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What is a size?

Size is a combination of different chemicals diluted, solubilized, emulsified, or dispersed in water. Also known as “binder”.

What is the composition of the sizes for textiles processing?

The specific composition of the size can vary depending on the type of textile being produced and the processing conditions.

In general, textile sizes for glass fibers may contain a combination of film-forming agents (help to coat the fiber and improve the processability during textile manufacturing), lubricants (help to reduce the friction between fibers and reduce the breakage) , wetting agents (help to absorb moisture), and antistatic agents (help to reduce static electricity buildup and minimize the attraction of dust and other contaminants. 

The specific size formulation used in textile processing can vary depending on the type of fabric being produced and the processing conditions. 

What Vetrotex sizes are heat-cleanable?

At Vetrotex, our sizes named T30, T34, T8  are easy to heat clean, even at low temperature. 

Is there a starch free size?

Yes, our TCO5 is a starch free size, especially designed to produce 6µ Wet Used Chopped Strand; It is mainly used for the production of specialty papers like filter media for liquid and for air filtration purposes.

Also, we have our TD22, TD44, and TD37 starch free plastic size system, which have an excellent compatibility with different resins.

What is the size mainly used in to produce VCY (Vinyl Coated Yarns)?

Our TD55 is mainly employed to produce VCY, according to the single end coating process. The main applications are the production of insects, pool and patio screen, and sunscreen. Our product allows an easy and uniform wetting by the plastisol, a high tensile strength, very low fuzz generation during the unwinding process. Also, the TD55 yarn coated with PVC plastisol has an excellent alkali resistance. 

What does the twist provide to the fiberglass?

The twist in fiberglass provides additional strength and durability. When fiberglass is twisted, it increases its resistance to bending and breaking, making it ideal for applications where strength is required. Additionally, the twist allows the fiberglass to be molded into a variety of shapes and configurations, making it a versatile material for a wide range of industries such as construction, aerospace, automotive, and marine. The amount of twist applied to the fiberglass can be controlled to achieve specific performance characteristics and properties, depending on the intended application.

What is the purpose of the sizes?

The purpose of a size for glass fiber is to protect the fibers from abrasion and damage during the manufacturing process, and to improve their performance in the further processing of the fiber. Also, it improves the adhesion between the glass fibers and the matrix material in composites and other end-use applications and provides additional benefits during different textile processes (e.g reducing the static charge).

Glass fibers

What is the “TEX”?

TEX" is the unit of measurement for linear mass density, specifically the number of grams per kilometer of the fiber or yarn. It's used to express the fineness or thickness of fibers. For example, if a fiber has a TEX value of 10, it means that 1 kilometer of that fiber weighs 10 grams.

What are the applications of glass fiber?

Glass fiber is used in a wide range of applications, including reinforcing materials for composites, insulation materials, textiles, filtration media, products for the constructions, and reinforcement for plastics or other materials.

What are the advantages of using glassfiber products?

Glassfiber products are lightweight, strong, durable, and resistant to heat, moisture, and corrosion. They also offer good electrical insulation, a low thermal conductivity, a dimensional stability, and are cost-effective compared to other materials.

What parameters can influence the TEX value?

The TEX value of glass fiber can be influenced by various parameters, including the variation in fiber diameter, variation in fiber tension, drawing speed, contamination of the glass composition, and inadequate heat treatment during manufacturing.

What is the future of glassfiber manufacturing?

The demand for glassfiber products is expected to increase in the coming years due to their growing use in various industries, including construction, aerospace, and renewable energy. Innovations in manufacturing technology are also expected to improve the efficiency and quality of glassfiber products.

What is the process of glassfiber manufacturing?

The process of glassfiber manufacturing typically involves melting the raw materials in a furnace at high temperatures, extruding the molten glass through small holes in a device called a bushing, and then cooling and winding the fibers onto spools or bobbins.

What is the process of glass fiber reinforcement in composites?

In composites, glass fiber is typically used as a reinforcement material, which is embedded in a matrix material such as epoxy or polyester resin. The fiber provides strength and stiffness to the composite material.

What is a glass fiber?

Glass fiber is a material made from thin strands of glass that are drawn and spun into fibers. It is widely used in the production of technical textile and also, as a reinforcement material in composite materials due to its high strength and durability.

What is the minimum and maximum twist in Vetrotex range?

The minimum is 15 t/m (twist/meter) and the maximum is 80. The twist can be produced in Z or S direction. 

How is glass fiber made?

Glass fiber is made by melting silica sand or other materials at high temperatures and then drawing or extruding the molten glass into very thin fibers.These fibers are then treated with a sizing agent to improve their handling and compatibility with other materials.


What are the most common defects of a fiberglass bobbin?

The most common defects in fiberglass bobbins include uneven winding, lost ends, fiber breaks, fuzz, contamination, and bobbin damages. Proper handling and maintenance of the bobbins can help prevent these defects and ensure the production of high-quality glass fiber products.

How is the quality of glass fiber ensured during manufacturing?

The quality of glass fiber is ensured through various quality control measures, including monitoring the chemical composition of the raw materials, testing the fiber diameter and tensile strength, and inspecting the fibers for defects.

Type of glass

What are the different types of glass fiber?

There are several types of glass fiber, including E-glass, S-glass, C-glass, and R-glass. Each type has different properties suitable for different applications. At Vetrotex, our fiberglasses are mainly composed of E-glass and C-glass.

What is the difference between E-glass and S-glass?

E-glass is the most common type of glass fiber and is known for its high strength and good electrical insulation properties. S-glass is a higher-performance type of glass fiber with even greater strength and stiffness.

What is the difference between E-Glass and C-Glass?

The primary difference between E-glass and C-glass is their chemical composition. Compared to E-glass, C-glass contains higher concentrations of silica and alkali; lower concentrations of alumina and boron. E-glass is known for high electrical insulation properties, strength, and resistance to heat. C-glass is known for chemical stability and the resistance to chemical corrosion.


What packaging can be returnable?

Empty bobbins, beams and other materials (as carton and pallets) must be returned. They can be used several times, after a strict cleaning process, which is environment friendly. 

What are our beams dimensions?

Our standard beams measure minimum 1785 mm (70,28 inches) up to maximum 3200 mm (125,98 inches).  We have a 54” wide up to 72” in our Mexican plant. 

Beams are delivered based on customer needs: e.g yarn type, number of ends, beam length.