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Silicone emulsions are constructed to conform with the most stringent worldwide VOC regulations without needing any modifications or additional design efforts. As an example, the EU has REACH regulations that place severe restrictions on the amounts of cyclic siloxanes D4 to D6 at under 0.1%. The majority of compliant silicone emulsions report values around 0.05 to 0.08% which is much better than the specifications. Considering the US, compliant products tested per US EPA Method 24 for VOC content within building paints and coatings are released in the range of 12 to 18 g/L. This is well under the regulatory limit of 50 g/L. The situation is favorable for compliant silicone emulsions in China. In the case of GB 18582-2020, the maximum formaldehyde equivalents of 80 µg/m3 are set for indoors and outside the compliant silicone emulsions in practice are tested at 25 to 40 µg/m3 which is far better than the limit.
Overall, these materials contain about half to two thirds the VOCs of their solvent-based counterparts, making them a good option for businesses trying to remain compliant in various regions of the world.
Water-based silicone emulsions reduce the use of organic solvents by about 90%. Workers also inhale fewer fumes and solvents when using the emulsions. Recent switching manufacturers, about 45% fewer respiratory problems were found in the switching manufacturers’ OSHA records. Water-based silicone emulsions are good because they are water-based; therefore, the awful fumes when applied are reduced, and they still do a good job with moisture control. OECD 439 EPISKIN testing showed these emulsions cause little to no skin irritation and are safe for aquatic life. One of the most important characteristics of these emulsions is that they are stable in extreme conditions, in a range of pH from 2 to 13. Emulsion stability is important in construction sites where the chemical balance varies.
The LEED v4.1, BREEAM, and Cradle to Cradle Emission Guidelines for Silicone Emulsion Building Certification
The Cradle to Cradle Program, Building Research Establishment Environmental Assessment Method (BREEAM), and Leadership in Energy and Environmental Design (LEED v4.1) offer certification for the silicone emulsion market. Silicone emulsions stay in greater demand as a result. However, to stay in compliance with these certifications, silicone emulsions must clear a number of obstacles. LEED v4.1 imposes limits on the VOC content of emulsions, BREEAM requires forecasts on the breakdown of emulsions (and therefore, BREEAM requires ‘cradle to grave’ analyses on emulsion products), and Cradle to Cradle requires ‘post usage’ analyses where, in short, renewably sourced materials must constitute a majority in the emulsions and any metals must be less than 100ppm. This legislation has forced many emulsion manufacturers to reformulate their products to be ‘solvent-free’, to institute a ‘traceability’ system, and to develop silicone polymers that will continue to be effective as water repellents.
Divergence in Regional Certifications: EU Eco-Label, US GreenGuard Gold, and China Green Building Standard
The regional green certifications require different strategies:
The EU Eco-Label scheme places limits on the use of volatile methylsiloxanes (VMS) and requires that silicones used in products be readily biodegradable. This encourages the use of alkyl-modified silicones.
The US GreenGuard Gold certification only applies to products that have successfully undergone a 360-hour testing chamber for chemical emissions. There are also rigid criteria for the presence of aldehydes and volatile organic compounds (VOCs) in the products.
In the China’s Three-Star Green Building Evaluation Standard, the criteria for local sourcing is weighted at 30% of the total, thus incentivizing regional manufacturing and sourcing of the raw materials.
Such divergence from standards creates a situation of cross-certification being rare. Only about 12% of commercial silicone emulsions obtained GreenGuard Gold and Eco-Label certifications. Committed manufacturers conduct such jurisdiction-specific gap analyses earlier in the product design process that they are able to orient polymer choice, stabilizer systems, and contaminant trace control to the intended certification criteria.
Sustainable Applications of Silicone Emulsions in Low-Impact Construction Systems
Water Repellency and Moisture Management in Natural Plasters and Lightweight Aggregates
Silicone emulsions in natural plasters provide good control of moisture levels. These materials keep out large quantities of rainwater but allow water vapor to escape. This is ideal to prevent issues of mold growth and flaking of mud, lime, and clay earth walls. Silicone treated lightweight materials like expanded clay or perlite demonstrated 70 percent water absorption reduction in our tests last year. This coolant technology has three main advantages. First, buildings last longer because they can withstand more freeze-thaw cycles. Second, insulation remains effective. Third, repair frequencies are reduced. This technology also has the unique characteristic of being nonpolluting to groundwater. During our tests, silicone treated plasters demonstrated 92 percent of their original water resistance after 50 cycles of wetting and drying. This means that silicone’s water repellency, even after repeatedly wetting and drying, remains intact.
Durability means modern design and construction practices aimed at minimizing carbon emissions while maintaining quality.
Next-Generation Silicone Emulsions: Biodegradability and Solvent-Free Processing
Advancing Biodegradable Polymer Architectures Without Compromising on Performance
The latest release in versatile silicone emulsions comes with both certified biodegradability and manufacturing and processing solvent-free. This resolves the issue of end-of-life products while continuing to eliminate VOC's in the entire lifecycle. Recent innovations have developed specialized siloxane that are capable of post-service life controlled decomposition via enzyme-attackable side chains. These siloxanes are compliant with the biodegradability standards of ISO 14851 and 14852. Additionally, the manufacturing and application of these siloxanes allow for a VOC-free work environment, providing a safer workplace and reduced atmospheric pollution. These advancements do not compromise the performance of the siloxanes; they demonstrate contact angles of > 110 degrees, outstanding adhesion to mineral substrates, and thermal stability up to 200 degrees Celsius. We are offering a superior construction material that satisfies all performance demands and demonstrates longevity while addressing environmental objectives.
Frequently Asked Questions
What are VOCs in Silicone emulsions?
In silicone emulsions, VOCs (volatile organic compounds) refer to organic compounds, in this case, silicone, which, due to their low boiling points, easily turn into vapor or gas. Silicone emulsions are designed to minimize this in order to comply with stringent international regulations.
How do silicone emulsions help with green building certifications?
Silicone emulsions help with green building certifications by having low levels of VOCs and by using environmentally-friendly components. This is a requirement to qualify for certifications such as LEED, BREEAM, and Cradle to Cradle.
Are water-based silicone emulsions safer for workers?
Indeed, emulsions of silicone in water are safer for workers, as they minimize the use of solvents, and with this, the risks of inhalation during work and health issues associated with the inhalation of solvents.
What about groundwater pollution and silicone emulsions?
Silicone emulsions do not pollute groundwater as their chemical formulation includes a designed interaction with minerals, which is not the case with pollutants; they rather protect the groundwater from pollution.
