Test reports · Certified values · Independent laboratories
Cotton wall coating certificates, tested and documented.
Paint covers. Wallpaper decorates. BELKA changes the wall.
BELKA is not paint and it is not conventional wallpaper. It is a seamless wall finish made from natural cotton fibres. It gives hard, cold walls a softer, warmer surface and makes a room feel calmer and more comfortable to live in – tested and documented by independent institutes internationally.
This page brings together what has actually been measured: very low documented emission values, tested sound absorption, thermal comfort, tested material purity, internationally documented fire behaviour and a low-disruption application process. Each claim on this page is tied to a named laboratory, a standard and a report number.
- Very low documented emissions
- Natural cotton fibres
- Tested sound absorption
- Thermal comfort
- Documented fire behaviour
- Classified smoke and droplet behaviour
- Tested material purity
- Low-disruption application
International test and quality evidence
Tested quality that changes how a room feels.
Nine documented test reports from independent institutes cover eight core quality areas of the BELKA cotton wall coating. Every card ties together what it means for you, the measured value, the institute, the standard and the reference number – clear, verifiable and directly traceable.
Very low emission values
Two separate tests. One matching TVOC figure.
A wall surface is in the room every day. So alongside how it looks and feels, what the material releases into the air matters.
Two emission tests document the same TVOC value for BELKA: 0.007 mg/(m²·h) . KCL additionally reports toluene 0.001 mg/(m²·h) and formaldehyde 0.003 mg/(m²·h) . KTR documents, for BELKA Cotton wall , benzene, toluene, ethylbenzene, xylene, styrene, formaldehyde and acetaldehyde each below 0.001 mg/(m²·h) .
What this means for you: a transparently tested emission profile and a better-informed material choice for living rooms, bedrooms, offices, hotels, clinics and any other interior in constant use.
Show test references and reference data
- Institutes
- KCL / KTR
- Test area
- VOC / TVOC / indoor air emissions
- References
- CT15-017892 / TAK-2021-086386
- KCL method
- Method 2010-24
- KTR methods
- KS I ISO 16000-9 / KS I ISO 16000-3
- Product tested
- BELKA / BELKA Cotton wall
- KCL result
- TVOC 0.007 · toluene 0.001 · formaldehyde 0.003 mg/(m²·h)
- KTR result
- TVOC 0.007 mg/(m²·h) · seven individual substances each below 0.001 mg/(m²·h)
Why it matters: very low documented emission values and more certainty when choosing a wall finish for interiors that are lived in all day.
Tested material values
Not just described as natural. Evidenced by SGS.
“Natural” is easy to write on a label. What counts is what a laboratory finds when it analyses the material itself.
SGS tested BELKA for soluble heavy metals, BTEX solvents and free formaldehyde against GB 18582-2008 . Lead, cadmium, chromium and mercury were not detected (below the method detection limit), as were benzene, toluene, ethylbenzene and xylene. Free formaldehyde was documented at 35 mg/kg against a test limit of 100 mg/kg .
What this means for you: the substances buyers most often ask about were looked for by an accredited laboratory and reported, rather than left to a marketing claim.
Show test references and reference data
- Institute
- SGS-CSTC Standards Technical Services
- Test area
- Soluble heavy metals / BTEX / free formaldehyde
- References
- SHCCM150300601 / SHCCM150300602-1
- Standard
- GB 18582-2008
- Product tested
- BELKA WALL COATING
- Result
- Pb / Cd / Cr / Hg: not detected (< MDL) · BTEX: not detected (< MDL) · free formaldehyde: 35 mg/kg
- Formaldehyde test limit
- 100 mg/kg
Why it matters: documented material values instead of unverified natural-product claims – a solid basis for a considered purchase.
Tested material purity
Three samples. No asbestos fibres detected.
Material purity is not a question you want answered by assumption, particularly for a surface that covers whole rooms.
AxxonLab, together with Airtests Mattests, examined three BELKA product samples – Cotton Blanc, Cotton Noir and Cotton Bleu – by polarised light microscopy to IRSST MA-244 . No asbestos fibres were detected in any of the three samples. The same analysis documents 75–90% natural cellulose fibres as the principal material component.
What this means for you: the fibre base of the coating has been examined under a microscope and described in a report, so the natural-fibre claim rests on an analysis rather than on a description.
