What is Polyurethane PU Foam Spray? Guide to Insulation

Polyurethane (PU) foam spray is a versatile and powerful insulation material widely used in construction, renovation, and industrial sealing applications. This expanding foam comes in an aerosol can or a spray gun. It quickly fills gaps, cracks, and holes. This foam creates an airtight seal that is water-resistant and helps save energy.

Whether you’re sealing window and door frames, filling wall cavities, or protecting building joints, **polyurethane PU foam spray** is a go-to solution for professionals and DIY users alike.

PU foam is a single-component, moisture-cured polyurethane resin. When it comes out of the can, it reacts with moisture in the air. It expands and then hardens into a firm, semi-flexible foam.

It bonds well to many building materials like concrete, brick, wood, metal, and plastic. However, it does not bond to Teflon, silicone, and polyethylene.

Building Insulation: Widely used in roofs, attics, walls, foundations, basements, and floors to improve energy efficiency and comfort.

Sealing Gaps and Cracks: Ideal for sealing connection joints around window and door frames, pipe entries, air conditioning vents, and filling large cavities.

Soundproofing: Used to reduce noise transmission in walls and other structures.

Filling and Bonding: Can be used for fixing, filling, and providing structural reinforcement.

Specialized Applications: Also found in vehicle bodies, container insulation, boats, and even for custom packaging of fragile items.

PU foam spray is commonly used in:

Window & door installation — to fill gaps and prevent drafts

HVAC systems — sealing ductwork and pipes

Wall & roof insulation — improving energy efficiency

Soundproofing — reducing noise transmission

General construction — sealing wall penetrations, expansion joints, etc.

Contractors and builders can use OEM PU foam spray with private labels. This helps them provide customized solutions under their own brand.

The two liquid components are mixed at the tip of a spray gun. Upon exiting the nozzle, they react rapidly and expand significantly (often 30-60 times their original liquid volume) to form a cellular plastic foam. This foam then hardens, creating a rigid or semi-rigid structure.

Both single-component (curing with ambient moisture) and two-component (curing through a chemical reaction within the canister or at application) foams are available, each with specific application requirements and properties.

In high-risk areas like kitchens, utility rooms, and public buildings, fire resistance is a major concern. That’s why fire proof spray for PU foam has become an essential product in the safety-first construction industry. These fire-retardant PU foams are designed to:

Comply with international fire safety standards (e.g., DIN 4102, B1/B2)

Resist flames and slow down fire propagation

Maintain insulation performance under high temperatures

For projects requiring strict fire safety compliance, choosing fire proof PU foam spray is a must.

If you’re a wholesaler, contractor, or brand owner, OEM PU foam spray is a smart business choice. OEM manufacturers offer:

Custom can designs (size, valve, cap type)

Personalized branding and packaging

Tailored formulas (low expansion, high expansion, fire rated, etc.)

Global shipping and compliance certifications

This allows you to build your own product line of PU foam sprays without investing in production facilities.

Donyan Polyurethane Foam A2

Polyurethane Foam pu foam A2

 

• High Hardness
• Easy & Convenient

分类： espuma de poliuretano

Polyurethane PU foam spray is great for sealing gaps, insulating buildings, and providing fire resistance. It offers excellent performance and versatility. OEM PU foam spray gives distributors and brand owners the chance to build their own brand. It also offers high-quality, customizable products.

If you need high-quality PU foam, choose a trusted manufacturer. Look for one with experience in fire-resistant products and OEM skills. Dongyuan Technology Co., Ltd. will be your wise choice. Quality foam means safer, more efficient buildings — and satisfied clients.

As a globally recognized leader in polyurethane foam manufacturing, With over 30 years of expertise, we pride ourselves on being the trusted partner for businesses seeking superior quality, innovation, and flexibility.
Our polyurethane foams are industry standards, offering unmatched durability, thermal insulation, and load-bearing capabilities.

Whether your needs span furniture, automotive interiors, construction, or specialized industrial applications, Donyan’s foams adapt seamlessly to your unique requirements.