PVC COMPOUND

WHAT IS PVC COMPOUND

A compound is defined as a substance formed when two or more elements are chemically bonded together. But how does PVC resin transform to vinyl compound? 

New compound formulations are developed to meet an application requirement or a processing limitation. Chemists and formulation engineers create custom compounds by blending a variety of additives, modifiers and stabilizers with PVC resin to achieve specific properties.

The difference between rigid and flexible PVC compounds, in a word is – plasticizer.

Rigid PVC compounds  sometimes listed as rPVC or uPVC (unplasticized) – have high hardness, excellent mechanical properties, and high melt point. These work well in some applications, such as deck and rail or for pipe fittings, but there are other applications that call for a less rigid, more malleable material.

Flexible PVC compounds are formulated to meet performance requirements for applications such as medical tubing, electrical wiring, automotive body side molding, and garden hose just to mention a few. They are also formulated with our customer’s processability needs in mind. Flexible PVC compounds contain plasticizers, softening agents which help give them “rubber like” properties.  

Market needs, scientific advancements, regulatory guidelines and raw material economics compel R&D technicians and formulation engineers to push the envelope, looking for more versatile and cost-effective materials to use in their custom compound formulations. Due to their inherent versatility, vinyl compounds have proven to be very cost-effective materials across many markets and applications.

GENERALIZED LIST OF VINYL COMPOUND INGREDIENTS

INGREDIENT CATEGORY

DEFINITION

COMMONLY USED

DESCRIPTION

PLASTICIZERS

A substance added to a resin that promotes flexibility and inhibits brittleness

Monomeric, Polymeric, Epoxy

PVC compound is rigid at room temperature, which can make it difficult to process. Plasticizers, which are typically liquid chemical compounds, are added to PVC resin to make it flexible. The more plasticizer added to a compound, the softer and more flexible the PVC becomes. All flexible vinyl compounds contain plasticizers or alloys (see below) in order to make them less rigid and easier to process.

STABILIZERS

A chemical added to a solution, mixture or suspension to maintain it in a stable or unchanging stage

Barium/Zinc liquids, Calcium/Zinc powders, Tin Mercaptides, Organic-based (Benzotriazoles and Benzophenones for UV stabilization)

Stabilizers are essential in PVC compounds because PVC resin can degrade when exposed to elevated temperatures. Heat stabilizers help to diminish breakdown and enhance heat stability. UV stabilizers are used in compounds that may encounter direct, extended contact with sunlight.

LUBRICANTS

A substance used for minimizing friction

Fatty Acids, Metallic Soaps, Esters, Waxes

Lubricants are added to compounds to assist in the manufacturing process. They help with melt viscosity, compound flow, and to minimize both processing and molecular friction.

FILLERS

A substance added to a product to increase volume, opacity, or strength

Calcium Carbonate, Kaolin Clay, Talc

Fillers are solid materials of varying particle sizes used in the formulation of PVC compounds to improve impact performance, opacity and to add stiffness and tensile strength. Particle size and ratio of filler to resin are considerations when determining how much filler can be used without degrading the performance of a compound.

FUNCTIONAL ADDITIVES

A substance added to a compound in small quantities, typically to improve an aspect of performance

Texturing agents, Impact Modifiers, Fungicides, Flame Retardant, Smoke Suppressant

Several other types of additives may be introduced to a compound to enhance or create a unique property within the compound. (See: FireGuard®, HalGuard®, AquaGuard®).

ALLOYING POLYMERS

A polymer blend or mixture in which polymer(s) blend toegether with PVC to create a new material with different physical properties than PVC alone

Thermoplastic Polyurethane, EVA, Nitrile Rubber

Blends are created when PVC compound is blended with another polymer to achieve enhanced performance. Many times these blended compounds are used in harsh environments or when abrasion and chemical resistance is required. (See: Apex PVC Blends and Flexalloy®).

PRODUCTS

With our extensive product portfolio of vinyl, thermoplastic elastomers, nylon, colorants, and other specialty compounds and esters, we can provide highly tailored solutions for a universe of industries.

MEDICAL PVC COMPOUND

PVC resin For the production of medical equipment parts such as parts of dialysis kits Blood line set parts, etc. with ingredients that have passed biochemical tests according to JHP (Japan Hygienic PVC Association) standards and control of cleanliness at every step. Making high quality plastic pellets safe for use with the body

Products containing components from Medical PVC Compound include

  • Blood Tubing Lines
  • AV Fistula Sets
  • Blood Administration set
  • Solution Infusion Sets
  • And other medical devices
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GENERAL PVC COMPOUND

PVC resin For forming in the automotive industry And electrical appliances industry By focusing on improving the unique characteristics of plastic resin To meet the needs of customers, such as to withstand the change of temperature, chemicals and sunlight to suit the application

Products manufactured from General PVC Compound include

Car Industry Group

  • Automotive Wiring Harness
  • Car Audio Cord and Wire Assembly
  • Plug Cord & Battery Cable
  • PVC Variable / Composite Extrusion Products such as Window Molding, Roof Molding, Weather-Stripping, Inner / Outer Door Belts, PVC-Glass Run, Side-Molding and other Injection Parts

Electrical and Electronics Industry Group

  • Electronic Wire and Cable
  • Power Cord
  • Computer and Flexible Flat Cable
  • Audio / Video, Office Automation and Communication Cables
  • Wire Assembly and Wire Harness Equipment

General Product Group

  • Gasket Door of Refrigerator
  • PVC Seals and Profiles for doors, windows and general furniture products
  • Special Tubes and Hose
  • Toys and others
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RIGID PVC COMPOUND

PVC resin With specific features Suitable for the production of films, labels, packaging That needs clarity And smooth surface for easy and beautiful printing Including general grade hard plastic pellets for special forming applications that require good resistance to environmental conditions 

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SPECIAL COMPOUND

Polypropylene-glass fiber plastic resin and special elastomers that have unique characteristics in forming Resistant to temperature changes And chemicals suitable for use in the computer industry And electrical appliances industry In areas that require extra durability, such as the signal connection auto parts And equipment parts in the copier

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OUR BRANDS FOR PVC COMPOUND

1. SHOWA KASEI KOGYO CO., LTD
SHOWA GLOBAL LTD
VINA SHOWA

2. RIKEN THAILAND

3. SUNDER BIOMEDICAL

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