to eliminate filler contamination and performance instability, delivering high-purity, high-consistency PI sheets for global high-end industrial clients.
Pure Imported Raw Material Guarantee: Adopt authentic DuPont pure polyimide resin powder with zero filler doping and zero recycled materials, ensuring ultra-high purity and stable molecular performance of finished products.
Optimized Molding Process: Mature compression molding technology improves internal structural compactness, ensuring flat plate surface, precise dimension and stable batch consistency without warping or delamination.
Full-process Traceable Quality Control: Complete laboratory testing equipment and strict inspection procedures cover raw material incoming check, production monitoring and finished product verification. Each batch is equipped with official third-party test reports for full quality traceability.
Global Compliance Certification: ISO9001 certified factory, products compliant with RoHS and REACH international environmental standards, meeting global market access requirements.
Flexible Customization Service: Support single-piece prototype orders and free sample testing, provide one-stop secondary precision processing to meet personalized dimensional and structural customization demands.
FAQ
Q1: What makes Vespel SP-1 different from SP-21, SP-22 and SP-3?
A: The core difference lies in the formula configuration. SP-1 is a 100% unfilled pure polyimide grade, while other SP-series products adopt graphite or molybdenum disulfide filling. Without filler addition, SP-1 delivers higher purity, better ductility, lower dielectric loss and safer biological performance. It is specially designed for high-purity insulation, medical sterilization and precision electronic scenarios where filled modified PI materials are not applicable.
Q2: What are the exclusive application advantages of unfilled SP-1?
A: Unlike filled PI sheets optimized for lubrication or low expansion, SP-1 focuses on pure structural and electrical stability. It features superior anti-creep performance to resist long-term load deformation, ultra-low dielectric loss to avoid electronic signal interference, and natural non-toxic flame retardancy. It supports repeated industrial sterilization, making it irreplaceable for medical, food-grade and high-precision electronic applications.
Q3: Can I get free SP-1 samples for performance verification?
A: We provide free standard stock samples of Vespel SP-1 plates for client performance testing and project verification. Customers only need to bear the freight cost. All bulk production products strictly follow sample specifications, material purity and mechanical indicators to ensure consistent quality between samples and mass shipments.
Q4: What is your purchasing threshold for SP-1 plates?
A: We support low-threshold procurement for standard semi-finished SP-1 plates with an MOQ of 1 piece, perfectly matching R&D testing, prototype production and small-batch trial orders. The minimum quantity for custom processed parts will be flexibly confirmed based on product structure and processing difficulty.
Q5: How do you guarantee SP-1 product quality stability?
A: We exclusively use genuine DuPont imported raw materials with stable and reliable base performance. The whole production process implements standardized quality control, with professional laboratory testing for each batch. All finished products are delivered with complete test reports and traceable quality records, ensuring stable batch performance and industrial-grade reliability.
Q6: What is your after-sales service policy?
A: We provide reliable after-sales protection for factory quality defects, dimensional errors and processing flaws that affect normal use, offering free replacement or refund with full logistics cost coverage. For non-quality issues such as customer mis-ordering, intact and resalable unused products support return and exchange, with customers responsible for relevant shipping fees.
Custom Processing & Bulk Order Inquiry
We offer one-stop solutions for Vespel SP-1 pure polyimide plates, covering standard plate supply, non-standard size customization and precision secondary processing. Our high-purity SP-1 sheets serve diverse high-end industries including aerospace, electronics, medical treatment and precision machinery.
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