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Best Polyurethane Foams

Discover high-quality polyurethane foams for sealing gaps, insulation, and industrial applications. Ideal for construction, HVAC, and manufacturing needs.

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ZOCONE 4PCS High-Density PU Foam Sheets: 2x 16x12x2in + 2x 16x12x0.4in Black Inserts for Tool Box, Cases, Camera Storage

This ZOCONE set provides 2 pieces of 16x12x2-inch thick foam mats and 2 pieces of 16x12x0.4-inch spacers made from high-density polyurethane for custom case padding. Its standout resilience and impact absorption protect tools, cameras, and electronics in toolboxes or storage cases, ideal for DIY organizers needing durable, cuttable foam.

  • Layered design with thick mats and thin spacers for full bottom-to-side protection
  • Superior resilience rebounds instantly for ongoing stable support
  • Excellent shock absorption shields valuables from impacts and bumps
  • Effortlessly cut to custom shapes for snug, movement-free fits
  • Versatile for toolboxes, camera cases, game boxes, and electronics storage

High-density material offers top-tier cushioning and durability. Simple to cut and shape without special tools or skills. Perfect fit enhances protection and organization.

Foam needs a few minutes to fully expand and rebound from packaging. Available only in black color. Requires basic tools like a knife for cutting.

3M Fire Block Foam FB-Foam 12oz: Fire-Resistant Expanding Sealant for Construction Voids & Penetrations

3M Fire Block Foam FB-Foam is a ready-to-use polyurethane foam designed to seal, fill, insulate, and bond voids in non-rated residential and commercial construction. Its standout quality is expanding up to 200% while resisting flames, heat up to 240°F, and air infiltration, making it ideal for contractors handling penetrations around wires, pipes, and cables.

  • Blocks fire, smoke, and air movement in wall, floor, and ceiling cavities for enhanced safety
  • Expands up to 200% to quickly seal gaps around pipes, wires, and cables without mixing
  • Heat-resistant up to 240°F with minimal shrinkage for long-lasting performance
  • Tested as Type V fireblock per ASTM E84, complying with IBC and IRC codes
  • Provides R-value insulation of 4-5 per inch to reduce drafts and improve energy efficiency

Ready-to-use with no mixing required for fast application. Excellent multi-surface adhesion for versatile use in construction. High expansion and insulation properties seal voids effectively.

Intended for industrial/occupational use only, not consumer applications. Significant expansion requires precise dispensing to avoid overfill. Orange color may be visible in finished spaces.

OBQSNS 2-Pack High-Density Polyurethane Foam Sheets 15.5x11.5x1 Inch - Cuttable Inserts for Toolboxes, Camera Cases, Crafts & Packing Pads

These 2-pack polyurethane foam sheets, each 15.5x11.5x1 inches, provide high-density cushioning for protecting valuables like cameras and tools during storage or transport. Ideal for DIY crafters, packers, and toolbox organizers needing customizable padding.

  • Superior shock absorption safeguards fragile electronics, kitchenware, and tools from impacts and scratches
  • Effortlessly cut and shape to create perfect custom fits for cases, drawers, and shipping boxes
  • Versatile for protective packaging, DIY crafts, model making, and home decorations
  • High-density construction delivers lasting elasticity and softness for repeated use
  • Convenient 2-sheet pack provides ample material for multiple projects or replacements

Excellent cushioning and rebound for reliable protection. Simple to trim with scissors or knife for precise customization. Multi-use across storage, transport, and creative applications.

May arrive wrinkled or creased, requiring water soak and drying to restore. Restoration process adds prep time before first use.

Tioncy 12 Pack 16x12x1 Inch Polyurethane Foam Sheets - Cuttable Inserts for Toolboxes, Camera Cases, Crafts & Storage Protection

This 12-pack of 16x12x1-inch polyurethane foam sheets from Tioncy offers high-density, cuttable pads for custom toolbox inserts and protective packaging. Their elastic, shock-absorbing material excels at safeguarding cameras, electronics, and fragile items, making them ideal for DIY packagers and crafters.

  • Generous 12-pack quantity covers multiple DIY projects, eliminating frequent repurchases
  • High-density foam delivers superior shock absorption and drop resistance for valuables
  • Effortlessly cuttable to custom shapes for precise fits in toolboxes and cases
  • 1-inch thickness provides robust cushioning for cameras, tablets, and electronics
  • Versatile for crafts, storage, and packaging fragile items like glasses and utensils

Ample supply and large size for versatile use. Soft, elastic material ensures reliable protection. Easy customization for personalized storage solutions.

Arrives vacuum-compressed, requiring a day to fully expand. Slight size variations possible from manual measurement. Color may differ slightly from screen displays.

FENYUAN 2-Pack 16x12x1 Inch White Polyethylene Foam Padding - Soft Cuttable Inserts for Cases, Tools, Electronics & Packaging

FENYUAN's 2-pack 16x12x1 inch white polyethylene foam sheets provide premium shock-absorbing cushioning that expands quickly when unpacked or lightly wetted. DIY enthusiasts and packers should buy them for custom case inserts protecting tools, electronics, and collectibles.

