Recycled Plastic Panels in Architecture: Feedstock, Fire and EPDs

Recycled plastic panels are not one material. The documents we read cover three constructions that share a feedstock story and little else: pressed solid sheets of a single polymer family, thin needle-punched PET felt used for sound absorption, and injection-moulded facade tiles. This profile covers panels and boards made from recycled thermoplastics for interiors and facades. It does not cover wood-plastic composites, plastic lumber for decking, or insulation made from recycled textiles.

We read manufacturer data sheets, fire-test and emissions reports published by Smile Plastics, six environmental product declarations (EPDs), one health product declaration, standards catalogue pages (not the paid texts) and one academic abstract. Each section says which. We link only to profiles that exist; for bio-based wall finishes see cork wall tiles and linoleum.

What are recycled plastic panels made from?

Solid sheets. Smile Plastics (Swansea, UK) presses sheets from sorted waste plastic. Its website says the raw material is a mix of pre- and post-consumer waste, "from yoghurt pots to white goods", and that its panels contain no additives, binders or resin.^[9] Its EPDs describe the PET sheets as made from single-use waste "ranging from cosmetic bottles to food packaging" and the HIPS sheets from white goods to yoghurt pots, in both cases ">99 %" recycled polymer plus pigment suspended in oil, which the EPD leaves out of the model as under 0.78 % of the mass.^[5][6] A Black Dapple HDPE product page lists chopping boards and plastic packaging as the source.^[9] Sheets are 3,000 × 1,200 mm and 12 or 20 mm thick as standard.^[9] The company's own data sheet warns that panels can contain mixed plastics and that its values are indicative only.^[1]

PET felt. In the Woven Image EPD, EchoPanel is made from dope-dyed fibre melt-spun from post-consumer water and soft-drink bottle flakes and virgin low-melt bicomponent fibre (50 % virgin PET core, 50 % co-polyester sheath), then carded, cross-lapped, needled and calendered.^[12] Times Fibrefill's EPD lists 1.08 kg of recycled PET fibre and 0.72 kg of virgin PET fibre per m² (1.8 kg) of a 9 mm panel, which is 60 % and 40 %.^[14] Texfel's EPD lists 1.60 kg of PET at 61.2 % post-consumer and 0.0216 kg of polyester per m² of Echo 9, 60.4 % post-consumer overall, and describes the product as "100 % PET composition, minimum 60 % recycled".^[15] So the felts are not "100 % recycled" in their own declarations; Woven Image and Times name virgin fibre as the remainder, while Texfel's EPD does not say what the remainder is.

Facade tiles. The Pretty Plastic EPD describes FirstOne tiles as post-consumer recycled PVC, injection-moulded at 400 × 304 mm and 29 mm thick for ventilated facades, mounted with one screw per tile up to 15 m building height and three above.^[16]

How is recycled content claimed and documented?

Three levels of evidence appear in the documents. The first is the manufacturer's own statement: Smile's data sheet and website call the sheets "100 % recycled/recyclable".^[1][9] The second is a content declaration inside a third-party verified EPD. Smile's two EPDs list 100.0 % secondary material input and 81.8 % secondary material in outputs;^[5][6] Woven Image's, Times's and Texfel's list post-consumer recycled material in weight-percent for the product (60 %, 60 % and 60.4 % respectively).^[12][14][15] The third level would be a certificate under a recycled-content scheme. The only scheme name we saw is Global Recycled Standard, which Times lists among its company certifications; we did not open a certificate or the scheme's rules.^[14]

Two terms need care. "Recycled" covers both pre-consumer (production scrap) and post-consumer waste, and the documents split them differently: the felt EPDs declare a post-consumer share, while Smile states a mix and quantifies neither share. Smile's HPD describes its PET sheets as 100 % pre- and post-consumer recycled PETG, whereas its data sheet heads the material "rPET / rPET copolyester", its EPD calls it polyethylene terephthalate (rPET) and the 2022 BTTG report names the sample "Recycled PETG sheets"; we did not resolve the naming and the HPD is self-prepared.^[1][3][5][8] BSI lists BS EN ISO 14021:2026 (self-declared environmental claims) and BS EN 15343:2007 (traceability and recycled content of recycled plastics) as current. We read only the catalogue entries, so we do not state what either standard defines or requires.^[17][18] A specification that wants more than a manufacturer statement can ask for the EPD content declaration, and say which of pre-consumer and post-consumer it needs.

How do recycled plastic panels behave in a fire?

