Start with the real buying decision: opening spray, retained spray, or a different test
For 200gsm brushed polyester beach blankets, “AATCC 22 pass” is incomplete. A usable requirement needs at least seven decisions: the minimum initial spray rating, the minimum retained spray rating after laundering, the exact laundering procedure, whether any heat reactivation is part of the agreed care cycle, which face is tested, how shipment units are sampled, and how many laboratory specimens and panel ratings form the acceptance decision.
AATCC 22 measures surface wetting resistance under a controlled spray challenge. It does not measure hydrostatic head, pressure leakage, water penetration through seams, reverse-side wet pickup, or sit-on-wet-ground performance. If the buyer concern is damp sand, wet grass, or deck moisture transferring through the blanket, a backing or laminate and pressure-based testing are usually more relevant than pushing a brushed face from 80 to 90. See picnic blanket backing PEVA vs PU vs TPU, TPU laminated picnic mat hydrostatic resistance and PU3000 picnic blanket hydrostatic performance.
For resort programmes, the useful question is usually: what spray rating remains after the agreed wash-and-dry cycle that reflects actual housekeeping or guest care? A fresh-only result can hide weak cure, low finish add-on, print interference, pile distortion, or poor durability. Bulk release should therefore separate opening performance from retained performance.
Performance targets should follow the claim and the risk tolerance. A programme sold only as “quick shake-dry, light splash resistance” can accept lower retained spray than a programme marketed as “water-repellent beach blanket”. If the retailer or resort intends product copy, hangtags, or e-commerce bullets to mention water repellency, the retained threshold needs to sit high enough that guest perception still supports the claim after normal care.
For broader fabric-platform decisions, buyers often benefit from comparing DWR expectations against other outdoor constructions before fixing the PO. Related references include sand-free beach mat construction, camping ground mat construction and choosing picnic beach camping mat.
AATCC 22 grading scale: publish the exact descriptors, especially 50 versus 0
Commercial teams often blur the lower grades, but the distinction matters in disputes. Buyers should write the requirement in plain language that matches the AATCC 22 visual descriptors used by the testing lab.
Use the rating wording correctly: 100 = no sticking or wetting of the upper surface; 90 = slight random sticking or wetting of the upper surface; 80 = wetting of the upper surface at spray points; 70 = partial wetting of the whole of the upper surface; 50 = complete wetting of the whole of the upper surface on the entire specimen face; 0 = complete wetting of the whole of the upper and lower surfaces. Grade 50 and grade 0 are not interchangeable.
The difference between 100 and 90 is commercially useful on brushed polyester. A specimen can fall from 100 to 90 because of fibre lift, brushing variability, handling contamination, or small finish non-uniformity while still presenting visible beading and acceptable user perception. That is why many buyers set 90 minimum initial rather than insisting on 100 for a soft, brushed-face construction.
The difference between 80 and 70 becomes more sensitive after washing. Grade 80 confines wetting mainly to spray points. Grade 70 shows broader wetting across the specimen face and usually looks visibly damp. For a blanket sold as water-repellent but not waterproof, retained 80 supports a stronger claim, while retained 70 is better treated as an economy or lower-risk threshold.
Do not write “pass AATCC 22” without naming the required grade at each stage. The method has no universal pass mark. A result of 70 can be acceptable for a value programme with no strong repellency marketing and unacceptable for a resort line carrying guest-facing water-repellent claims.
Choose targets by use case, not by habit
Blanket buyers often write targets such as “90 initial, 70 after 5 washes” with no logic attached. That creates avoidable arguments. The target should reflect the claim level, finish chemistry risk, care route, and the commercial cost of failure.
Decision table: Brushed-face only, unprinted, guest-use blanket — typical buy point 90 initial / 80 after 5 TM135 cycles if the blanket will be sold or described as water-repellent and laundering is moderate; 90 / 70 only if the claim language is softer and the buyer accepts visible wetting growth after care. Printed-face or panel-printed blanket — keep 90 initial on unprinted ground, then agree either the same threshold on printed zones or a separate printed-zone minimum such as 80 initial / 70 retained if print binder is known to reduce surface repellency; do not average printed and solid areas together. Resort-laundry or rental programme — if the care route includes frequent wash and tumble drying at roughly 40–60°C, many buyers shift from a 5-cycle screen to 10-cycle retention or specify a tighter retained minimum because finish loss will show faster in service.
For a premium resort line with guest-facing water-repellent copy, a practical starting point is AATCC 22 rating 90 minimum before laundering and 80 minimum after 5 agreed wash-and-dry cycles. This is stricter, but it gives more room for lot variation, shelf age, and real-user contamination before complaints start.
