UK laboratories,
better understood.

The laboratory bench

Choosing lab supplies that fit the work

A well-equipped laboratory is built around its methods. Start with the task, then decide which instruments, consumables and records it needs.

“Lab supplies” covers a wide range: glassware, plasticware, liquid-handling tools, sample containers, weighing accessories, cleaning materials and protective equipment. These items can look interchangeable in a catalogue. In use, their dimensions, material, tolerance and compatibility often determine whether a method is practical and repeatable.

Write down the quantity you need to measure, the material it will contact, the conditions it will experience and how often the task repeats. A school teaching experiment, a water-testing service and an industrial quality-control laboratory may all use a beaker, but they will not necessarily need the same purchasing specification.

Match the vessel to the job

Choose labware by what you need it to do, rather than treating every printed scale as equally precise. Read the manufacturer's specification for the exact product, including its stated tolerance and permitted use. A catalogue photograph cannot establish those properties.

For product-specific volume tolerances and markings, consult the manufacturer's documentation. DWK's volumetric glassware reference provides further background.

Specify the complete working set

An instrument purchase is rarely complete on its own. Identify the accessories, consumables, cleaning materials and records needed to use it from the first day. For a balance, that might include a suitable bench location, compatible weighing containers and a plan for performance checks. For liquid handling, consider the pipette and tip as a working system, rather than separate catalogue decisions.

Compare the total cost over the expected working period: replacement parts, service access, consumable availability, waste handling and staff time all matter. Buying a larger pack only saves money if the contents remain suitable until they are used. An unfamiliar substitute should go through the laboratory's change process before becoming the default.

Materials & equipment

The material is part of the method

A useful container holds the sample without changing the question you are trying to answer.

Glass, polypropylene, polyethylene and fluoropolymers have different strengths and limitations. There is no single “best laboratory material”. Your choice depends on the substance, concentration, contact time, temperature and cleaning process. The suitability of the closure matters as much as the body: a compatible bottle can still be the wrong system if its liner is unsuitable.

Always use product-specific compatibility guidance. DWK's laboratory essentials overview describes why laboratories use different materials for different applications.

Choose liquid-handling tools as a system

Define the working volume range and how often each volume is used. Ask whether the tool, tip or dispenser is intended for the liquid and technique in your method. A comfortable grip, readable setting and straightforward maintenance process can make a meaningful difference over a long session. Document the exact tip specification if it is part of the validated setup.

A tip's fit can influence performance. See Eppendorf's study of pipettes and tips (PDF) for an example of this interaction.

Plan service before equipment arrives

Before ordering a balance, meter or other instrument, confirm the available space, power supply, operating environment and service arrangements. Record who will accept delivery, who will check installation and where manuals and certificates will live. Agree the acceptance criteria before the instrument is unpacked, so a convenient first reading does not become the only test of whether it works.

Keep a named equipment record with the model, serial number, location, maintenance history and current status. A clear “ready”, “under review” or “out of service” label is more useful than relying on memory. Changes in room conditions, accessories or software may also need to be recorded, depending on the method.

The chemical store

Understand laboratory chemicals beyond the label

A chemical name identifies a starting point. The specification tells you whether that material fits your application.

When comparing laboratory chemicals, record the full name, identifying reference where appropriate, grade, concentration or assay, physical form, pack size and storage requirements. Two containers with a similar name may have different concentrations or impurity limits. Read the actual specification, rather than using price or a prominent purity figure as the deciding factor.

What chemical grades can tell you

Labels such as technical, laboratory reagent, analytical and application-specific describe intended uses or specifications, but the exact meaning depends on the supplier and standard involved. Compare stated limits and test methods. A material suitable for a general preparation may be unsuitable for a measurement that is sensitive to a particular trace impurity.

Ask which properties your method depends on. Is water content important? Does the method require a particular solvent grade, a certified concentration or a limit on a named contaminant? Put those requirements in the buying brief. A higher headline purity is not automatically a better choice when it does not address the property being measured.

A safety data sheet does not replace the workplace assessment of how a chemical will be used. HSE makes that distinction explicitly in its guidance on chemical safety data sheets. Keep the current document accessible to the people carrying out the task.

Build a useful chemical inventory

A practical inventory connects the container on the shelf with the information needed to manage it. Record the supplier, catalogue reference, batch or lot identifier, quantity, location, date received and any opening or review date required by your procedure. Make ownership clear so that a half-used bottle does not become an unexplained permanent resident.

Review inventory against planned work before placing another order. Smaller appropriate packs can reduce unused stock and make it easier to maintain current documentation. Plan how the container will be identified after repeated handling, and how a transferred portion will retain the information needed by the next person.

Plan handling, storage and disposal together

Assess the actual task, the people who could be exposed and the controls needed. Storage arrangements, cleaning and waste handling belong in that assessment. Incompatible materials may require separation; a shared alphabetical shelf is not a compatibility system. Follow the product documentation and the laboratory's assessed procedures for the specific materials involved.