Show test references and reference data
- Institutes
- AxxonLab / Airtests Mattests
- Test area
- Material purity / asbestos analysis
- Reference
- Certificat No. 231945 / project 21509
- Method
- IRSST MA-244 · polarised light microscopy (MLP)
- Samples tested
- Cotton Blanc / Cotton Noir / Cotton Bleu
- Asbestos result
- Fibres d’amiante n.d. / non décelées – in all three samples
- Material profile
- Natural cellulose fibres 75–90%
Why it matters: an examined, documented fibre base – and a clear answer to the question buyers ask most often about older-style fibre coatings.
A calmer-sounding room
Fewer hard reflections. More acoustic comfort.
Hard, smooth walls reflect sound. That is why a freshly painted room can feel echoey and tiring long before anyone calls it a noise problem.
TÜV NORD Systems measured the tested BELKA build-up to DIN EN ISO 354 and DIN EN ISO 11654 and documents a weighted sound absorption coefficient of αw = 0.4 (MH), Class D , with absorption values reaching 0.80 in the measured range.
What this means for you: the fibre surface takes up part of the sound energy instead of bouncing it back, which softens hard reflections and makes conversation, music and working in the room noticeably more comfortable.
Show test references and reference data
- Institute
- TÜV NORD Systems
- Test area
- Sound absorption / room acoustics
- Reference
- G.-Nr. 820SST121 / A.-Nr. 81 18 11 22 99
- Standards
- DIN EN ISO 354 / DIN EN ISO 11654
- Product tested
- BELKA cotton wall coating
- Result
- αw = 0.4 (MH) · Class D · absorption values up to 0.80
Why it matters: measured sound absorption rather than a general comfort claim – useful for open-plan rooms, home offices, hotels and practices.
A wall that feels less cold
Tested thermal conductivity behind a real surface comfort difference.
Touch a painted wall in winter and it feels cold. That sensation is a material property, and it can be measured.
MPA NRW – the materials testing institute of North Rhine-Westphalia – tested BELKA to EN 12667 / DIN EN 12667 and documents a thermal conductivity of λ = 0.0675 W/(m·K) .
What this means for you: the cotton fibre surface draws heat away from your hand more slowly than a hard painted wall, so the wall feels warmer to the touch and the space near it feels more comfortable to sit and live in.
Show test references and reference data
- Institute
- MPA NRW – Materialprüfungsamt Nordrhein-Westfalen
- Test area
- Thermal conductivity
- Reference
- Laboratory report no. 20007.01 / test report no. 423000175-20-E
- Standard
- EN 12667 / DIN EN 12667
- Product tested
- BELKA
- Result
- λ = 0.0675 W/(m·K)
Why it matters: a documented surface property, not an insulation claim – it is about how the wall feels, measured and reported.
Fire behaviour tested to British standards
Class 0 – documented by Bodycote / warringtonfire.
For hotels, offices, clinics, schools and the common parts of residential buildings, fire performance is not a preference. It is a specification requirement.
Bodycote warringtonfire tested BELKA to BS 476 Part 6 and BS 476 Part 7 and documents a Class 0 surface on the basis of Approved Document B, paragraph A13(b), with a fire propagation index of I = 5.1 and Class 1 surface spread of flame .
What this means for you: the cotton wall coating carries the fire classification most commonly asked for in UK specifications, tested under the standards those specifications name.
Show test references and reference data
- Institute
- Bodycote warringtonfire
- Test area
- Fire propagation / surface spread of flame / Class 0 assessment
- References
- WF 168649 & WF 168650
- Test standards
- BS 476 Part 6 / BS 476 Part 7
- Assessment basis
- Approved Document B, paragraph A13(b)
- Product tested
- Belka Interior Wall Coating
- Result
- Class 0 surface · fire propagation index I = 5.1 · i1 = 3.1 · i2 = 1.3 · i3 = 0.7 · Class 1 surface spread of flame
Why it matters: a named report number a specifier can quote, rather than an unsupported “fire safe” statement.
B1 (B-s1,d0): smoke and droplets tested
s1: low smoke development · d0: no flaming droplets.
In a fire, smoke and burning droplets are what obstruct escape. That is why the classification carries two separate sub-ratings alongside the main class.
A test report to GB 8624-2012 classifies the BELKA cotton wall coating as B1 (B-s1,d0) , with measured values of FIGRA0.2MJ 0 W/s , THR600s 0.1 MJ , SMOGRA 0 m²/s² , TSP600s 34 m² and droplet class d0 .
