Read the sample identity first

When a test report arrives, do not start with the conclusion; start with what was tested. The first page should name the sample, its size, thickness, resin type, production batch, the party that submitted it and the date. If any of these is missing, the link between the report and the delivered product cannot be established.

A common trap is a report that says only FRP grating, with no thickness, no bearing bar depth and no resin type. Such a report proves that some product was tested; it does not prove that the batch you bought reaches the same level.

Read the type of report as well: type test, factory test or commissioned test. A type test covers the full performance set, a factory test covers routine items, and a commissioned test is responsible only for the sample submitted. Project acceptance normally asks for a type test report plus factory test records for the batch. For the full list of specification parameters, see the FRP grating specification guide

Load reports: span, load and deflection

The core of a load report is not a single number but a set of conditions: span, support width, load type, load value and the deflection that goes with it. The uniform load printed in a catalogue almost always belongs to one particular span and one deflection limit, and the number means nothing without them.

Find the span first. On the same panel, going from a one metre span to one and a half metres cuts the allowable load sharply, because deflection rises with the fourth power of the span. A report that gives a load without a span cannot be used for design.

Then read the deflection limit. Capacity and deflection limit are two different things: the looser the allowable deflection, the higher the load in the table. Walkway grating commonly uses span divided by 160, or a quarter of an inch, whichever is smaller, and two reports can only be compared once the basis is the same. For how support spacing is set, see FRP grating support spacing

Common misreadings of load reports

The first misreading is to treat the failure load as the allowable load. The failure load is the maximum the specimen carried before it broke, and the allowable load is that value divided by a safety factor; the two differ several times over, and confusing them makes the structure unsafe.

The second is to ignore the support width. The width of the bearing area changes how the panel actually carries load, and a narrow support can crush the panel end before the mid-span fails. The report should state the support width used in the test.

The third is to convert a concentrated load into a uniform load. The two fail in different ways, because a concentrated load creates high local stress under the loading point and cannot simply be spread over the area. A platform that must take a concentrated load needs the matching concentrated load test data.

Fire reports: standards and indices

A fire report has to be read against its standard. The common ones are ASTM E84, EN 13501-1, GB 8624 and UL 94, and each measures something different, so the classes do not convert. ASTM E84 reports flame spread and smoke developed indices, while EN 13501-1 assigns a class from A to F.

The report should also state the thickness and resin system of the tested item. Fire performance depends directly on thickness, resin content and the level of flame retardant, so data for a thin panel cannot be applied to a thick one, or the other way round.

Burning droplets and smoke toxicity are often overlooked. Escape routes and enclosed spaces need smoke density and toxic gas data as well as flame spread, and these are usually listed separately in the report, so each has to be checked.

The limits of a fire report

Flame retardant does not mean non-combustible. FRP is an organic material, and reaching a flame spread class only shows that flame travel was suppressed under the specific test conditions; it does not mean the material takes no part in a real fire.

A report cannot replace a structural check either. Resin softens in a fire and capacity falls, so a platform with a fire requirement has to be checked with the derating factors for the fire case, not only against its flame class.

Watch the edition and age of the report too. Once a standard is revised, an old report may no longer apply, and after a formulation change the original report no longer represents the current product. At acceptance, check that the report edition matches the product formulation.

Slip reports: the method sets the number

Slip reports are the easiest to misread, because different test methods produce numbers that cannot be compared. The pendulum method gives a friction coefficient, the ramp method gives an R class or an A, B, C class, and the two measure grip under different conditions.

DIN 51130 uses an oiled ramp and a standard boot and reports R9 to R13; DIN 51097 uses bare feet and soap solution and reports A, B or C. R values and A, B, C do not convert, and a pendulum figure cannot be used to infer an R class.

Read the test conditions: whether the contaminant is water, oil or soap, what the slope is, and whether the sample was dry or wet. The same panel can differ by several classes between dry and oily conditions. For how surface type relates to test method, see FRP grating anti-slip surfaces

Matching the report to the delivered batch

A report that does not match the batch is the most common acceptance problem. The report describes a sample submitted in one month, while the delivered batch was made at another time, and the resin supplier or the formulation may have changed in between.

Check by comparing the batch number, production date and specification on the report with the packing list and the warranty certificate. Batch numbering is set by the maker, so the buyer should require traceable batch numbers in the contract and record them at every delivery.

Where the maker cannot show the batch link, ask for additional sampling and testing, or agree third-party sampling in the contract. Test items follow the service conditions, with load and fire normally mandatory and slip added or dropped to suit the site.

Common omissions and what to ask

The usual omissions are: no span or support width, no deflection limit, no sample thickness or resin type, no standard edition, and no issue date or laboratory accreditation. None of these stops a report from looking official, but any of them can make it unusable for acceptance.

Ask specific questions. Do not ask whether a test report exists; ask which report covers this batch, what span and deflection limit it used, and which edition of which standard the fire class follows.

Put the questions into a list and confirm each one in writing. Verbal assurances carry no weight at acceptance; only the figures written into the contract can be enforced.

• The batch number and production date the report covers.
• Span, support width and deflection limit of the load report.
• Standard, edition and class of the fire report.
• Test method and test conditions of the slip report.
• Laboratory accreditation and report issue date.
• Sample thickness, resin type and surface finish.

Putting reports into the acceptance file

A report is not an accessory to the purchase; it is part of the acceptance file. The contract should state which reports are required, which batches they cover, who issues them, when they are submitted and what happens if they do not comply.

At acceptance, compare the report with the goods: whether thickness, colour, surface finish and edge treatment match the description, and pause installation if they do not, until the reason is clear.

Remember the limits of any report: it proves how the submitted sample performed under specific conditions, not that every delivered panel matches, and it says nothing about installation quality or service life. Report, batch record and site inspection together form the complete chain of quality evidence.