Glass Fiber for Concrete Mortar

[Size: 2.2 Lb / 3/4"(19mm)]
A small amount of this glass fiber goes a long way... be careful of how much you use and add more water to accommodate how it works with the concrete... our first batch we ended up needing to split into thirds and add more mix to them as we put in way too much fiber... good quality, good price. The finished product was able to be much thinner than previous batches due to having this inside the mix so it definitely helps with durability.

[Size: 2.2 Lb / 3/4"(19mm)]
I ordered this 3/4 glass fiber to help in the creation of GFRC (Glass Fiber Reinforced Concrete) planters for my yard. GFRC planters require 1/2 to 3/4 inch (12 mm to 19 mm) alkali-resistant (AR) glass fiber chopped strands to allow the fibers to distribute evenly without clumping while helping to create a stable, lightweight and crack-resistant planter. Of course that will not happen by itself. Learning and following the steps to ensure safe handling is critical when handling this fiber.The fiber looks to be generally even in length, without a lot of dust in the bag. The strand length should make it fairly easy to mix with the mortar. Given the quality and cost this appear to be a good value.

[Size: 2.2 Lb / 3/4"(19mm), Size: 2.2 Lb / 3/4"(19mm)]
I used this reinforcement fiber for a basement wall repair and a small outdoor slab, and it performed better than the usual additives I’ve tried. Mixing is simple - just blend it with the dry materials and add a little extra time to ensure it disperses. The fibers look like a fine grey powder, but once the concrete cures, they completely disappear. The finished surface came out smoother and more uniform, with none of the spider‑web cracking I typically see in untreated mixes.The quality feels professional, and the alkali‑resistant glass holds up well inside the cement. Durability is where it really stands out. The outdoor slab has already gone through heavy rain and temperature swings, and it still looks tight and solid. The basement patch shows noticeably less porosity, and the waterproofing effect is clear—no seepage, no damp spots. The fibers create a denser matrix that absorbs impact better, and the cured surface has that solid, monolithic feel you usually only get from higher‑grade mixes.Ease of use is excellent, and the dosing guidelines make it easy to avoid waste. Appearance is clean, with no fibers showing through. For value for money, this is one of those additives that earns its keep. It strengthens the mix, reduces cracking, improves waterproofing, and eliminates the need for extra sealers or coatings. Getting multiple performance upgrades from a single additive makes it a smart choice for both small repairs and larger pours, and it’s now something I plan to keep on hand for future projects.

[Size: 2.2 Lb / 3/4"(19mm)]
I used these glass fibers as a reinforcement additive in a cement/mortar mix where I wanted extra crack resistance. The fibers mixed in well when added to the dry material first, and giving the batch a little extra mixing time helped distribute them more evenly before adding water.The 3/4-inch length is a practical size because the fibers are long enough to help reinforce the mix but not so bulky that they are difficult to blend. Once mixed properly, they spread throughout the mortar instead of staying clumped in one area. I did take my time with the mixing because clumps would defeat the purpose of using fiber reinforcement.The finished mix felt a little more cohesive and less brittle than plain mortar. For patching, resurfacing, small concrete work, or areas where fine cracks are a concern, adding fibers is a good extra step. It does not replace proper prep, correct mix ratio, or structural reinforcement where that is required, but it helps improve the toughness of the cement-based material.I also liked that the fibers are alkali-resistant, which matters because cement is a harsh environment. Regular fibers can break down over time, so using a fiber meant for concrete and mortar gives more confidence for exterior work, wet areas, or places exposed to weather.For small projects, the 2.2 lb bag is a useful amount, cost effective, and easy to dose. I would recommend measuring carefully, mixing thoroughly while dry, and then adding water gradually so the fibers stay evenly suspended in the batch. Used correctly, they are a simple way to add extra durability and reduce the chance of hairline cracking.

[Size: 2.2 Lb / 3/4"(19mm), Size: 2.2 Lb / 3/4"(19mm)]
These concrete reinforcement fibers have a clean and uniform appearance. The filaments feature a translucent white color and a lightweight look, forming small clusters that separate easily. At first glance, the fibers appear to have a consistent cut, giving the entire contents a uniform appearance.One of the details that stood out to me most was the consistency of the material. I did not notice excessive dust, visible debris, or significant variations in the size of the fibers. The material has a flexible, lightweight feel, while the overall finish gives a good impression of manufacturing quality.I also appreciated that the product includes safety information and handling recommendations, reminding users to wear appropriate protective equipment and work in a well-ventilated area, which is a thoughtful detail for this type of material.Overall, these fibers stand out for their uniform appearance, clean finish, and consistent overall quality, giving a positive impression from the moment they are examined.

[Size: 2.2 Lb / 3/4"(19mm)]
I ordered this to use as a reinforcement additive in my cement‑based and resin‑based mixes, because glass fibers like these help prevent cracking and improve the overall structural stability of my art pieces. When I integrate them into a substrate, they distribute stress throughout the material instead of letting it concentrate in one weak point, which is what usually causes micro‑fractures in larger or more complex mixed‑media builds. These glass fibers add the tensile strength needed to hold everything together, especially when I’m creating pieces that combine weight, texture, and multiple bonded layers. They blend easily into the mix, don’t clump, and give me a stronger, more resilient base to work from in the shop.I hope you found my review helpful 🤗

[Size: 2.2 Lb / 3/4"(19mm), Size: 2.2 Lb / 3/4"(19mm)]
These glass reinforcement fibers are a useful additive for concrete, mortar, and cement projects where extra durability is needed. Designed to mix directly into the material, they help reinforce the finished surface and can improve overall strength and stability in a variety of applications, including floors, walls, countertops, and repair projects.The alkali-resistant fibers blend easily into concrete and mortar mixes and are a practical choice for DIYers and contractors looking to improve the performance of their cement-based projects. Overall, it's a straightforward product that can be a valuable addition when working on concrete and masonry jobs that require added reinforcement.

[Size: 2.2 Lb / 3/4"(19mm), Size: 2.2 Lb / 3/4"(19mm)]
I like to put medium size water bowls I make from concrete around the yard for birds and the local wildlife. And I've noticed even the neighborhood dogs like them. Over time I've noticed they get small cracks and fissures and this is the right solution to mix with my concrete to resolve that issue.It comes simply packaged, a brown box with the glass fibers inside a plastic bag. The bag opens enough to easily retrieve and weigh what you need to mix in.I'm still waiting for the bowls to cure and the long test over the summer. The fiberglass mixed in great and I noticed there appeared to be less air in the concrete when I shook it. Wish the goal is for the last fibers to fill in air pockets and provide additional strength for the concrete. The shape looks really smooth so far, though I haven't released it from the mold yet. Overall and easy and powerful addition to my concrete shenanigans. Be sure to wear PPE when you mix your concrete as well as when handling fiberglass.