Name Planned shipping method Start Date  
Coefficient of linear thermal expansion (CTLE) ISO 11359
Parameters (quantitative): Mean CLTE (25-100°C) [10-6 1/k], Mean CLTE (25-80°C) [10-6 1/k], Differential CLTE (100°C) [10-6 1/k], Differential CLTE (80°C) [10-6 1/k]
Article Number: 2010758
Category: chemical-physical testing material testing plastics (thermoplastics)
Accreditation: This proficiency test is within the scope of the A2LA and the DAkkS accreditation.
Shipping at room temperature April 2026 Add to cart
Coefficients of friction ISO 8295
Parameters (quantitative): Static friction [-], Kinetic friction [-]
Article Number: 2010780
Category: physical mechanical testing material testing films
Accreditation: This proficiency test is within the scope of the A2LA and the DAkkS accreditation.
Shipping at room temperature March 2026 Add to cart
Coffee
Parameters (quantitative): water content [g/100 g], ash [g/100 g], pH value [-], acid content (acidity) at pH 6,00 [mmol/kg], acid content (acidity) at pH 7,00 [mmol/kg], acid content (acidity) at pH 8,00 [mmol/kg], water soluble extract [g/100 g], caffeine [g/100 g], acrylamide (CAS 79-06-1) [µg/kg], chlorogenic acid 1 [g/100 g]
Article Number: 2010392
Category: chemical-physical testing food and feed non-alcoholic beverages
Accreditation: This proficiency test is within the scope of the A2LA and the DAkkS accreditation.
Frozen shipping October 2025 Add to cart
Coffee
Article Number: 2010392
October 2026 Add to cart
Coffee infusion (triangle test, flavour taint)
Parameters (qualitative): organoleptic testing - triangle test flavour
Article Number: 3010016
Category: sensory testing food and feed non-alcoholic beverages
Accreditation: This proficiency test is within the scope of the A2LA and the DAkkS accreditation.
The proficiency test price includes one test person; an additional sample set must be booked for each additional test person.
Refrigerated shipping September 2025 Add to cart
Coffee infusion (triangle test, flavour taint)
Parameters (qualitative): organoleptic testing - triangle test flavour
Article Number: 3010016
July 2026 Add to cart
Coliform bacteria milk powder
Parameters (quantitative): Coliforms [cfu/g], aerobic total count [cfu/g]
Article Number: 2010160
Description: Possible methods for participation, e.g.: ISO 4832, ISO 4833, §64 LFGB L00.00-88
Category: immunological, molecular biological and microbiological testing food and feed milk powder
Accreditation: This proficiency test is within the scope of the A2LA and the DAkkS accreditation.
risk group 1
Frozen shipping May 2026 Add to cart
Coliforme bacteria ground meat
Parameters (quantitative): Coliforms [cfu/g], aerobic total count [cfu/g]
Article Number: 2010936
Category: immunological, molecular biological and microbiological testing food and feed meat products
Accreditation: This proficiency test is within the scope of the A2LA and the DAkkS accreditation.
risk group 1
Frozen shipping November 2025 Add to cart
Coliforme bacteria ground meat
Article Number: 2010936
August 2026 Add to cart
Coliforme bacteria mineral water and table water
Parameters (qualitative): Coliforme qualitative
Article Number: 2010134
Category: immunological, molecular biological and microbiological testing food and feed mineral water and table water
Accreditation: This proficiency test is within the scope of the A2LA and the DAkkS accreditation.
risk group 1
Frozen shipping September 2025 Add to cart
Coliforme bacteria mineral water and table water
Parameters (qualitative): Coliforme qualitative
Article Number: 2010134
October 2026 Add to cart
Color measurement (background material) ISO 20471 (5.1)
Parameters (quantitative): chromaticy coordinate x [-], chromaticy coordinate y [-], luminance factor β [-]
Article Number: 2010106
Category: chemical-physical testing material testing protective clothing
Accreditation: This proficiency test is within the scope of the A2LA accreditation.
Shipping at room temperature May 2026 Add to cart
Colour check (triangle test)
Parameters (qualitative): organoleptic testing - triangle test
Article Number: 3010007
Category: sensory testing food and feed food matrices (other)
Accreditation: This proficiency test is within the scope of the A2LA and the DAkkS accreditation.
The proficiency test price includes one test person; an additional sample set must be booked for each additional test person.
Shipping at room temperature April 2026 Add to cart
Colour fastness of dyed paper (EN 646)
Parameters (quantitative): colour fastness (dist. Water) [-], colour fastness (acetic acid 3%) [-], colour fastness (olive oil) [-], colour fastness (alkali salt solution) [-]
Article Number: 2010646
Category: chemical-physical testing consumer goods and packaging paper and board
Accreditation: This proficiency test is within the scope of the A2LA and the DAkkS accreditation.
Shipping at room temperature May 2026 Add to cart
Colour fastness of fluorescent whitened paper (EN 648)
Parameters (quantitative): colour fastness (dist. Water) [-], colour fastness (acetic acid 3%) [-], colour fastness (olive oil) [-], colour fastness (alkali salt solution) [-]
Article Number: 2010648
Category: chemical-physical testing consumer goods and packaging paper and board
Accreditation: This proficiency test is within the scope of the A2LA and the DAkkS accreditation.
Shipping at room temperature May 2026 Add to cart
Colour fastness to bleaching - hypochlorite ISO 105-N01
Parameters (quantitative): change in color sample [grade]
Article Number: 2010633
Category: chemical-physical testing material testing textiles
Accreditation: This proficiency test is within the scope of the A2LA accreditation.
Shipping at room temperature October 2025 Add to cart
Colour fastness to bleaching - hypochlorite ISO 105-N01
Article Number: 2010633
October 2026 Add to cart
Colour fastness to bleaching - peroxide ISO 105-N02
Article Number: 2010917
Category: chemical-physical testing material testing textiles
Accreditation: This proficiency test is within the scope of the A2LA accreditation.
Shipping at room temperature October 2025 Add to cart
Colour fastness to bleaching - peroxide ISO 105-N02
Article Number: 2010917
October 2026 Add to cart
Colour Fastness to chlorinated water ISO 105-E03
Parameters (quantitative): Colour change sample [20 mg/l [grade], Colour change sample [50 mg/l [grade], Colour change sample [100 mg/l [grade]
Article Number: 2010229
Category: chemical-physical testing material testing textiles
Accreditation: This proficiency test is within the scope of the A2LA accreditation.
Shipping at room temperature October 2025 Add to cart
1 Parameters with this label depend on the number of participants and/or the choice of materials.
Under certain circumstances, this parameter may not be available in the proficiency test.