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Exhaust air purification in resin processing – safe removal of styrene, MMA, and VOCs

The processing of polyester, epoxy, or acrylic resins produces strong-smelling, harmful, and in some cases explosive emissions—primarily styrene, methyl methacrylate (MMA), aldehydes, VOC mixtures, and microparticles. These emissions occur during mixing, application, lamination, curing, and tempering—especially in open or semi-closed processes.

oxytec offers customized exhaust air purification systems that enable you to reliably comply with VOC limits, protect employees and the environment, and meet regulatory requirements.

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Typical VOC sources in resin processing

Process Typical VOCs / emissions Special features
Mixing and dosing Styrene, MMA, peroxides, resin monomers Release through open containers, stirring, heat
Laminating / manual application Styrene, epoxy resin vapors Large areas, slow evaporation, long exposure time
Vacuum infusion / RTM VOCs due to leaks, styrene Emissions during venting / demolding
Curing / oven processes Formaldehyde, acetaldehyde, methacrylate VOCs due to temperature increase or after-reactions
Grinding/post-processing Dust, resin particles, reactive substances Mechanical stress on the cured matrix

Why is exhaust air purification essential in resin processing?

  • Styrene irritates mucous membranes, damages nerves, and has an extremely noticeable odor.
  • MMA and other VOCs are flammable and some are explosive (ATEX-relevant).
  • Aldehydes such as formaldehyde are classified as carcinogenic
  • Emissions protection requirements according to TA Luft, 31. BImSchV, and the VOC Directive (2010/75/EU) require technical reduction

oxytec systems help you to meet these requirements in an economical, efficient, and approval-compliant manner.

Legal requirements

  • TA Luft 2021: Compliance with VOC limits and styrene emissions
  • 31st BImSchV: Limitation of solvent emissions depending on the quantity used
  • VOC Directive (2010/75/EU): Requirements for diffuse and point VOC sources
  • ATEX directives: for flammable resin vapors or explosive atmospheres

oxytec supports you in the proper design and documentation for approvals.

Get advice now – clean air during resin processing

Do you want to safely control VOC emissions and operate your processes in compliance with the law?

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Exhaust air purification technologies for GRP, CFRP, and resin applications

UV ozone systems

Photochemical oxidation of VOCs, in particular styrene, MMA, and aldehydes.

Advantages:

  • Compact design
  • No residues
  • Effective against odors and germs

activated carbon filter

Adsorption of highly volatile VOCs such as styrene or methacrylate – as a standalone or downstream purification stage.

Advantages:
Proven technology
Flexible application
Also available as a mobile solution

KAT Industrie

Aktivkohlefilter als Speicher­reaktor zur Luft­nachbehandlung

Scrubbers or electrostatic precipitators

For special processes, such as combined dust/steam emissions, can be supplemented by scrubber or heat recovery

Clean Washer Air

Gegenstromwäscher zur Beseitigung von Geruch und Partikeln

Other areas of application

  • GRP/CFRP manufacturing (e.g., in boat, vehicle, container, or rotor construction)
    Sanitary and bathtub production
  • Linoleum manufacturing
  • Resin-impregnated building components (e.g., fiberglass mats)
  • Wind energy (rotor blade manufacturing)
  • Model and tool making
  • Epoxy and acrylic resin foundries

Your advantages with oxytec

  • Effective VOC reduction, including styrene and MMA
  • Systems for continuous operation or batch processes
  • Compact, energy-efficient, and retrofittable
  • Individual planning, delivery, and maintenance
  • Support with expert reports, measurements, and subsidies

FAQ – Frequently Asked Questions

Which VOCs typically arise during resin processing?

The processing of reaction resins produces the following volatile organic compounds (VOCs), among others:

  • Styrene – from unsaturated polyester and vinyl ester resins
  • Methyl methacrylate (MMA) – from acrylic resins
  • Formaldehyde, acetaldehyde – during thermal decomposition
  • Alcohols, ketones, peroxides – from additives and cleaning agents
    These substances are often irritating, have a strong odor, or are even carcinogenic, and are subject to legal limits.

Why is styrene particularly critical?

Styrene is a colorless, highly volatile solvent with an intense odor. It is considered:

  • irritating to the skin, eyes, and respiratory tract
  • neurotoxic in case of prolonged exposure
  • potentially carcinogenic (IARC Group 2B)
  • highly flammable – ATEX-relevant

In addition, styrene has an extremely low odor threshold, which means that even small amounts can cause discomfort.

When is exhaust air purification required by law?

Exhaust air purification is required if:

  • VOC limits according to TA Luft or 31. BImSchV are exceeded
  • Styrene emissions are relevant (e.g., in GRP processing)
  • the system is subject to approval (BImSchG)
  • There are odors or safety risks (e.g., ATEX)
    In many cases, authorities require a technical solution even for smaller systems—especially for open processes.

Which technologies are suitable for exhaust air purification in resin processing?

Depending on the process, substances, and air volume, the following options are available:

  • UV ozone systems → break down VOCs such as styrene, MMA, formaldehyde
  • Activated carbon filters → adsorb remaining VOCs, including odor-intensive ones
  • Scrubbers (optional) → for humid air or condensing substances
    Oxytec offers combined solutions that are optimally tailored to the process and emissions.

How much space is required for exhaust air purification?

Our systems are compact in design – e.g. as:

  • Inline device in the exhaust air duct
  • Compact unit in the technical room or next to the workplace
  • Container solution for outdoor installation
    The actual space required depends on the air volume and the selected technology – we plan individually.

How energy-intensive is VOC exhaust air purification?

Compared to thermal post-combustion, UV ozone and activated carbon systems are significantly more energy-efficient.
The only costs incurred are for electricity for lamps, fans, and any pressure losses—usually well below 1 kWh per 1000 m³ of air.

How often do the systems need to be serviced?

UV systems: Cleaning and lamp replacement approx. once a year.

Activated carbon filters: Replacement depending on load – usually every 6–12 months.

On request, we offer maintenance contracts with remote monitoring and fault reporting systems.

Can I retrofit my existing GRP or resin system?

Yes—our systems are modular in design and can be integrated into existing facilities.
Whether you need an open workbench, cabin, dryer, or complete hall ventilation system, we tailor the solution to your specific requirements without disrupting ongoing processes.

Are there subsidies for exhaust air purification in resin processing?

Yes, there are federal and state funding programs for:

  • Emissions reduction (e.g., VOC reduction)
  • Energy efficiency in industrial processes
  • Technical exhaust air treatment within the framework of the Federal Immission Control Act (BImSchG)
    Oxytec supports you in researching subsidies and submitting applications.