What this means for you: the two sub-ratings that matter for escape routes – smoke and burning droplets – are classified and documented, not left open.
Show test references and reference data
- Institute
- National Inspection and Testing Center for Building and Engineering Materials
- Test area
- Fire behaviour / smoke development / flaming droplets and particles
- Reference
- FH026-150180
- Standard
- GB 8624-2012
- Product tested
- BELKA cotton wall coating
- Classification
- B1 (B-s1,d0)
- Measured values
- FIGRA0.2MJ 0 W/s · THR600s 0.1 MJ · SMOGRA 0 m²/s² · TSP600s 34 m² · d0
Why it matters: smoke and droplet behaviour classified separately – the detail a fire officer or specifier will look for.
Heat release measured and documented
SGS figures that fill in the rest of the fire profile.
A classification tells you which box a material falls into. Heat release figures tell you how much energy it actually contributes to a fire.
SGS measured the heat release rate of BELKA to GB/T 16172 and documents a peak HRR of 82.4 kW/m² , an average of 27.1 kW/m² over 180 s and 20.7 kW/m² over 300 s, with a total heat release of 10.0 MJ/m² .
What this means for you: the fire profile is not carried by a single classification. It is backed by quantitative measurements from a second, independent laboratory.
Show test references and reference data
- Institute
- SGS-CSTC Standards Technical Services
- Test area
- Heat release rate
- Reference
- SHCCM150300599-2
- Standard
- GB/T 16172
- Product tested
- BELKA WALL COATING
- Result
- Peak HRR 82.4 kW/m² · average HRR 180 s 27.1 kW/m² · average HRR 300 s 20.7 kW/m² · total heat release 10.0 MJ/m²
Why it matters: measured energy values that give the fire classification quantitative backing.
Technical reference index
Cotton wall coating certificates: nine reports, eight quality areas.
The reference index brings together test institute, test area, standard, report number, product tested and the documented result – in one place, visible, and linked directly to the matching BELKA test card.
KCL emission test
- Test area
- VOC / TVOC / indoor air emissions
- Test institute
- KCL
- Reference
- CT15-017892
- Standard / method
- Method 2010-24
- Product tested
- BELKA
Documented result: TVOC 0.007 mg/(m²·h) · toluene 0.001 mg/(m²·h) · formaldehyde 0.003 mg/(m²·h)
Go to the matching test cardKTR emission test
- Test area
- VOC / TVOC / indoor air emissions
- Test institute
- KTR
- Reference
- TAK-2021-086386
- Standard / method
- KS I ISO 16000-9 / KS I ISO 16000-3
- Product tested
- BELKA Cotton wall
Documented result: TVOC 0.007 mg/(m²·h) · seven individual substances each below 0.001 mg/(m²·h)
Go to the matching test cardSGS material test
- Test area
- Soluble heavy metals / BTEX / free formaldehyde
- Test institute
- SGS-CSTC Standards Technical Services
- Reference
- SHCCM150300601 / SHCCM150300602-1
- Standard / method
- GB 18582-2008
- Product tested
- BELKA WALL COATING
Documented result: Pb, Cd, Cr and Hg: not detected · BTEX: not detected · free formaldehyde: 35 mg/kg
Go to the matching test cardAxxonLab / Airtests material analysis
- Test area
- Material purity / asbestos analysis
- Test institute
- AxxonLab / Airtests Mattests
- Reference
- Certificat No. 231945 / project 21509
- Standard / method
- IRSST MA-244 · MLP
- Product tested
- Cotton Blanc / Cotton Noir / Cotton Bleu
Documented result: no asbestos fibres detected in any of the three product samples · natural cellulose fibres 75–90%
Go to the matching test cardTÜV NORD sound absorption measurement
- Test area
- Sound absorption / room acoustics
- Test institute
- TÜV NORD Systems
- Reference
- G.-Nr. 820SST121 / A.-Nr. 81 18 11 22 99
- Standard / method
- DIN EN ISO 354 / DIN EN ISO 11654
- Product tested
- BELKA cotton wall coating
Documented result: αw = 0.4 (MH), Class D · absorption values up to 0.80
Go to the matching test cardMPA NRW thermal conductivity test
- Test area
- Thermal conductivity
- Test institute
- MPA NRW – Materialprüfungsamt Nordrhein-Westfalen
- Reference
- Laboratory report no. 20007.01 / test report no. 423000175-20-E
- Standard / method
- EN 12667 / DIN EN 12667
- Product tested
- BELKA
Documented result: λ = 0.0675 W/(m·K)
Go to the matching test cardBodycote / warringtonfire fire test