For the assessment process, use HSE's COSHH assessment guidance. This guide does not provide recipes, chemical mixing instructions or a substitute for task-specific training.

From reading to result

Make laboratory measurements meaningful

A result needs context: what was measured, how it was measured and how much confidence the method supports.

Scientific equipment produces readings. A laboratory turns those readings into usable results through a defined method, suitable references and clear records. Specify the unit, sample identity, instrument and relevant conditions alongside the value. Consistent recording makes it easier to compare work across people, days and locations.

Resolution, repeatability and uncertainty

Resolution concerns the smallest displayed increment or discernible change. Repeatability describes agreement under the same specified conditions. Measurement uncertainty addresses the spread of values reasonably associated with the result. Extra digits on a display do not, by themselves, establish a smaller uncertainty.

For a fuller explanation of uncertainty, start with the National Physical Laboratory's beginner's guide.

Keep calibration and routine checks distinct

A calibration establishes a relationship between an instrument's indications and reference values under stated conditions. A routine check asks whether the instrument continues to meet the laboratory's needs between calibrations. Both can be useful, but one should not be relabelled as the other. Choose check criteria and intervals appropriate to the use and the consequences of an error.

Before requesting calibration, explain the working range, required uncertainty and reporting needs. A certificate that covers the wrong range may offer little help for the actual method. Keep the certificate with the instrument record, and review what its results mean for continued use.

Leave a record another person can follow

A good worksheet connects the sample, equipment, materials, observations and final result. Record relevant deviations at the time rather than tidying them away later. If a calculation or spreadsheet contributes to the report, identify the version used and the checks applied to it. The aim is a clear account of the work, not a document that only its author understands.

Think about how the result will be used before collecting it. A pass/fail decision, a trend chart and an exploratory comparison can need different reporting detail. Agree the acceptance rule and any treatment of uncertainty with the people who will act on the result, rather than deciding after seeing the numbers.

The UK laboratory landscape

Find the right laboratory for the question

A useful laboratory enquiry describes the problem precisely enough for the laboratory to propose an appropriate method.

UK laboratories support education, manufacturing, environmental monitoring, materials development and many other areas of science. A university facility may support exploratory work; a contract testing laboratory may provide defined measurements for clients; an in-house quality team may monitor an established process. These are different working arrangements, so start with the service and outcome you need.

Write a clear testing brief

Describe the material or sample type, the property you want measured and the decision the result must support. Include expected ranges, the number of samples and any timing constraints. Ask the laboratory about sample quantity, container requirements, transport conditions and acceptance criteria before sending anything. A sample that arrives without the necessary context can delay the work even when the instrument is available.

Agree how the laboratory will report results, any uncertainty or detection limits relevant to your decision, and whether work will be subcontracted. Clarify what happens to remaining material, how records are retained and who can answer a technical question about the report. A quoted turnaround time should be understood alongside the sample acceptance and preparation process.

Check the scope of accreditation

UKAS accreditation to ISO/IEC 17025 concerns the competence of testing and calibration laboratories for the activities in their scope. Check the current published schedule against the specific material, measurement or method you need. A laboratory's accredited activity does not automatically cover every service on its website.

UKAS explains this in its overview of ISO/IEC 17025 laboratory accreditation. AMP Science is an educational resource and does not claim laboratory accreditation or offer testing services.

Put UK purchasing details in the specification

For equipment and supplies delivered to a UK laboratory, confirm the delivery address, receiving hours, installation needs, documentation language and service arrangements. Ask whether replacement consumables and support are available on the timescale your work requires. Include VAT treatment, carriage, installation and ongoing servicing when comparing written quotes.

For chemical supply, clarify which regulatory regime applies to the destination. Great Britain and Northern Ireland do not have identical REACH arrangements; HSE's explanation of UK REACH describes the distinction. Check current official guidance for the transaction rather than assuming that “UK delivery” answers every documentation question.

Make receiving stock part of quality control

On arrival, compare the delivery with the approved order and record any damage, mismatch or missing paperwork. Follow the agreed process for putting items into use or setting them aside for review. Keep delivery and batch information connected to the inventory record. Receiving is the point where a purchasing specification becomes a physical item on the bench.

A quick reference

Useful laboratory language

Acceptance criteria

The requirements an item or result must meet before it is accepted for its intended use.

Batch or lot

An identifier linking a defined group of material to its production or supply records.

Calibration

Establishing the relationship between instrument indications and reference values under specified conditions.

Compatibility

Whether materials, equipment and conditions are suitable together for the intended task.

Consumable

An item used up or routinely replaced during laboratory work.

Method

A defined approach to carrying out a task or making a measurement.

Specification

The documented characteristics or limits used to describe what is required or supplied.

Tolerance

A permitted variation against a stated specification; it is not the same as measurement uncertainty.