For a mid-market line where repellency is supportive rather than headline copy, 90 initial and 70 after 5 agreed cycles can be workable, provided product claims avoid waterproof language and the reverse side is not being sold as ground moisture protection.
For printed or heavily decorated blankets, do not promise the same retained rating blindly. Pigment print binder, sublimation preparation, soft-touch top finishes, silicone badge areas, or heat-transfer films can depress opening spray or wash durability. Development should generate separate data for solid ground and printed zones. Related process references include custom blanket decoration methods, digital sublimation printing on fleece and screen-printed beach blanket construction.
Define laundering fully: TM135 code, drying option, and whether heat reactivation is agreed care
If you specify retained spray rating after washing, identify the laundering method in full. “Warm wash” is not specific enough. Under AATCC TM135, the exact procedure code, wash temperature, load, detergent conditions, and especially the drying option materially affect DWR retention. A supplier and buyer can both say “TM135” and still test under different severity.
For development and approval, keep one exact protocol fixed across all lab submissions. A fully written example specification line is: “Retained spray rating to AATCC 22 on guest-contact brushed face after 5 cycles AATCC TM135, Procedure 1, warm wash, tumble dry low, evaluated in conditioned state; minimum rating 80.” If the buyer uses another TM135 code, write that exact code instead. The point is not that Procedure 1 is mandatory; the point is that the PO must name the code and drying route in full.
If the blankets will be laundered in-house by a resort, spa, or rental operator, TM135 may be a weak predictor. In that case, specify a house care simulation with wash temperature, detergent type, whether softener is allowed, drying method, and end-point conditioning. Institutional laundry with stronger chemistry or hotter tumble drying often causes faster repellency loss than domestic home care.
Heat reactivation must be explicit. If tumble drying is part of the agreed care cycle, and that tumble dry is known to restore some repellency, then it is legitimate to include that drying step before test evaluation because it matches use. What should not happen is an extra unagreed oven bake, ironing pass, or reheating step inserted only to raise the lab result. Buyers should state either “no reactivation beyond the agreed care cycle” or “reactivation permitted only through the specified tumble-dry step in the agreed laundering protocol”.
Keep test method and buying rule separate. The method tells the lab how to run and grade. The PO tells the lab how many cycles to run, what drying route counts, and what minimum rating is acceptable at each stage. That separation prevents inflated retained ratings through unagreed reheating.
Specimen counts: separate shipment units, lab specimens, and visual rating decisions
Many disputes happen because buyers mix up three different counts: shipment sampling units, laboratory specimens, and visual rating panel decisions. These are not the same thing and should not be written as if they are interchangeable.
Shipment sampling units are the finished blankets or fabric panels pulled from the production lot. For a lot up to roughly 10,000 pieces, a practical performance sample is 5 shipment units drawn across cartons, rolls, or pallet positions from the same PO line, colourway, and finish batch. If the lot is larger, highly promotional, or claim-sensitive, increase to 8 shipment units.
Laboratory specimens are the cut test pieces. For brushed-face DWR assessment, cut 2 specimens per shipment unit, typically from separate representative positions and not both from the same narrow edge area. On width-sensitive programmes, cut from left, centre, and right lane coverage across the overall sample set so that pad or tenter non-uniformity can be seen. Five shipment units at two specimens each yields 10 specimens.
Visual rating decisions are the actual AATCC 22 grade calls made against the standard photos or rating chart. Good practice is for each wetted specimen to be rated by at least two trained assessors. If the two ratings differ by more than one grade step, escalate to a third assessor and use the median grade. Buyers do not need to over-engineer this into a formal jury system, but the PO should require recorded individual grades where a result is borderline.
For printed blankets, do not cut all specimens from the easiest area. If printed and unprinted zones are both part of the claim, define separate specimen sets and report them separately. A solid ground pass does not erase a print-zone fail.
Bulk acceptance framework: PO-ready lot rule, retest rule, and borderline handling
If the article promises PO-ready guidance, the acceptance rule must be countable. The easiest structure is to define one performance lot as one PO line, one colourway, one production batch, one finish recipe, then apply the same specimen plan to initial and retained testing.
A workable buyer rule for this category is: sample 5 shipment units per lot; cut 2 specimens from each unit; test 10 specimens total for initial spray on the specified face. For retained testing, either test matched companion specimens or test a second specimen set washed under the agreed protocol. Rate every specimen individually.