- Test area
- Fire propagation / surface spread of flame / Class 0 assessment
- Test institute
- Bodycote warringtonfire
- Reference
- WF 168649 / WF 168650
- Standard / method
- BS 476 Part 6 / BS 476 Part 7 · Approved Document B, paragraph A13(b)
- Product tested
- Belka Interior Wall Coating
Documented result: Class 0 surface · fire propagation index I = 5.1 · Class 1 surface spread of flame
Go to the matching test cardSmoke and droplet classification
- Test area
- Fire behaviour / smoke development / flaming droplets and particles
- Test institute
- National Inspection and Testing Center for Building and Engineering Materials
- Reference
- FH026-150180
- Standard / method
- GB 8624-2012
- Product tested
- BELKA cotton wall coating
Documented result: B1 (B-s1,d0) · FIGRA0.2MJ 0 W/s · THR600s 0.1 MJ · SMOGRA 0 m²/s² · TSP600s 34 m² · d0
Go to the matching test cardSGS heat release test
- Test area
- Heat release rate
- Test institute
- SGS-CSTC Standards Technical Services
- Reference
- SHCCM150300599-2
- Standard / method
- GB/T 16172
- Product tested
- BELKA WALL COATING
Documented result: peak HRR 82.4 kW/m² · average HRR 180 s 27.1 kW/m² · average HRR 300 s 20.7 kW/m² · total heat release 10.0 MJ/m²
Go to the matching test cardTest context
Technical quality shows up as measurable results.
The BELKA documentation covers four central test areas: room acoustics, fire behaviour, emissions and material analysis. Together they show what has actually been examined – and what the documented results are worth in a real interior.
Acoustic measurement
Tested sound absorption for fewer hard reflections and a calmer-sounding room.
Fire behaviour
Internationally documented fire behaviour, for a wall finish that holds up technically as well as visually.
Emissions
Very low documented emission values, for a more informed material choice indoors.
Material analysis
Tested material values and a natural fibre base – documented rather than simply asserted.
Low-disruption application
Redecorate without turning your home into a building site.
BELKA is mixed with water and applied with a trowel. That makes the work clean, predictable and easy to do one section at a time.
There is no strong paint smell. Compared with many conventional redecorating jobs there is far less sanding dust, and walls can be done one after another rather than all at once.
You do not have to shut down the whole room. Redecorating and normal life fit together far better – which matters in flats, houses, offices, hotels and practices, anywhere a room needs to be usable again quickly.
How to apply BELKA, step by stepShaping the surface, not just covering it
BELKA is not applied as a thin film of paint. The cotton fibre mixture forms a seamless surface with a texture of its own and can visually settle fine pores, small joints and slight unevenness.
The wall reads as more even, softer and better made – often with less preparation than very smooth coating systems demand.
BELKA does not just give the wall a new colour. It gives it a different material presence.
Naturally built. Made to stay.
BELKA is based on natural cotton and cellulose fibres and is worked with water. The seamless surface can be repaired locally and renewed section by section.
The natural fibre base, repairability and targeted renewal make long use realistic and avoid needless full replacement. That is how BELKA combines comfort, considered use of materials and a wall finish you can keep.
More on BELKA materials and sustainabilityInternational testing breadth
Not a single laboratory. Not a single logo.
The BELKA documentation profile spans active test areas, international references and years of continuity. That breadth is what separates BELKA from an ordinary surface carrying a couple of badges.
Active technical references
- TÜV NORD
- MPA NRW
- KTR / KCL
- AxxonLab
- Bodycote
International and historical references
- SGS
AWTA
KFI / GIC
GIC
CE
ISO 9001
UKAS
TSE
Years of testing and years of use
Tested. Installed. Proven.
BELKA combines test documentation built up over years with long practical experience. The seamless cotton fibre wall surface has been examined by independent institutes across the core material and performance areas, and has proven itself in private and commercial interiors alike.
