Why 3mm SBR backing gets singled out
For PAH review, the SBR backing is the first component to check because it is the rubber part most likely to contain process oils, recycled input, crumb rubber, or mixed-source filler. The fleece face, sewing thread, and woven carry strap are usually lower on the PAH risk list unless they include rubberised coatings or soft-touch plastic trims.
Entry 50 is not a blanket ban on PAHs in all consumer products. The restriction is targeted to rubber or plastic components of articles supplied to the general public where the component, in normal or reasonably foreseeable use, comes into direct and prolonged contact with human skin or the oral cavity, or short-term repetitive contact with human skin or the oral cavity. For sourcing teams, that means you should assess the exposed SBR surface and any exposed rubberised trims, not speak generically about the whole picnic mat without looking at construction and use.
The 8 PAHs normally reported by labs under Entry 50 are benzo[a]pyrene (BaP), benzo[e]pyrene (BeP), benzo[a]anthracene (BaA), chrysene (CHR), benzo[b]fluoranthene (BbFA), benzo[j]fluoranthene (BjFA), benzo[k]fluoranthene (BkFA), and dibenz[a,h]anthracene (DBAhA). Ask the lab to report each analyte exactly by name and abbreviation, each in mg/kg, rather than a summary statement.
On a typical 150 x 200 cm picnic mat with 220gsm fleece laminated to 3mm SBR, finished weight often lands around 1.3 to 1.9 kg. That number matters only because heavier rubber-backed mats usually have more rubber mass, more exposed edge area, and more handling during folding and carrying. Weight by itself does not create legal scope, but it does help buyers identify which builds deserve closer backing review. If you are benchmarking non-rubber alternatives, compare against picnic blanket backing PEVA PU TPU and 600d rPET Oxford picnic mats with 5mm XPE foam core.
Operational scope test: is the exposed SBR in or out
Buyers need a usable classification tool, not vague phrases. Use this yes/no checklist for the SBR component itself. Yes, likely in scope if the user normally grips the exposed SBR while unfolding, folding, carrying, shaking, or packing the mat; if the SBR edge rolls upward and contacts legs, arms, or hands repeatedly in normal use; if exposed SBR anti-slip patches, handles, or trim pieces are touched directly; or if the construction leaves the SBR exposed at the perimeter where it is handled each time the product is used.
No or weaker legal case if the rubber layer is fully enclosed inside another material and cannot be touched during normal or reasonably foreseeable use; if the user only contacts textile surfaces and there is no routine need to touch the rubber side; and if the edge construction fully covers the SBR so the rubber is not directly accessible. A supplier saying 'the rubber is on the bottom' is not enough. You need folded-state photos, edge photos, and a short use description showing how the product is handled.
For practical interpretation, many compliance teams treat routine hand contact during every use cycle as the stronger trigger for 'short-term repetitive contact', even if each touch is brief. A single incidental touch during warehouse handling is a weak case. Repeated gripping of the exposed underside during unfolding and refolding is a stronger case. That is an operational reading for sourcing decisions, not a substitute for legal advice, but it is usually enough to classify standard picnic-mat builds consistently.
If your answer is mixed, treat the build as commercially in scope and test it. Testing an exposed SBR-backed mat is usually cheaper than arguing borderline scope after a marketplace complaint, retailer challenge, or customs question.
The legal limit and what is only buyer control
The core Entry 50 acceptance point is straightforward: for the covered rubber or plastic component, each of the 8 listed PAHs must not exceed 1 mg/kg. Write that exactly in the material specification and in the lab request. Do not replace it with a generic phrase such as 'pass REACH'.
Separate that legal requirement from buyer controls. The law does not tell you how many finished mats to sample from a production lot, how long to retain samples, or whether to test both raw backing and finished article. Those are buyer risk-management measures used to reduce substitution and traceability failures.
Useful buyer controls include: testing the approved SBR sheet before production, testing finished bulk mats after lamination, requiring change notification before any compound or supplier switch, and keeping retained samples. Those controls are commercially strong because most failures are caused by silent material substitution, mixed backing lots, or undocumented recycled-content changes, not by misunderstanding the numeric limit.
If you need broader retailer files, keep them in separate sections: Entry 50 PAH results, any REACH Annex XVII screens beyond PAHs, and any retailer RSL or restricted chemistry package. That avoids mixing legal compliance with channel-specific requirements.
Risk ranking by backing source
Low to moderate risk: virgin SBR from a stable named compounder with a locked formulation, internal batch code, and lot-specific declaration. This is still not self-proving. You still need test evidence, but lot traceability is usually cleaner.