In the documents we read, results differ by polymer and by test set-up (substrate and mounting), and they are not interchangeable. Smile's fire brochure says its sheets reflect the inherent flammability of the raw plastics, with no binders or resins added, and that they do not perform as well as fire-resistant virgin plastics, metals or solid surfaces.^[2] It compares its PET result with untreated plywood and MDF (higher) and high-pressure laminate (not far below); this is the manufacturer's comparison, with no test data for those products in the document.^[2]

Source notes. The three Smile documents differ for PET: the data sheet and the brochure print C-s1, d0, while the only test report we opened says "a possible Class C, s1, d0 but a definite Class C, s2, d0" for a PETG sheet of unstated thickness (its individual TSP600s values were 46.2, 36.2 and 51.1 m², against an s1 limit of 50 printed in the same report). We show both and do not decide between them, and we cannot tell whether a later report exists. The PET results were obtained with the sheet adhered to a 12 mm calcium silicate board (data sheet, BTTG report) or "with a silica backer" (brochure); none of the documents we read says how the class carries over to other substrates or to a panel fixed over a cavity. The brochure refers readers to the test certificate and recommends advice from an appropriate fire engineer.^[1][2][3] We read no ASTM E84 result for any product.

What about UV, thermal movement, stiffness and creep?

UV and outdoor use. Smile's HIPS data sheet says the material is "not recommended for outdoor applications" because it may yellow or destabilise with UV exposure.^[1] Its PET EPD says Smile's PET sheets "offer many key features for interior and exterior applications at all scales", and its PET and HDPE data sheets carry no UV statement.^[1][5] We read no UV or weathering test for any product. The only exterior product among those we read, the PVC facade tile, is described by its EPD for ventilated facades and gives a fire class and mounting rules, not a weathering result.^[16]

Thermal movement. Smile's HDPE product page says nominal thicknesses and asks designers to allow for thermal expansion of "up to 2mm per metre over a 10°C range".^[9] Its data sheet gives coefficients of 82.7 µm/m°C for PET, 97.6 for HIPS and 158.4 for HDPE.^[1] Our calculation, ΔL = α × L × ΔT, for a 3,000 mm sheet over 20 °C: PET 82.7 × 10⁻⁶ × 3,000 × 20 = 5.0 mm; HIPS 5.9 mm; HDPE 9.5 mm. For HDPE that is 1.58 mm per metre per 10 °C, consistent with Smile's "up to 2 mm". These are arithmetic on printed coefficients, not design values. The fabrication guidelines are listed on Smile's product page, but the entry carried no link we could open, so we read no fixing-detail guidance.

Source notes. All values are from the Smile Plastics data sheet (pages 4, 5 and 9, read from the rendered pages); the sheet says its data are indicative and that panels may not be a single plastic. The HDPE page prints no test standards, so its values are listed without one.^[1] On the printed values the PET sheet's modulus is about 2.6 times the HDPE sheet's (2,106 / 802, our division) and has a heat deflection temperature of 46.1 °C against 72.6 °C. The data sheet gives no creep or long-term load data. A 1999 dissertation on recycled plastic lumber, a different product, states in its abstract that long-term deformation under constant load can be several times the initial elastic deformation and that serviceability often governs design; we read the repository abstract page only, and it cannot be applied to these sheets without product tests.^[19] We read no span tables for Smile's sheets.

What do the documents say about emissions and additives?

Smile published a Eurofins Product Testing Denmark chamber report dated 11 June 2025 on a 20 mm pigmented HIPS sample (measured thickness 19 mm). After 14 days it found TVOC of 0.83 µg/m³ in the classroom scenario and 2.7 µg/m³ in the office scenario, styrene as the only VOC quantified, and formaldehyde below 2 and 4 µg/m³; the report gives pass results for Indoor Air Comfort USA, CDPH v1.2, LEED v5 and BREEAM International at its "Exemplary" level. The air change rate was 0.5 per hour rather than 1.0 and the results were calculated back; the result is valid only for the tested sample.^[7] Smile's website and HPD describe the panels as Indoor Air Comfort GOLD; the report we read names Indoor Air Comfort USA, and we opened no GOLD certificate or report for PET or HDPE.^[7][8][9] A Woven Image specification sheet for the 7 mm panel states a VOC emission rate below 0.02 mg/m²/hr (ASTM D5116, 7 days);^[13] we opened no GREENGUARD document for any product.

