PVC Granules for Sealing Strips

For sealing strips used in doors and windows, PVC granules are engineered into soft, flexible, and durable compounds that create effective, long-lasting seals against weather, noise, and temperature.

Product Introduction

PVC is the dominant material for door and window seals due to its excellent balance of properties. The granules are formulated into flexible PVC (PVC-P) compounds that are extruded into various profiles (like tubular gaskets, U-channels, or bulb seals). These seals are critical for improving energy efficiency, acoustic insulation, and weatherproofing in buildings.

Key Performance Requirements

For a sealing strip to perform reliably for years, the PVC granules must deliver on these core characteristics:

Performance Area	Key Requirements	Why It Matters
Elasticity & Seal	High flexibility, excellent compression set resistance, good elastic recovery.	Ensures the strip compresses to fill gaps and springs back to maintain a tight seal over thousands of open/close cycles without taking a permanent set.
Weather Resistance	Excellent UV, ozone, and temperature resistance (-30°C to +70°C).	Prevents the seal from hardening, cracking, or degrading when exposed to sunlight, ozone, and extreme seasonal temperatures.
Durability	Good tensile strength, tear resistance, and abrasion resistance.	Withstands mechanical friction during window/door operation and physical contact without tearing or wearing out prematurely.
Aging & Appearance	Resistance to color fading, mildew, and surface chalkiness.	Maintains aesthetic appearance and functional integrity over the long term without unsightly discoloration or mold growth.

Formulation & Processing

Achieving these properties requires a specialized flexible PVC formulation and precise processing:

Base Formulation: It starts with S-PVC (Suspension PVC) resin. A significant amount of plasticizers (like DINP, DOTP, or ESBO) is added to achieve the required softness and low-temperature flexibility.
Critical Additives: The mix includes heat stabilizers (e.g., Calcium-Zinc), fillers, pigments, and often UV absorbers and anti-fogging agents to meet the performance targets.
Production Process: The granules are typically processed via extrusion. The compound must have stable melt flow properties to produce seals with smooth surfaces, consistent dimensions, and no defects.

Applications

These PVC granules are used to manufacture sealing strips for:

Windows & Doors: Primary seals for casement, sliding, and tilt-and-turn windows; door bottom sweeps and perimeter seals.
Building Profiles: Seals for curtain walls, glass partitions, and prefabricated structures.
Transportation: Seals for automotive doors, trunks, and RV/container doors.

Conclusion

In short, PVC granules for sealing strips are not a generic product but a highly customized material engineered for resilience. By offering compounds that excel in weather resistance, elasticity, and long-term durability, you provide manufacturers with the essential material for creating high-performance, energy-saving building components.

If you have a specific hardness (Shore A) range or a particular color requirement in mind, I can help you explore the formulation adjustments needed.

Property	Technical Specification & Range	How It’s Achieved in Formulation
Density	1.24 – 1.35 g/cm³	Controlled by the base PVC resin and the type/amount of plasticizers and fillers used. Higher plasticizer content can slightly lower density.
Flexibility	Hardness: Shore A 40 – 90 Elongation at Break: Up to 400%	Primarily determined by the type and amount of plasticizer (e.g., DINP, DOTP). Higher plasticizer content (e.g., 60-100 phr) results in a softer, more flexible seal.
Durability	Tensile Strength: 8-15 MPa Tear Resistance: High Compression Set: Low	Achieved through quality PVC resin, optimal plasticizer selection for permanent flexibility, and additives like impact modifiers to prevent cracking.
Weather & UV Resistance	Withstands long-term exposure to sunlight, rain, ozone, and temperature cycling without cracking or excessive hardening.	Requires UV stabilizers (e.g., Tinuvin, benzophenones) and antioxidants to absorb UV radiation and prevent oxidative degradation at the molecular level.
Heat Resistance	Continuous Use: Up to 70°C+ Low-Temperature Flexibility: As low as -30°C	Maintained by using low-volatility plasticizers (e.g., TOTM, DIDP) that resist migration and evaporation, and efficient heat stabilizers (e.g., Calcium-Zinc).

Property

Technical Specification & Range

How It’s Achieved in Formulation

Density

1.24 – 1.35 g/cm³

Controlled by the base PVC resin and the type/amount of plasticizers and fillers used. Higher plasticizer content can slightly lower density.

Flexibility

Hardness: Shore A 40 – 90
Elongation at Break: Up to 400%

Primarily determined by the type and amount of plasticizer (e.g., DINP, DOTP). Higher plasticizer content (e.g., 60-100 phr) results in a softer, more flexible seal.

Durability

Tensile Strength: 8-15 MPa
Tear Resistance: High
Compression Set: Low

Achieved through quality PVC resin, optimal plasticizer selection for permanent flexibility, and additives like impact modifiers to prevent cracking.

Weather & UV Resistance

Withstands long-term exposure to sunlight, rain, ozone, and temperature cycling without cracking or excessive hardening.

Requires UV stabilizers (e.g., Tinuvin, benzophenones) and antioxidants to absorb UV radiation and prevent oxidative degradation at the molecular level.

Heat Resistance

Continuous Use: Up to 70°C+
Low-Temperature Flexibility: As low as -30°C

Maintained by using low-volatility plasticizers (e.g., TOTM, DIDP) that resist migration and evaporation, and efficient heat stabilizers (e.g., Calcium-Zinc).

DST PVC Granules-Formulation Designed for DWV Pipe

What Makes PVC Granules Suitable for Bookbinding Clips

Tailor-Made PVC Granules: Your Specification, Our Innovation

What is a PVC Conveyor Roller?

Challenge and Pressure Co-exists -DST PVC Granules

Short Description:

Product Detail

Product Introduction

Key Performance Requirements

Formulation & Processing

Applications

Conclusion

Parameter table

Tell me what you need