Moderate risk: virgin/recycled blended SBR where the recycler stream is defined and the compounder can state the recycled share, feedstock type, compound code, and batch history. This can be workable if the supplier maintains retained samples and issues formal change notifications.
Highest risk: crumb-heavy or mixed-source recycled rubber with generic 'black SBR' descriptions, no compound code, no batch record, or no willingness to disclose recycled input. These backings may pass one lot and fail the next. The weak point is usually feedstock variability, not SBR as a polymer family.
Red-flag supplier answers are predictable: 'all our products are REACH compliant' with no report attached; 'same as last order' with no batch reference; 'material secret' instead of a compound code; 'test on raw material not needed because final goods passed once'; or 'recycled content percentage may vary'. Treat those as triggers for tighter control or material rejection.
Test plan before PO issue
Use a two-layer plan. Layer 1: material approval. Obtain a third-party report on the exact SBR sheet or compound proposed for the order. The sample description should state: compound code, supplier or mixer name, production batch number, sheet lot number, nominal thickness such as 3.0 mm ±0.3 mm, colour, and whether recycled input is present.
Layer 2: finished-goods verification. Test mats taken from bulk production after lamination and cutting. This is not extra law; it is buyer control. It catches backing-roll substitution, mixed lamination lots, or changes in subcontracted foaming or calendering that a raw-sheet report will miss.
For the laboratory request, use precise wording: determine the 8 PAHs listed in REACH Annex XVII Entry 50 in the exposed SBR backing component by a validated method suitable for rubber/plastic materials, typically GC-MS, reporting each analyte individually in mg/kg with per-analyte LOQ. Ask the lab to identify the tested matrix, extraction basis, and sample preparation note.
If your product has other exposed rubber or soft-touch plastic parts such as grip handles, corner patches, or rubber logo badges, list them separately in the test request. Entry 50 applies to the component in contact, not just the main backing sheet.
Sampling plan buyers can actually run
Define the lot first. A practical lot for this product is finished mats made from the same compound code, same SBR batch or sheet lot, same lamination lot, same factory, and same production date window. If any of those change, treat it as a new lot for buyer control purposes.
For a single-lot order up to roughly 5,000 pcs, a workable commercial plan is: 1 raw backing sample from the approved SBR lot before mass production, then 3 finished mats sampled at random from early, middle, and late packing, composited or tested as the lab advises for the SBR component. For orders above 5,000 pcs, many buyers step up to 1 finished-mat PAH test per backing or lamination lot, or at minimum one per production day where traceability is weak.
If bulk uses more than one backing roll lot or more than one lamination lot, do not sample only one carton. Sample each distinct lot. If the factory cannot segregate cartons by backing lot, that is a traceability failure and should trigger either 100% lot hold or widened testing.
Retest should be mandatory, as a buyer control, after any change to compound code, rubber supplier, recycled-content declaration, colour masterbatch, oil package, foaming ratio, sheet plant, lamination adhesive system, lamination subcontractor, or backing thickness outside agreed tolerance. A new roll from the same documented sheet lot usually does not need a new approval test; a new undocumented batch does.
During final random inspection, pair the chemistry file with normal physical checks. On picnic mats we typically also confirm size tolerance ±2 cm, fleece GSM tolerance about ±5%, SBR thickness tolerance about ±0.2 to 0.3 mm, edge sewing continuity, delamination, odour, and pack count. If you use an inspection level such as AQL 2.5 for visual and workmanship review, keep that separate from the chemical pass/fail decision. For general QC structure, see AQL 2.5 inspection checklist and blanket quality control inspection.
Documents to lock before deposit and before shipment
Before deposit, the supplier file should include: technical spec sheet; bill of materials; SBR compound declaration; pre-production PAH report; and signed change-control undertaking. A proper SBR declaration should state at least: supplier name, factory address, compound code in a controlled format such as SBR-3.0-BLK-C24-01, nominal thickness, recycled-content statement, batch number, production date, and signature by an authorised quality manager.
Before shipment, add: finished-mat production PAH report; packing list cross-referenced to lot numbers; lamination record; carton-to-lot traceability sheet; final inspection report; and retained-sample record. For retained samples, a practical buyer requirement is minimum 12 months from shipment, and often 24 months for EU private-label programmes.