  • Expands rapidly to full 1-inch thickness for instant protection after unpacking
  • Absorbs shocks and vibrations to safeguard tools, electronics, and valuables during transport
  • Cuts precisely with a knife or tears easily by hand for perfect custom fits
  • Lightweight and durable for reliable cushioning in cases, toolboxes, and packaging
  • Versatile for DIY projects, crafts, furniture padding, and automotive use

Quick expansion with optional wetting speeds up setup. Superior impact absorption protects fragile items effectively. Highly customizable for precise case and toolbox inserts.

Arrives compressed, requiring time or moisture to fully expand. White color may show dirt over time with heavy use. Hand-tearing can lead to less precise edges than cutting.

Fiberglass Supply Depot 8 lb Density Expanding Polyurethane Pour Foam Gallon Kit - High-Strength Structural Fill & Reinforcement

This Fiberglass Supply Depot 8 lb density polyurethane pour foam gallon kit (Part A and B) delivers very high compressive strength and rigidity for structural reinforcement and void filling. Boat builders and industrial users should buy it for load-bearing applications with excellent water resistance.

  • Achieves superior structural rigidity for high-load areas like transoms and industrial cores
  • Provides very high compressive strength to support demanding reinforcement needs
  • Offers excellent water resistance with closed-cell structure for durable performance
  • Easily mixes 1:1 and pours to expand precisely into voids without mess
  • Versatile cured foam cuts, sands, drills, paints, or fiberglasses for custom finishes

Very high density ensures structural grade strength and rigidity. Closed-cell design excels in water resistance. Simple equal-part mixing for straightforward application.

Lower expansion rate yields less volume per kit. Limited suitability for flotation due to high density. Requires accurate mixing for optimal curing.

TotalBoat 2lb Flotation Foam: 2-Part Expanding Polyurethane Pour Foam Kit for Boat Buoyancy, Insulation & Soundproofing (2 Quart)

TotalBoat Flotation Foam is a 2-part polyurethane expanding pour foam that adds buoyancy, insulation, and soundproofing to boats, kayaks, and pontoons. Its US Coast Guard compliant closed-cell structure resists water absorption, making it perfect for marine DIYers and shipwrights filling hull voids or decks.

  • Boosts boat buoyancy to stay afloat even if hull is damaged
  • Provides superior thermal insulation and soundproofing for quieter, comfortable rides
  • Fills hard-to-reach voids and gaps with 20x expansion for even coverage
  • Resists water, fuel, solvents, and impact without adding weight
  • Easy 1:1 mix ratio for quick hand or drill application

94% closed-cell structure prevents waterlogging and maintains long-term flotation. Versatile for boats, RVs, aircraft, and artistic projects. Rapid cure in 5-20 minutes with minimal shrinkage.

Requires 75-85°F temperatures for optimal expansion and performance. Fast-setting nature demands quick mixing and pouring preparation. Non-structural only; not suitable for load-bearing applications.

Pangda 2-Pack Anti-Static Black Polyurethane Foam Sheets 12x12x0.25in - Cuttable High-Density Pads for Electronics, Tools, Crafts & Storage

Pangda offers two 12x12x0.25-inch black polyurethane foam sheets that are cuttable, high-density, and anti-static for shock absorption. Buy these for protecting electronics, cameras, tools, or crafts during packing and storage.

  • Safeguards electronics and valuables from static damage and shocks during transit
  • Custom-cut to fit any shape for perfect protection in cases or toolboxes
  • High-density cushioning absorbs vibrations to prevent breakage
  • Versatile for packing cameras, crafts, glassware, jewelry, and auto parts
  • Sleek black design enhances storage aesthetics without compromising function

Effective anti-static protection for sensitive electronics. Easily cuttable for custom-fit applications. Durable high-density foam with excellent shock absorption.

Thin 0.25-inch profile may need layering for heavier items. Slight size variations possible from manual measurement. Color appearance can differ slightly by display screen.

Foamma Custom Cut-to-Size Charcoal Upholstery Foam - High/Medium Density Polyurethane Cushions for Chairs, Couches, DIY Projects

Foamma Custom Cut-to-Size Foam is high and medium density polyurethane perfect for replacing cushions in chairs, couches, and DIY projects. Its 1.8 density with 44-46 lb compression and 100% recovery delivers durable support for high-traffic areas.

  • Tailored fit for any project with custom cuts up to 109x84 inches and 1-12 inch thickness
  • Durable polyurethane holds shape through daily use with 100% recovery after compression
  • Choose mid-firm or firm density for balanced softness and lasting support
  • Versatile for couches, chairs, boats, RVs, crafts, and protective padding
  • Made and cut in USA for consistent quality without third-party reselling

Highly customizable dimensions and densities for perfect project fit. Long-lasting performance in high-traffic furniture and vehicles. Premium USA-made quality with flexible applications.

Requires up to 72 hours to fully expand after unpacking. Slight size variations of 0.25-1 inch possible. 50% restocking fee applies to returns.