Example bulk-acceptance language: Initial rating pass if at least 9 of 10 specimens meet or exceed the stated minimum and no specimen is more than one grade step below the requirement. Retained rating pass if at least 8 of 10 specimens meet or exceed the stated minimum and no more than 1 specimen is one grade step below. Any specimen more than one full grade below the limit is an automatic investigation trigger and normally a lot fail unless a documented specimen anomaly is confirmed.
Borderline disagreement rule: if the lot misses by exactly 1 specimen, and all failing results are only one grade step below the limit, permit one retest on a fresh set of 5 additional shipment units / 10 additional specimens from the same lot. Combine the original and retest data only if the PO says to do so; otherwise the retest stands alone. If the retest fails again, the lot fails. If the retest passes but failure clusters remain by width lane or printed zone, release only by buyer waiver with that risk documented.
Link performance release to but do not replace visual AQL. Sewing, shade, measurement, contamination, and packing can still run under the buyer’s normal inspection scheme such as AQL 2.5 major / 4.0 minor, while water repellency remains a separate release gate. See AQL 2.5 inspection checklist, AQL inspection for blanket programmes and blanket quality control inspection.
Failure consequences buyers should define before production starts
A supplier needs to know what happens if one stage passes and another fails. Without that, commercial teams end up renegotiating after goods are packed.
If initial passes but retained fails, the usual interpretation is that application or cure achieved opening repellency but durability is insufficient for the agreed claim. Typical consequences are lot hold, downgrade to a non-water-repellent SKU, relabelling to remove the claim, or buyer-approved price concession. Rewash-and-retest without a pre-agreed rule is weak practice because DWR usually does not improve through more washing.
If printed areas fail but solid areas pass, treat printed areas as a separate nonconformance if those printed areas are visible use zones. The supplier can only claim pass if the PO explicitly limited the test to the unprinted guest-contact face or excluded printed decoration zones. Otherwise, decoration has interfered with the agreed performance and the lot needs waiver, redesign, or claim reduction.
If only one width position is below target, do not average it away. One weak centre lane often points to pad pressure, pickup variation, finish solids control, tenter airflow, or line-speed drift. One weak selvedge lane may point to edge contamination or uneven chemistry distribution. The control action is process investigation and lane-based review, not simple data averaging.
If one colourway passes and another fails under the same nominal recipe, check dye/finish compatibility, softener choice, print pretreatment, and pile recovery by shade. Dark shades, cationic systems, or heavily softened programmes can show different wetting behaviour. Related colourfastness and finishing references include wash fastness for black fleece, rubbing fastness for red throws and brushed-finish fleece colourfastness risks.
Construction risk factors: separate what affects opening rating, wash durability, and lot consistency
Buyers often receive a broad list of variables such as brushing, chemistry, curing, and printing, but that is not operational enough for supplier control plans. Separate the variables by failure mode.
Opening spray rating risk factors: surface contamination from oils or handling, over-softening, poor pile lay, aggressive brushing that opens fibre structure, uneven shearing, incorrect tested face, crushed pile from compression, and decoration zones that mask the DWR. These variables mainly affect the fresh visual wetting pattern.
Wash-durability risk factors: low DWR add-on, incomplete cure, poor chemistry compatibility with print binder or softener, weak crosslinking, harsh detergent exposure, high drying heat, and a care route that differs from the development protocol. These variables mainly show up as the gap between initial and retained rating.
Lot-to-lot consistency risk factors: finish bath solids drift, pH variation, wet pickup variation across width, tenter speed fluctuation, fabric GSM drift, pile-height inconsistency, shade-based recipe changes, and operator changes between batches. These variables create lane effects, roll effects, or colourway effects in bulk data.
For supplier control plans, ask for at least: incoming GSM check, face identification control, finish recipe version control, wet pickup target by width, curing temperature and dwell record, first-off and last-off spray data, and separation of printed-zone versus solid-zone results where relevant. Broader sourcing references include blanket quality control inspection, custom blanket lead times and production controls and PFC-free water-repellent finish controls.
PO-ready clause buyers can paste into a blanket specification
Use wording that names the method, care route, tested face, counts, and consequences. Example clause: “Guest-contact brushed polyester face to meet AATCC 22 spray rating minimum 90 before laundering. Retained rating minimum 80 after 5 cycles AATCC TM135 Procedure 1, warm wash, tumble dry low, no reactivation beyond the agreed tumble-dry care step. Test lot defined as one PO line, one colourway, one finish batch. Sample 5 finished blankets, cut 2 specimens per blanket, rate 10 specimens total. Initial pass: 9/10 specimens at or above requirement, none more than one grade below. