EN720 Non-Hazardous Polyurethane Flushing Agent — Methylene Chloride Alternative

A powerful, solvent-free polyurethane flushing agent that replaces methylene chloride (DCM) — safer to handle, recyclable, and proven to deliver a better clean.

• Non-hazardous and solvent-free — no dangerous vapours or extreme handling precautions
• Proven methylene chloride (DCM) replacement — matches cleaning performance and exceeds it!
• Recyclable formula — get 6–9 flushes per litre vs single-use DCM
• Uses one-third to one-half the volume of DCM for the same job
• Reduces air pressure needed during flushing — can be left in pipes and mixer heads to react
• Available in 25L and 200L drums for workshop and industrial-scale use

About EN720 Polyurethane Flushing Agent

For many years, manufacturers have used Methylene Chloride as a polyurethane (PU) flushing agent. It has a tried, tested and proven track record, but it’s also very dangerous, so responsible companies are now looking for alternatives. EN720 is a non-hazardous, solvent-free polyurethane flushing compound that clears uncured polyurethane residue from machines without using dangerous solvents.

EN720 was developed to fill that gap. It delivers the powerful cleaning ability of methylene chloride without any of the extreme hazards, making it the first genuinely practical non-hazardous polyurethane flushing compound on the market. EN720 is solvent-free, non-flammable and safe to handle by operators without the extreme precautions required when working with DCM.

Supplied in 25L and 200L drums, EN720 is suitable for both workshop-scale and large industrial polyurethane processing operations.

How EN720 Works

EN720 is formulated to break down the curing process of polyurethane, preventing uncured PU from bonding to the walls of pipes, mixer heads and processing equipment. Unlike DCM — which relies on being pushed through equipment under air pressure to create friction and scrub residue — EN720 is a reactive cleaner that actively seeks out and dissolves uncured PU on contact.

EN720 is a very searching cleaner. What we mean by that is that it actively seeks out a substance to react with and dissolve. Unlike DCM, which relies on air pressure to push the cleaner and create scrubbing friction, EN720 needs a much slower flow, since it wants contact time with the material in order to react and dissolve. As a result, you can reduce air pressure during flushing, and you can even leave EN720 within the pipes and mixer heads to react.

Because EN720 is non-hazardous, it can also be safely collected and recycled after use — delivering 6–9 flushes per litre compared to single-use DCM, significantly improving cost-in-use.

Key Benefits of EN720 vs Methylene Chloride

Non-hazardous and safe to handle

EN720 comes in either 25 or 200L drums. Because the product is non-hazardous, operators can handle it safely without risk of harm — unlike Methylene Chloride, which requires extreme precautions to avoid spills or vapour release.

Recyclable — dramatically lower cost in use

As a result of its slower, more targeted action, users commonly find they need only a third to half the amount of DCM they previously used.

Because EN720 is non-hazardous, you can also recycle it easily and safely. This means you get 6–9 flushes per litre compared to DCM, providing excellent cost-in-use.

EN720 costs more than Methylene Chloride upfront; however, the ability to recycle and reuse it means the cost difference becomes minimal. What’s more, customers report that EN720 delivers a much better cleaning result than DCM.

Superior cleaning performance

Customers consistently report that EN720 provides a better cleaning result than DCM. Its reactive chemistry actively dissolves uncured polyurethane bonds rather than relying on pressure and friction, meaning it reaches areas that DCM can miss and leaves equipment cleaner between production runs.

Reduced air pressure requirements

Because EN720 works through chemical reaction rather than mechanical scrubbing, operators can reduce air pressure during the flushing process. The compound can also be left within pipes and mixer heads to dwell and react, further reducing the effort required to achieve a thorough clean.

Easy, safe disposal and recycling

EN720 does not require specialist hazardous waste disposal arrangements. Used product can be safely collected for recycling and reuse, reducing waste and lowering the total cost of your flushing operation.

How to Use EN720 Polyurethane Flushing Agent

Standard machine flushing

1. Reduce air pressure below your normal DCM flushing pressure — EN720 does not rely on high-pressure friction to clean.
2. Introduce EN720 into the system at a slow, controlled flow rate to maximise contact time with uncured PU residue.
3. Allow EN720 to dwell within pipes and mixer heads as needed — the compound will continue to react and dissolve PU bonds during the dwell period.
4. Flush through and collect the used EN720 for recycling. A single litre of EN720 can typically be reused for 6–9 flushes before disposal.

Tips for best results

• Do not rush the flow rate — EN720 needs contact time to react, unlike DCM which relies on pressure and speed.
• For stubborn residue, leave EN720 in the system for an extended dwell period before flushing through.
• Collect used EN720 after each flush for recycling — do not discard after a single use.
• Store in original drums with lids secured in a cool, dry location.

Compatible Applications and Industries

EN720 is suitable for flushing polyurethane residue from equipment used across a wide range of industries, including:

• Polyurethane foam manufacturing and processing
• PU sealant and adhesive dispensing equipment
• Spray foam insulation rigs
• Reaction injection moulding (RIM) machines
• PU coating and casting systems
• Mixer heads, static mixers and dispensing nozzles
• Pipes, hoses and feed lines carrying uncured polyurethane

Product Specifications

• Hazard classification: Non-hazardous
• Solvent content: Solvent-free
• Flammability: Non-flammable
• Application: Wet / uncured polyurethane residue removal
• Recyclable: Yes — 6–9 flushes per litre
• Available pack sizes: 25L drum, 200L drum
• Disposal: No specialist hazardous waste arrangements required

Switching from Methylene Chloride to EN720

Since methylene chloride was prohibited as a cleaning agent, polyurethane processors have faced a difficult choice between compromised cleaning performance and continued use of hazardous alternatives. EN720 resolves that dilemma. It is the only non-hazardous polyurethane flushing agent that matches and exceeds the cleaning performance of DCM, while offering significant advantages in safety, recyclability and total cost of ownership.

While EN720 has a higher unit price than methylene chloride, customers consistently find that the ability to recycle and reuse the product — combined with the lower volumes required per flush — means the total cost difference is minimal. Many operations find EN720 more cost-effective over a production period once recycling is factored in.

Available in 25L and 200L drums to suit both smaller workshop operations and large-scale industrial production lines. Contact us to discuss your specific flushing requirements or to request a sample.