--- product_id: 52415554 title: "Polycraft PU5800 Variable Polyurethane Foam (Soft/Medium/Hard) - 1.4kg Kit" brand: "polycraft ( mb fibreglass )" price: "£50.43" currency: GBP in_stock: true category: "Polycraft ( Mb Fibreglass )" url: https://www.desertcart.co.uk/products/52415554-polycraft-pu5800-variable-polyurethane-foam-soft-medium-hard-1-4kg store_origin: GB region: United Kingdom --- # Easily pigmented for custom finishes Rapid cure & rise time (under 3 mins) Adjustable hardness ratio (Soft/Medium/Hard) Polycraft PU5800 Variable Polyurethane Foam (Soft/Medium/Hard) - 1.4kg Kit **Brand:** polycraft ( mb fibreglass ) **Price:** £50.43 **Availability:** ✅ In Stock ## Summary > ⚡ Shape your space with foam that flexes to your vision! ## Quick Answers - **What is this?** Polycraft PU5800 Variable Polyurethane Foam (Soft/Medium/Hard) - 1.4kg Kit by polycraft ( mb fibreglass ) - **How much does it cost?** £50.43 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/52415554-polycraft-pu5800-variable-polyurethane-foam-soft-medium-hard-1-4kg) ## Best For - polycraft ( mb fibreglass ) enthusiasts ## Why This Product - Trusted polycraft ( mb fibreglass ) brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** Self-skinning, durable foam ensures long-lasting performance in demanding applications. - • **Density on Demand:** Control foam density from 140 to 500 kg/m³ for versatile use cases and superior sound dampening. - • **Tailor Your Texture:** Variable mix ratios let you dial in soft, medium, or hard foam effortlessly. - • **Speed Meets Precision:** Fast cream and rise times mean quicker project turnarounds without sacrificing quality. - • **Custom Colors, No Limits:** Easily pigmented formula lets your creativity shine with bespoke finishes. ## Overview Polycraft PU5800 is a premium two-component polyurethane foam kit offering adjustable hardness from soft to hard via precise mixing ratios. It features rapid curing times, self-skinning durability, and customizable pigmentation, making it ideal for professional-grade moulding, sound dampening, and bespoke foam applications. With density control up to 500 kg/m³, it adapts to diverse project needs while ensuring long-lasting, high-performance results. ## Description Product description Polycraft PU-5800 variable foam is a two component polyurethane foam system, that when mixed gives a medium density soft, medium or hard elastomeric foam. The foam is self-skinning, durable and has excellent physical properties. Typical free rise density is between 140 – 160 kgm-3, however the foam can be over packed in the mould to give higher densities of up to 500 kgm-3. The final hardness of the foam can be adjusted by small adjustments to the mixing ratio. Polycraft Variable Foam can be used at 100:33 by weight for soft foam, 100:36 by weight for medium foam and 100:40 by weight for hard foam, different ratios will produce different foam hardness. For bulk castings using Medium and Hard PU5800, shrinkage of the cured product may be observed. Soft - Mix Ratio By Weight - 100A-33BMedium - Mix Ratio By Weight - 100A-36BHard - Mix Ratio By Weight - 100A-40BCured Colour - Amber / Yellow Cream Time - 30 - 40 SecondsRise Time - 135 - 165 Seconds For best results ensure resins and moulds are at temperature above 25°C before using, using at colder temperatures will effect cured characteristics and may inhibit cure. Ensure moulds are free from dust and other contaminants. Always perform small test before pouring large amounts to ensure suitability. The user must first thoroughly test the foam before going into production. Excessive usage of isocyanate can cause hardening of soft foams over time and may even cause excessive contraction of the moulding. Polycraft foams are moisture sensitive, keep containers closed when not in use. When stored correctly unopened product has a shelf life of 6 months from purchase. Please refer to website for further information regarding usage. Legal Disclaimer Unfortunately we are unable to ship this item to, Isle of Man, Channel Islands or any Scottish Islands. Orders placed for these addresses will be cancelled and refunded due to carrier restrictions. ## Features - Soft, Medium or Hard Foam Can Be Achieved - Flexible - High Durability - Self-Skinning, Durable - Easily Pigmented - Rapid Demould ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01CSWF6KQ | | Batteries Required? | No | | Batteries included? | No | | Best Sellers Rank | 827,697 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 2,741 in Sculpting Moulding & Casting | | Customer Reviews | 5.0 5.0 out of 5 stars (2) | | Date First Available | 10 Mar. 2016 | | Manufacturer | Polycraft ( MB Fibreglass ) | ## Images ![Polycraft PU5800 Variable Polyurethane Foam (Soft/Medium/Hard) - 1.4kg Kit - Image 1](https://m.media-amazon.com/images/I/71iN6MpbXVL.jpg) --- ## 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.co.uk/products/52415554-polycraft-pu5800-variable-polyurethane-foam-soft-medium-hard-1-4kg](https://www.desertcart.co.uk/products/52415554-polycraft-pu5800-variable-polyurethane-foam-soft-medium-hard-1-4kg) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-29*