The test reports evidence the properties that matter – from emission and material values through sound absorption and thermal conductivity to fire, smoke and droplet behaviour. Years of real installation show what those properties are worth day to day.
International testing, long market experience and real-world use together form a quality profile you can rely on – for a wall finish that offers far more than paint or conventional wallpaper.
In short
What sets BELKA cotton wall coating apart.
BELKA is a seamless interior wall surface made from natural cotton fibres and a category of its own alongside paint and conventional wallpaper. Its quality profile covers internationally documented evidence on emissions, material values, material purity, sound absorption, thermal conductivity, fire behaviour, smoke and droplet behaviour and heat release.
- Product category
- Seamless interior cotton wall coating made from natural cotton fibres
- Compared against
- An alternative to paint, wallpaper and conventional wall coatings
- Material base
- Natural cotton and cellulose fibres, mixed with water
- What you get
- Very low documented emission values, a calmer-sounding room, a wall that feels warmer to the touch, a natural material presence and a low-disruption application process
- Areas tested
- VOC and TVOC, BTEX, soluble heavy metals, asbestos analysis, sound absorption, thermal conductivity, fire behaviour, smoke and droplet behaviour and heat release
Questions and answers
Clear answers. Verifiable evidence.
The questions people ask most often about BELKA, the documented product properties, the technical test areas and how the evidence is held.
What is BELKA?
BELKA is neither paint nor conventional wallpaper. It is a seamless interior cotton wall coating made from natural cotton fibres, combining natural material quality, individual design and real day-to-day comfort.
Is BELKA a paint?
No. Paint covers the wall with a thin film. BELKA is mixed with water, applied with a trowel and forms a seamless surface with its own texture, feel and material presence.
Is BELKA a wallpaper?
No. BELKA is applied directly to the wall – no rolls, no paste, no visible seams. The result is a continuous, seamless surface of natural cotton fibres.
Why does BELKA not publish the full test reports as PDFs?
The complete test reports are part of BELKA's controlled technical documentation. This page publishes the reference data that matters: test institute, test area, method, standard, report number and the documented result. For qualified trade, specification and B2B enquiries, the relevant documents can be supplied in a structured form on request.
Is BELKA sound absorbing?
Yes. TÜV NORD documents a weighted sound absorption coefficient of αw = 0.4 (MH), Class D for the tested BELKA build-up. That reduces hard sound reflections and supports a calmer, more comfortable room.
Is BELKA sound insulation?
BELKA absorbs sound and so improves room acoustics. The cotton fibre surface takes up part of the sound energy, reduces hard reflections and makes the room sound calmer. Structural sound insulation between rooms does a different job.
What does thermal comfort mean with BELKA?
The natural cotton fibre surface feels less cold to the touch than a hard painted wall. Comfort close to the wall improves, and the room reads as warmer and more welcoming. MPA NRW documents a thermal conductivity of λ = 0.0675 W/(m·K) for BELKA.
Is BELKA an insulation system?
BELKA is a high-quality interior cotton wall coating with documented thermal conductivity. Its strength is the more pleasant surface feel and the thermal comfort that comes with it. A structural insulation system performs a different technical function.
What fire evidence exists for BELKA?
BELKA has a fire profile documented several times over internationally. On the basis of tests to BS 476 Part 6 and BS 476 Part 7, Bodycote / warringtonfire confirms a Class 0 assessment. A further test report documents B1 (B-s1,d0) to GB 8624-2012. SGS adds quantitative heat release figures.
Were any asbestos fibres detected?
No. AxxonLab / Airtests examined three BELKA product samples by microscopic analysis. No asbestos fibres were detected in any of the three samples. The analysis also documents natural cellulose fibres as a principal material component.
Trade and project enquiries
Technical documentation for qualified projects.
For B2B, specification, design and trade enquiries, the relevant technical documents can be supplied separately and in a structured form.
This page brings together test institutes, test methods, standards, reference numbers and documented results. For a specific project, the matching evidence can be assembled and assigned clearly to each test area.
Discover BELKA
With BELKA you are choosing more than a wall decoration.
BELKA combines a natural, seamless cotton fibre wall surface with very low documented emission values, tested sound absorption, thermal comfort, a low-disruption application process and an internationally documented quality profile.
The result is a wall that not only looks different but feels different, and that lifts the room in material presence, acoustics and everyday comfort.
That is exactly where it parts company with paint and conventional wallpaper.
