With PVC Modification at the Core,
Providing a Deterministic Material Foundation for Cable Performance
Longzhiyi Cable Polymer New Materials Division focuses on the R&D and manufacturing of polyvinyl chloride (PVC) modified materials for wires and cables. We do not engage in generalized "material trading"; instead, we concentrate on the main channel of PVC, integrating formulations, processes, and cable extrusion scenarios to provide stable, compliant, and customizable material solutions for insulation and sheathing.
A Focused Division Dedicated Solely to Professional PVC Modification Issues
PVC is one of the most widely used and complex matrices in the cable industry. Our positioning is clear: to deepen and master PVC modification, enabling cable manufacturers to reduce machine adjustments, scrap rates, and risks at the extrusion end.
PVC as the Sole Matrix Mainline
Focusing on plasticization, stabilization, flame retardancy, filling, and functional modification of the polyvinyl chloride system, we avoid generalized "do-it-all" modifications; all technical accumulation is deposited on the single mainline of PVC.
Designed for Cable Extrusion Scenarios
From internal mixing and plasticization to extrusion granulation, and then to actual extrusion at cable factories, the entire process takes extrusion processability, surface condition, and batch consistency as design constraints, rather than pursuing laboratory indicators in isolation.
Compliance First
System design is premised on environmental compliance, phasing out lead salt stabilizers, fully aligning with calcium-zinc composite systems and RoHS, REACH requirements, supporting export and high-end cable applications.
Co-defining Materials with Customers
Joint development with customers from performance targets, color numbers to extrusion process windows; materials are not "optional" standard products, but forward-designed around customer cabling needs.
Six Modification Dimensions, Material Design Logic of On-demand Combination
The essence of PVC modification is the rebalancing of "performance, cost, and processability". With six independently adjustable technical levers, we precisely match the operating requirements of different cables.
Heat and Thermal Stability Modification
Determines the long-term service temperature and processing safety window
- Replace lead salts with calcium-zinc composite thermal stabilization system, balancing initial coloring, long-term thermal stability, and environmental compliance
- Combined with β-diketone and antioxidant synergistic package to improve tensile strength and elongation retention after 150°C thermal aging
- Select TOTM, trimellitate migration-resistant plasticizers to support long-term temperature resistance grades of 90°C / 105°C / 125°C / 150°C
Flame Retardancy and Smoke Suppression Modification
Control flame spread and smoke emission while maintaining flexibility
- ATH / MDH compound flame retardant + zinc borate / zinc stannate synergist, build an endothermic charring flame retardant system, balancing smoke suppression
- Adopt phosphate flame retardant plasticizer to achieve "plasticization-flame retardancy" integration, reducing reliance on traditional halogen-antimony systems
- Designed for standards: combustion test requirements such as GB/T 18380, UL 1581 VW-1, IEC 60332-1
Low Temperature and Flexibility Modification
Solve the problems of sheath cracking and bending hardening in cold environments
- Introduce adipate polyester (DOA type), cold-resistant polyester plasticizer to partially replace the main plasticizer, greatly reducing the glass transition temperature
- Supplemented by CPE / NBR / TPU elastomer toughening to improve extreme cold impact and crack resistance, brittle temperature can reach -50°C and below
- Special optimization for scenarios such as extreme cold regions, cold zone engineering, outdoor laying, mobile drag chains
Oil and Chemical Media Resistance Modification
For long-term oil resistance requirements of equipment cables, automotive wires, and industrial environments
- Through PVC / CPE blending and cross-linkable modification, significantly reduce the precipitation and migration of plasticizers in oil media
- Optimize the "pinning effect" of nano mineral fillers (montmorillonite, modified clay) to improve mechanical property retention after oil resistance
- Support定向 design according to indicators such as IRM 903 oil aging (70°C/100°C×168h)
Electrical Properties and Insulation Reliability
Ensure the dielectric and volume resistance stability of insulation grade materials
- Select high polymerization degree suspension type porous PVC resin, combined with calcined kaolin / activated calcium carbonate to regulate dielectric properties
- Control water content, ionic impurities and VCM residues to ensure long-term stability of volume resistivity and voltage resistance
- Suitable for 450/750V and below power, control, and building wire insulation systems
Weather Resistance, UV Resistance and Appearance Texture
Make materials withstand outdoor exposure and also smooth extruded surface and consistent finish
- Add rutile titanium dioxide + UV absorber to resist ultraviolet degradation and outdoor chalking, ensuring outdoor sheath life
- Customizable high gloss / matte / frosted texture to meet the requirements of equipment cables for appearance consistency and low friction (low debris)
- Color numbers cover black and commonly used RAL color systems, color difference control and migration resistance are verified simultaneously
From polymer matrix to additives — a modular, transparent , and fully traceable formulation platform.
Every modified PVC compound is the result of multiple components working in synergy. Our systematic formulation expertise enables effective technical communication with customers and rapid recipe adjustment to meet specific requirements.
