--- product_id: 527544813 title: "Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb" brand: "uptthow" price: "¥15004" currency: JPY in_stock: true category: "Uptthow" url: https://www.desertcart.jp/products/527544813-fiberglass-for-cement-mortar-concrete-reinforcement-19mm-4lb store_origin: JP region: Japan --- # Waterproof & impermeable matrix 4lb per bag for optimal mix 19mm high-strength fibers Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb **Brand:** uptthow **Price:** ¥15004 **Availability:** ✅ In Stock ## Summary > 🧱 Reinforce your build, resist the cracks—because your project deserves the best! ## Quick Answers - **What is this?** Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb by uptthow - **How much does it cost?** ¥15004 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/527544813-fiberglass-for-cement-mortar-concrete-reinforcement-19mm-4lb) ## Best For - uptthow enthusiasts ## Why This Product - Trusted uptthow brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Crackproof Confidence:** Fiberglass fibers weave a resilient net that drastically reduces fine cracks, ensuring long-lasting mortar integrity. - • **Water-Resistant Wonder:** Boosts cement density to create a waterproof barrier—perfect for basements, exterior walls, and wet environments. - • **Impact & Seismic Shield:** High-strength fiber filaments form a dense mesh that enhances impact resistance and seismic durability. - • **Easy Integration, Superior Results:** Simply mix fiberglass with sand and cement, then stir 30-60 seconds longer for a flawless, reinforced mortar blend. - • **Precision Dosage for Peak Performance:** Use 1 lb per cubic yard for standard strength or increase dosage in high-impact or freeze-thaw zones. ## Overview UPTTHOW's 19mm fiberglass reinforcement (4lb bag) is engineered to enhance mortar toughness by preventing cracks, increasing waterproofing, and boosting impact resistance. Ideal for residential and demanding environments, it integrates seamlessly into cement mixes to deliver durable, long-lasting construction results. ## Description Please note that 4lb are packed in one bag ## Features - Anti-cracking: Mixing fiberglass and mortar together, the irregular distribution of fiberglass in the mortar enhances the toughness of mortar, and inhibits the formation of fine cracks - Waterproof and Impermeable: A large number of fiber filaments increase the density of cement, which can effectively solve the problem of penetration. It is very suitable for wet place such as basements, pond, Exterior wall - Impact Resistance: High-strength fiber filaments are attached to each other as a dense net to hold the cement tightly. It can effectively enhance the impact and seismic performance of cement - How to Use: Evenly mix sand, cement and fiberglass together, then add an appropriate amount of water, and finally stir (the stiring time is 30-60 seconds longer than without fiberglass) - Dosage: Use 1 lb. (1 pkg) per cubic yard (27 cubic feet) of concrete. You can add a little more in the area with strong impact or severe freeze-thaw ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BX8P982L | | Best Sellers Rank | #60,046 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #14 in Mortar Mix | | Brand | UPTTHOW | | Brand Name | UPTTHOW | | Color | White | | Customer Reviews | 4.6 out of 5 stars 393 Reviews | | Grade Rating | Residential | | Item Diameter | 0.75 inches | | Item Dimensions | 15.75 x 11.81 x 2 inches | | Item Form | Fiber | | Item Highlight | 6/9/19mm length options, 1/2/4 lb weight options, for anti-seepage and anti-cracking cement mix for building walls garden | | Item Shape | Honeycomb | | Item Thickness | 2 inches | | Item Weight | 4 pounds | | Item dimensions L x W x H | 15.75 x 11.81 x 2 inches | | Manufacturer | UPTTHOW | | Material | fiberglass | | Model Number | JIN-Fiberglass 19mm-4lb | | Number of Items | 4 | | Number of Packs | 1 | | Part Number | JIN-Fiberglass 19mm-4lb | | Shape | Honeycomb | | Unit Count | 64 Ounce | ## Product Details - **Brand:** UPTTHOW - **Color:** White - **Item dimensions L x W x H:** 15.75 x 11.81 x 2 inches - **Material:** fiberglass - **Shape:** Honeycomb ## Images ![Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb - Image 1](https://m.media-amazon.com/images/I/715nRghGIDL.jpg) ![Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb - Image 2](https://m.media-amazon.com/images/I/81XOIowNKOL.jpg) ![Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb - Image 3](https://m.media-amazon.com/images/I/81eubYW9sXL.jpg) ![Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb - Image 4](https://m.media-amazon.com/images/I/81HCtLzu8UL.jpg) ![Fiberglass for Cement Mortar Concrete Reinforcement (19MM)-4lb - Image 5](https://m.media-amazon.com/images/I/91vaUr-2FKL.jpg) ## Available Options This product comes in different **Size, Item Package Quantity** options. ## Frequently Bought Together - UPTTHOW Fiberglass for Cement Mortar Concrete Reinforcement Anti-seepage and Anti-cracking Cement Mix for Building Walls Garden Floor 3/4"(19MM)-1lb/PACK - Alpha Pro Fluidizer 1 lb - Dry superplasticizer for Any Concrete Countertop Mix - SIKA - SikaLatex R - Concrete Adhesive Glue, White - Admix for Portland-Cement Mortar/Concrete - Resistant to Freezing and thawing Damage - 1-Gallon --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/527544813-fiberglass-for-cement-mortar-concrete-reinforcement-19mm-4lb](https://www.desertcart.jp/products/527544813-fiberglass-for-cement-mortar-concrete-reinforcement-19mm-4lb) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-10-10*