On additives, Smile's website says its panels contain no additives, binders or resin.^[9] Its EPD excludes an oil-suspended pigment of under 0.78 % of the mass from the model,^[5] and its self-prepared HPD lists pigment substances, each at up to 0.24 % by weight, including a form-specific hazard note for particulate inhalation during sawing, sanding or grinding, and says a full inventory of the pigments was not available because suppliers treat it as confidential.^[8] The HPD states there is no intentionally added PFAS.^[8] Smile's sustainability page says its matt factory finish needs no sanding and so reduces microplastic pollution; we read no measurement behind that statement.^[9]

What happens at end of life?

Manufacturers call the panels recyclable, and the EPDs show how differently that is modelled.

• Smile Plastics (PET and HIPS EPDs). The EPDs say the product is 100 % recyclable but model UK rates instead: 4.8 % of production returned and re-shredded, and for the remainder 37 % recycling, 44 % incineration with energy recovery and 19 % landfill. They claim no Module D credit for avoided virgin material because of the 100 % recycled content.^[5][6] The buy-back scheme takes back offcuts and end-of-life Smile Plastics panels, but not panels contaminated with glue, adhesives or solvents or bonded to other substrates; the customer pays return freight.^[10]
• Woven Image. It assumes 100 % landfill outside Europe, because very little take-back data exist and, in the EPD's words, no specific market yet exists for waste panels, and models 100 % incineration with energy recovery as a European scenario. A take-back scheme is mentioned.^[12]
• Texfel. The EPD lists the panel as recyclable in its product properties but models landfill as inert waste with no recycling or recovery, calling it a conservative scenario.^[15]
• Times Fibrefill. It assumes the PET is recycled in India at a 90 % recycling rate, 10 % to landfill, with 70 % recycling efficiency in Module D.^[14]
• Pretty Plastic. The EPD's output flows list 24.4 kg per m² of material for recycling in module C3.^[16]

Our reading: in these documents "recyclable" describes the material, while the modelled scenarios assume collection and treatment routes (UK rates, landfill, recycling in India) that the specifier does not control. From Smile's stated acceptance conditions we infer that a design intending to use its take-back route should keep the panel unbonded and clean.^[10]

How do the EPDs we read compare?

The table shows six declarations from five manufacturers exactly as each states them; nothing was converted. They are not directly comparable, and the columns that explain why are kept separate.

Source notes. Mass per declared unit varies from 1.62 kg/m² (Texfel) to 24.42 kg/m² (Pretty Plastic), a factor of about 15 (24.42 / 1.62, our division), so a per-m² figure measures different quantities of plastic. The negative Smile totals are accounting results: the PET EPD shows GWP-fossil of +18.4 and GWP-biogenic of −25.1 in A1–A3, reversed by +25.1 in A5, lists no biogenic carbon in the product and 6.031 kg C in packaging; we do not net them, and the fossil figure sits alongside.^[5] Woven Image's EPD likewise shows GWP-biogenic of −0.745 in A1–A3 and +0.766 in A5, and states that results for A1–A3 used without module C may mislead.^[12] The service lives (5, 30, 50 and 50 years) and end-of-life scenarios differ, as the previous section shows. The International EPD System text in the Woven Image, Times and Texfel EPDs says EPDs from different programmes may not be comparable and sets conditions for comparison, including the same PCR and version (Times: the same first-digit version number) and identical declared or functional units; the PCR versions printed in the three PDFs differ (1.3.4, 2.0.1 and 1.2.5).^[12][14][15] Where recycled material enters the model also differs: Smile's EPDs start the life cycle after the plastic has passed end-of-waste (collected, sorted, decontaminated and shredded), and Times allocates no impact to the recycled PET raw material.^[5][6][14] We rank no product and draw no conclusion about which is lower.

Registry checks, 12 October 2026, on the registry pages themselves: the EPD Australasia page lists Woven Image EPD-IES-0019920:001 as registered 20 March 2025 and valid until 20 March 2030 (PCR 1.3.4); the International EPD System library shows Times EPD-IES-0031770:002 (version date 26 May 2026, validity 25 May 2031, PCR 2.0.1) and Texfel EPD-IES-0011400:001 (validity 13 November 2028, PCR 1.3.4) with status "Valid". We could not check the EPD Hub entries for Smile or the NIBE entry for Pretty Plastic, whose PDF prints status "verified" and validity to 8 February 2028.^{[5][12][14][15][16]}