Matrix Resin
- Suspension porous PVC
- Polymerization degree 1000–1300 graded selection
- Electrical properties / plasticizer absorption capacity matching
Plasticizing System
- DINP / DIDP main plasticizers
- TOTM / special heat-resistant plasticizers (support 150°C)
- DOA / cold-resistant polyester plasticizers (support -50°C)
Stabilization / Flame Retardancy
- Calcium-zinc composite stabilizer
- ATH / MDH compound flame retardant
- Zinc borate, zinc stannate synergistic smoke suppression
Filling and Reinforcement
- Activated calcium carbonate / nano scale
- Calcined kaolin (insulation grade)
- Montmorillonite nano-composite toughening
Functional Additives
- Internal and external lubrication balance system
- Antioxidant / processing aid ACR
- UV absorber / masterbatch
Note: The above is a typical system illustration. Specific formulations are forward-designed based on target standards, temperature resistance grades, and customer processing windows, and do not constitute product commitments.
Typical Technical Indicators (Representative Examples)
The following data reflect the design capabilities and common levels of our modified PVC, and do not represent guaranteed values for a specific grade. The final shall be subject to the technical agreement and actual test report confirmed by both parties.
| Performance Item | Insulation Grade (105°C) | Sheath Grade (Heat Resistant 150°C) | Flexible Oil Resistant Type (-50°C) | Test Basis |
|---|---|---|---|---|
| Temperature Resistance Grade | 105 ℃ | 125 / 150 ℃ | 105 / 150 ℃ | — |
| Shore Hardness (A, 15s) | 75–85 | 70–82 | 68–78 | GB/T 2411 |
| Tensile Strength | ≥ 15 MPa | ≥ 14 MPa | ≥ 14 MPa | GB/T 8815 |
| Elongation at Break | ≥ 200 % | ≥ 280 % | ≥ 300 % | GB/T 8815 |
| Low Temperature Brittleness | ≤ -30 ℃ | ≤ -40 ℃ | ≤ -50 ℃ | GB/T 8815 |
| Thermal Aging (136°C×168h) | Tensile strength / Elongation change rate ≤ ±25% | GB/T 8815 | ||
| Limiting Oxygen Index (LOI) | ≥ 28 % | ≥ 27 % | ≥ 27 % | GB/T 2406 |
| Oil Resistance (100°C×168h) | — | — | Elongation change ≤ 25% | Customer Method |
| Volume Resistivity | ≥ 1×10¹² Ω·cm | — | — | GB/T 1410 |
* The above data are representative values (typical), not guaranteed values (guaranteed); different formulations and batches are allowed to fluctuate within the design range, subject to the factory inspection report.
From Formulation to Pellets, Full-process Controlled R&D and Manufacturing System
Material consistency does not rely on "empirical feel", but on traceable processes and a closed-loop testing system. The division has a complete chain from formulation development, pilot testing to stable mass production.
1Formulation R&D Laboratory
Focusing on resin selection, plasticization/stabilization/flame retardant system construction and joint verification / co-development with customer, with forward design capability for formulations, rather than formula replication.
2Pelletizing and Process Pilot
Internal mixing - twin-screw extrusion pelletizing process chain, combined with temperature zone, speed and filter screen filtration (100 mesh level) control, ensuring uniform plasticization and clean surface.
3Performance and Durability Testing
Covering key items such as tensile strength & elongation (IEC 60811), thermal aging, low temperature brittleness, oil resistance, oxygen index, volume resistivity, etc., supporting third-party testing and full standard verification.
4Incoming and Batch Quality Control
Key raw material incoming inspection + batch sample retention traceability, factory full inspection, ensuring extrusion and performance consistency between different batches.
Consistency First
Batch fluctuation is the most invisible loss for cable factories. We minimize "minimize extruder re-setup across batches" through raw material standardization and lock the extrusion process window.
Processability Verification
After laboratory sampling, it immediately enters the customer's extrusion condition reproduction verification to expose mass production risks such as die accumulation, uneven plasticization, and color difference in advance.
Continuous Improvement Closed Loop
Mass production data flows back to R&D, forming a cycle of "application feedback - formula iteration - re-verification", allowing materials to evolve synchronously with customer processes.
Five-step Customization Process, Translating Requirements into Materials
From a technical communication to stable mass production supply, we make "customization" controllable, traceable, and mass-producible.
Requirement Definition
Clarify target boundaries such as standards, temperature resistance, flame retardancy, appearance, extrusion process, etc.
Scheme Design
Formulation system selection, output technical suggestions and key performance indicators
Pilot Sampling
Laboratory preparation of samples, completion of performance and durability pre-verification
Field Verification
Customer extrusion/cabling verification, joint optimization of processing window
Mass Production Delivery
Solidify formulation and process, batch quality control, stable supply
The entire process supports sample first and resident technical support. Key customers can cooperate with on-site debugging of extrusion temperature setting, screw speed matching and mold selection.
Serving Modified PVC Needs for Multi-scenario Cables
From building wires to industrial equipment cables, different working conditions correspond to different modification combinations. Our experience covers the following main application areas.
Have material challenges? Let's solve them from the formulation together.
Whether you need to match specific standards, improve extrusion processability, or make breakthroughs in single performances such as oil resistance, low temperature resistance, flame retardancy and smoke suppression, we are willing to start with a technical communication.
Longzhiyi Cable · Polymer New Materials Division | Focused on PVC Modification
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