Amylove High Density Polyurethane Upholstery Foam Sheet 1/2" x 24" x 72" Gray - Cushion Replacement for Chairs Sofas Headboards DIY

This Amylove high-density polyurethane foam sheet measures 1/2 x 24 x 72 inches in gray, designed as closed-cell material for durable cushion replacements. Its resilience allows quick recovery from compression, making it ideal for DIYers restoring seats, chairs, sofas, or headboards.

  • Easily cut into custom shapes for perfect fit in DIY upholstery projects
  • High-density closed-cell structure resists deformation for years of reliable use
  • Soft, comfortable surface enhances seating on chairs, sofas, and headboards
  • Versatile for cushion replacements and protective padding on fragile items
  • Quickly rebounds to fluffy state after compression for lasting comfort

Durable quality PU material holds shape over time. Convenient size ideal for cutting to various needs. High resilience provides satisfying bounce-back.

Arrives vacuum-packed with possible shrinkage; requires gentle patting to fluff. Thin 1/2-inch profile suits lighter cushions best. Sensitive to direct sunlight, needs careful storage.

Whether you're tackling construction projects, HVAC installations, or manufacturing tasks, polyurethane foams are indispensable for sealing gaps, providing insulation, and ensuring airtight bonds. In this category under Raw Materials, you'll find reliable options like Red Devil's expanding spray foams for small and large gaps, and 3M's specialized fire block foam, all designed for professional-grade performance in industrial and scientific applications.

Understanding Polyurethane Foams

Polyurethane foams are versatile, expanding materials that cure into a durable, adhesive sealant. They start as a liquid dispensed from a can, then expand to fill voids, conform to irregular surfaces, and harden into a semi-rigid structure. These foams excel in applications requiring thermal insulation, soundproofing, and vibration dampening, making them a staple in the Industrial & Scientific sector.

Key benefits include moisture resistance, low conductivity for energy efficiency, and strong adhesion to most surfaces like wood, metal, concrete, and plastics. Unlike traditional fillers, polyurethane foams create a monolithic seal that prevents air leaks, drafts, and pest intrusion, saving time and costs on long-term repairs.

Key Features to Consider When Buying

Selecting the right polyurethane foam depends on your project's demands. Here are essential factors:

  • Expansion Ratio: Low-expansion foams (like those for small gaps) minimize overfill, while high-expansion suits larger voids.
  • Cure Time: Tack-free in minutes to hours; full cure in 24 hours for sanding or painting.
  • Fire Rating: Standard foams are flammable, but fire-retardant versions meet building codes for critical areas.
  • Color and Finish: Off-white or orange tints for visibility; paintable for aesthetics.
  • Can Size and Yield: 12 oz cans typically yield 20-30 linear feet, depending on bead size.

Also evaluate temperature range (-40°F to 240°F post-cure), UV stability for exterior use, and compatibility with Plastics or Metals & Alloys in assemblies.

Common Use Cases

These foams shine in diverse scenarios:

  • Construction and Remodeling: Seal around windows, doors, pipes, and rim joists to boost energy efficiency.
  • HVAC and Plumbing: Insulate ducts, secure refrigerant lines, and fill penetrations.
  • Manufacturing: Bond components, dampen vibrations in machinery, or create gaskets.
  • Fire Safety: Block drafts in firewalls or penetrations to slow flame spread.

For adhesive-heavy projects, pair with Foam Adhesives. In composite work, they complement Laminates & Composites.

Top Products in Polyurethane Foams

RedDevil stands out with trusted spray foams. The Red Devil 0913 is ideal for small gaps and cracks, offering precise application without excessive expansion. For bigger voids, the Red Devil 0909 provides robust filling power. Explore more from RedDevil or their dedicated RedDevil Polyurethane Foams.

3MIndustrial's Fire Block Foam brings specialized protection with its orange color and ready-to-use formula, perfect for in-place firestopping. Learn about their innovations at the 3MIndustrial brand page.

How to Choose Between Models

Compare based on gap size: Use 0913 for cracks under 1 inch, 0909 for wider areas, and 3M FB-Foam where fire resistance is paramount. All feature low-odor, one-component dispensing for ease, but match to your substrate and environmental needs for optimal results.

Frequently Asked Questions

What is the difference between low-expansion and high-expansion polyurethane foam?

Low-expansion foams, like those for small gaps, grow minimally to avoid structural pressure, ideal for precise sealing. High-expansion versions fill large voids quickly but require careful dosing.

Are polyurethane foams paintable?

Yes, most cure to a paintable surface within 24 hours. Prime first for best adhesion, especially on off-white foams.

Can these foams be used outdoors?

Many are UV-stabilized, but for prolonged exposure, choose weather-resistant grades or protect with paint to prevent degradation.

Do they work on wet surfaces?

Polyurethane foams react with moisture to expand, so they perform well on damp surfaces but avoid standing water for full cure.

How do I remove uncured foam?

Wipe with acetone or manufacturer-recommended cleaner immediately; cured foam requires mechanical removal or solvents.

Related Categories
Metals & Alloys 188 Plastics 144 Wire Meshes 36 Foam Adhesives 35 Laminates & Composites 31 Shims & Shim Stock 30