Your change-notification clause should require written notice before production for any material or process change affecting the SBR component. Reasonable notice is often 30 days for ongoing programmes and immediate notification if the change is discovered during production. No shipment should proceed against a changed backing without written buyer approval.
If the programme also needs other compliance files, keep them clearly separated by topic. A recycled-content certificate does not prove PAH compliance, and a PAH report does not validate recycled claims. If you are evaluating alternative outdoor builds with non-rubber waterproof layers, see 145gsm nylon parachute picnic blankets with PU3000 coating hydrostatic and 370gsm recycled polyester sherpa picnic blankets with 210D PU backing.
PO appendix wording you can use
Use wording that ties the test result to the shipped lot. A workable clause is: The exposed SBR backing and any other exposed rubber or plastic component of the picnic mat that may, in normal or reasonably foreseeable use, come into direct and prolonged contact with human skin or short-term repetitive contact with human skin shall comply with REACH Annex XVII Entry 50. Each of the following analytes shall be not more than 1 mg/kg: benzo[a]pyrene, benzo[e]pyrene, benzo[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[j]fluoranthene, benzo[k]fluoranthene, dibenz[a,h]anthracene.
Continue the clause with the control language: Supplier shall provide a third-party test report on the approved SBR backing lot before mass production and a third-party test report on finished production mats from each backing or lamination lot used for this purchase order. Reports shall identify sample description, compound code, sheet lot, lamination lot, production date, analyte-by-analyte results in mg/kg, LOQ, laboratory method summary, and chain of custody. No material, formula, supplier, recycled-content level, colour, thickness, or lamination-process change may be made without prior written buyer approval.
Add a remedy line if your legal team allows it: Shipment documents shall cross-reference the tested lots, and buyer may reject, hold, or require replacement of any lot lacking matching traceability or compliant test evidence. That turns the compliance appendix into an enforceable receiving tool rather than a generic statement.
What good and bad evidence looks like
Good evidence: report names the SBR component clearly; analytes match Entry 50 naming; per-analyte results are shown; LOQs are stated; the sample description ties back to the production lot; and the backing compound code on the declaration matches the code on the report and internal BOM.
Weak evidence: certificate says only 'REACH passed'; report lists a mixed screening package without identifying Entry 50 analytes; no lot or batch reference; no distinction between raw backing and finished article; or the report sample is older than the current compound revision.
If the supplier refuses to give a compound code, cannot keep retained samples, or says the factory buys 'whatever black SBR is available', do not rely on a one-time passing report. Either move to tighter lot testing, redesign the construction, or shift to another backing system with cleaner traceability.
Frequently asked
Does Entry 50 apply automatically to every SBR-backed picnic mat? No. The restriction is tied to the rubber or plastic component of an article supplied to the general public where that component, in normal or reasonably foreseeable use, comes into direct and prolonged contact with skin or the oral cavity, or short-term repetitive contact with skin or the oral cavity. For picnic mats, the main practical question is whether the exposed SBR backing or rubberised trims are routinely touched during use, folding, carrying, or packing.
What are the exact 8 PAHs to ask the lab to report? Ask for benzo[a]pyrene (BaP), benzo[e]pyrene (BeP), benzo[a]anthracene (BaA), chrysene (CHR), benzo[b]fluoranthene (BbFA), benzo[j]fluoranthene (BjFA), benzo[k]fluoranthene (BkFA), and dibenz[a,h]anthracene (DBAhA), each reported individually in mg/kg.
What limit should buyers specify? For Entry 50 control of the covered component, specify that each listed PAH must be not more than 1 mg/kg. Write the analytes individually in the PO appendix and lab request rather than using only the phrase 'pass REACH'.
Should we test raw SBR sheet, finished mats, or both? The law sets the limit, not the sampling structure. As a buyer control measure, testing both is stronger: raw-sheet testing helps approve the compound before bulk, and finished-mat testing confirms the shipped build still matches the approved material after lamination and cutting.
How many mats should be sampled from production? A workable buyer control for a single lot up to about 5,000 pcs is one pre-production SBR backing sample plus three finished mats taken from early, middle, and late packing. If bulk uses more than one backing or lamination lot, sample each distinct lot. Larger or higher-risk orders usually justify one finished-goods PAH test per backing or lamination lot.
What documents should the supplier provide besides the test report? At minimum: technical spec sheet, BOM, SBR compound declaration with supplier name and compound code, pre-production PAH report, finished-goods PAH report, lot traceability sheet, lamination record, change-notification undertaking, and retained-sample record. A generic declaration without batch or compound identification is weak evidence.
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