Frequently asked questions

Fiber is a reinforcing material (polypropylene, polyvinyl alcohol, or steel) that is evenly distributed throughout the volume of concrete or cement-sand mix during mixing. Unlike reinforcing mesh, which only works in a single plane, fiber creates a three-dimensional reinforcing framework throughout the entire structure. This restrains microcrack formation during the shrinkage and strength-gain stage, improves crack resistance and impact toughness, and in the case of steel fiber, increases the structure's bending and shear load-bearing capacity. Fiber does not replace calculated load-bearing reinforcement in loaded structures, but effectively solves problems where mesh is excessive or impractical: ground-supported floors, screeds, non-structural slabs, shotcrete.

PP fiber (micro and macro) is the most common and affordable type of reinforcing fiber. It is chemically inert, not subject to corrosion or the alkaline aggression of concrete, and works well to control plastic shrinkage cracking. PVA fiber has significantly higher tensile strength and elastic modulus (see PVAMIF20), giving it better bonding with the cement matrix and making it more effective at the hardened-concrete stage — controlling drying shrinkage cracks and improving surface wear resistance. PVA is more expensive than PP and is used where higher fiber load-bearing capacity is needed without switching to steel.

Dosage depends on the fiber type and task. For PP microfiber (PPMIF06, PPMIF12), the typical dosage for shrinkage crack control is 0.6–0.9 kg per 1 m³. For example, at a dosage of 0.9 kg/m³ for a 5 m³ batch, 4.5 kg of fiber would be needed. For PP mesh fiber (PPMEF20), the typical dosage is 0.9–2.0 kg/m³. For PP macrofiber (PPMAF50), dosage depends on the fiber product and reinforcement goal rather than a single industry figure — general practice for macro-synthetic fibers is roughly 3–10 kg/m³ depending on fiber geometry and the required residual flexural strength class, while our supplier's tested product is recommended at 8-10 kg/m³ for moderate-to-high reinforcement (per Certificate of Analysis), with lighter dosages viable for crack-resistance-only applications. We calculate the exact dosage for your specific task individually — contact us through the website form.

For non-structural elements — floor screeds, garden paths, loaded ground-supported slabs without high point loads — fiber fully replaces mesh in most cases and solves the task better: no installation required, doesn't shift during pouring, leaves no unreinforced zones from overlap gaps. For this purpose, polypropylene mesh fiber (PPMEF20) is well suited — thanks to its mesh-like fiber structure, it creates a denser reinforcing framework than ordinary microfiber. For structural elements (loaded foundation slabs, floor slabs, structures with design tensile forces) replacing mesh with fiber is only possible with a project calculation based on the residual strength of fiber-reinforced concrete, usually using steel fiber. The decision in each case should be made by the structure's design engineer.

Yes. All types of fiber (PP, PVA, steel) are chemically inert toward the cement matrix and do not react with superplasticizers, hardening accelerators, anti-freeze admixtures, or water-repellent compounds. Fiber can be added to the ready mix or dry blend together with other modifiers without restrictions on dosing order, except in the case of high macro- or steel fiber dosage — in this case, increased mixing time is recommended to ensure even fiber distribution and avoid clumping ("hedgehogs").

PP microfiber has practically no effect on the compressive strength of concrete — its main function is to control crack formation at an early stage, not to increase load-bearing capacity. Macrofiber increases residual flexural tensile strength and impact toughness, but they also do not replace compressive strength, which is determined by the concrete grade and mix composition. With proper dosage, fiber does not reduce concrete's strength characteristics in any respect.

The main task of microfiber is to restrain plastic shrinkage cracking, which occurs in the first hours after placing concrete due to evaporation of mixing water from the open surface. Evenly distributed fibers intercept tensile stresses at the stage when the concrete has not yet gained strength, preventing microcracks from developing into major cracks. This is especially critical for large open surfaces — floors, screeds, pads — where traditional reinforcement physically cannot prevent surface cracking.

Fiber should be stored in a dry, covered space without direct contact with moisture and without prolonged exposure to direct sunlight. Polypropylene and polyvinyl alcohol fiber have practically unlimited shelf life when storage conditions are followed — the material is chemically stable.