When to specify it, and when not

Where the documents support it

• Interior surfaces, joinery and furniture in sheet form. Smile's HPD describes the sheets as hard, dense and rigid, suited to furniture, fit-outs, washrooms and wall cladding, and says they can be milled, screwed, glued or thermoformed; Smile's data sheet gives fungal growth of 0 % and its website calls them waterproof.^[1][8][9] Treat these as manufacturer statements; the HPD is self-prepared.
• Sound absorption where a felt panel fits. Texfel's EPD states up to αw 0.90 and class A under EN ISO 11654 (EN ISO 354 test);^[15] Woven Image's EPD lists wall panels or tiles, dividers and ceiling baffles;^[12] Times's EPD covers 5 to 24 mm variants and says the representative product exhibits a noise reduction coefficient of 0.26 to 1, without a mounting condition in the passage we read.^[14] Absorption depends on thickness and air gap: Woven Image's 7 mm sheet gives NRC 0.25, 0.45 and 0.70 with no, 20 mm and 50 mm gap (AS ISO 354).^[13] A figure without its mounting and thickness is not a specification.
• Projects that want a documented recycled feedstock. Third-party verified EPDs state the feedstock and, in five of the six, describe the end-of-life scenario modelled, which is more than a "100 % recycled" statement alone.^{[5][6][12][14][15][16]}

Where it needs care or may not suit

• Fire regulations. The class depends on polymer and set-up (see the fire table). The brochure says Smile's sheets do not perform as well as fire-resistant virgin plastics, metals or solid surfaces, and that a coating system tested by Envirograf reaches B-s2, d0, applied to finished joinery with a changed surface feel and cleaning regime.^[2] Where a class B is required for the actual build-up, the documents we read give it only for the felt (EPD statement) and the coated system (brochure statement), not as an independent report.^[2][15]
• Exterior and UV. Smile's data sheet does not recommend HIPS outdoors; its PET EPD mentions interior and exterior applications without a UV test, the HDPE documents we read say nothing about UV, and we read no weathering test.^[1][5]
• Movement and fixing. HDPE moves the most (158.4 µm/m°C, 9.5 mm over 3 m and 20 °C, our calculation), and Smile's HDPE heat deflection temperature is 46.1 °C.^[1] We read no service-temperature limit; our reading is that use near heat sources or in sunlit zones is a question to put to the manufacturer.
• Load and span. The data sheet gives modulus and strength but no creep; for HDPE the modulus is 802 MPa. A thesis abstract on plastic lumber, a different product, states that long-term deformation under constant load can be several times the initial elastic deformation.^[1][19] Shelves, tabletops and long spans need product-specific data, which we did not find.
• Joints, adhesives and finishing. Smile says HDPE is generally difficult to glue because of its low surface energy; it names Bondchem M451 and Permabond TA4610 as adhesives that worked and supplies its own HDPE adhesive in the UK only; solvent glues can melt the surface; tight contact is needed.^[11] Bonding also rules out its buy-back.^[10] We read no repair or refinishing guidance.
• Supply and variation. Smile makes Core materials in batches of 5 to 10 tonnes, says the colour ratio or exact colour may vary slightly between batches and that no two panels are the same, and asks buyers who need to minimise colour variation to discuss it before ordering so that all products come from the same batch. Its Black Dapple HDPE page says the material is currently unavailable as a sample (contact the team for panel availability).^[9]
• Substance disclosure. If a certification asks for full ingredient lists, the Smile HPD says the pigment inventory is incomplete because of supplier confidentiality.^[8]
• Wet areas and felts. The Woven Image 7 mm specification sheet warns against excessive amounts of water and asks for adequate ventilation where the product is likely to be subject to excessive moisture; the felt EPDs describe wall, ceiling and divider uses in commercial interiors, and we found no wet-area guidance in them.^{[12][13][14][15]}
• Documents that are moving. The Times EPD we read is version :002 dated 26 May 2026; Smile's data sheet is indicative and its EPDs date from December 2023 with a stated 5-year reference service life.^[5][14][1]

We read no independent test report for the strength, UV durability or fire class of any felt or of the facade tile, and the documents give no basis for choosing between the named manufacturers. The table of suppliers below shows whose documents we read, not who to buy from.

Suppliers whose documents we read

Frequently asked questions about recycled plastic panels

The bottom line on recycled plastic panels

In the documents we read, "recycled plastic panel" covers materials whose fire class, UV behaviour, movement and end of life differ more than their recycled-content statements do. The declarations differ on how much of the feedstock is declared post-consumer, on how the panel is modelled to end, and on service life, which runs from 5 to 50 years; Smile's own documents disagree on the PET sheet's smoke class. We did not read the texts of ISO 14021, EN 15343 or EN 13501-1, found no emissions test report for the felts or for PET and HDPE sheet, no thermal conductivity, no UV test and no span tables; the figures above are what the named documents state.

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