Select the product and package size on the product page, specify the quantity, and add it to your cart. Then proceed to checkout: enter your contact details, the delivery country, the carrier and the pickup point — the carriers available depend on the delivery country. For businesses, tick "I am ordering for a company" and provide your company details. Payment is made by bank link on the secure Maksekeskus AS payment page — after successful payment, you'll receive an order confirmation by email. For made-to-order products (PPMAF50), a contact form is used instead of the cart — we'll get in touch to agree on price and timing.

Payment is made on the secure Maksekeskus AS payment page: you choose your bank and confirm the payment in your online bank. The available payment methods are shown on the payment page. A separate B2B flow is available for businesses: after placing an order with your company details, you'll have the option to pay against an issued invoice — standard practice for regular and wholesale customers who contact us directly.

There's no minimum order size for retail orders through the website — package sizes starting from 150 g let you buy exactly what you need for a specific batch. For wholesale or recurring supply (from several tens of kilograms), we recommend reaching out directly through the contact form — for these volumes we offer individual pricing and logistics terms not tied to the standard online store packaging.

Yes, individual pricing terms are available for bulk and recurring orders. The standard package sizes on the website (150 g / 600 g / 900 g) are designed for one-off and smaller projects at a fixed retail price. If you need a recurring volume — for example, for a series of projects or a production line — contact us through the contact form with your estimated volume and purchase frequency, and we'll put together an individual offer.

Yes. The simplest way to test fiber before a wholesale purchase is to order the smallest package size (150 g) of the type you need through the standard website catalog. This amount is enough for a test batch and to evaluate compatibility with your mix, ease of dosing, and behavior during mixing. To test macrofiber PPMAF50 for a specific project, contact us through the contact form — we'll discuss a test batch individually.

Polypropylene macrofiber PPMAF50 currently doesn't have a fixed retail price on the website and is supplied made-to-order. This is because the volume, packaging, and logistics for this product are individual and depend on the scale of the project. To place an order, click "Request a price" on the product page — your request will come directly to us, and we'll contact you to calculate cost and delivery timing.

Delivery is handled through Maksekeskus Shipping to pickup points and parcel lockers. We deliver to Estonia, Finland, Latvia and Lithuania. The carriers available for your country are shown on the checkout page — there you choose the carrier and pickup point. After payment, your order is handed over to the carrier, and the carrier notifies you when your parcel is ready for pickup.

Delivery cost depends on the delivery country, the carrier and the weight of your order, and is shown on the checkout page before payment — no hidden fees. Delivery to Finland usually costs more than within Estonia, Latvia and Lithuania. For wholesale orders with individual logistics, delivery cost is agreed separately when ordering through the contact form.

Within Estonia delivery usually takes 1–2 business days from payment confirmation, to Finland, Latvia and Lithuania usually 2–5 business days, depending on the carrier and the selected pickup point.

Direct pickup from our warehouse isn't available — every order is delivered by the carrier you choose to a pickup point or parcel locker. The carriers available for your country are shown at checkout, and in every delivery country you can choose from a wide network of pickup points and parcel lockers.

Yes, but since PPMAF50 is made-to-order rather than ordered through the standard cart, logistics for it is arranged individually — depending on the batch size, this can be a parcel to a pickup point or parcel locker or a separate freight company for palletized or large-volume shipments. Delivery terms are discussed during order confirmation after you reach out through the contact form.

Yes, B2B is one of our core business areas — we work with companies in Estonia, Finland, Latvia and Lithuania. On the checkout page, tick "I am ordering for a company" and provide your company name, registration number and VAT number (if applicable). This information is submitted with your order and used to prepare the invoice after payment; the invoice is sent to the e-mail address given in the order.

Our company is not VAT-registered, so the VAT number field on the B2B form can be left blank — it has no effect on order processing or invoicing. To place an order, it's enough to provide your company name and registration number; the VAT number is optional. The invoice is sent to the email given with the order.

Once you place your order with "I am ordering for a company" ticked and provide your company details, the order is processed through the same secure Maksekeskus AS payment page. As soon as payment is confirmed, we receive a notification with the full order details and company information, and we issue an official invoice to the email provided shortly after. Since our company is not VAT-registered, the invoice is issued without VAT. Invoices are issued the same way for companies in Estonia, Finland, Latvia and Lithuania.

There's no hard minimum for placing a B2B order through the website — a business can order any package size through the standard catalog, providing their company details. However, for recurring supply tied to a production cycle or a series of projects, we recommend discussing terms directly through the contact form — this allows us to agree on individual pricing, a fixed delivery schedule, and, if needed, non-standard packaging.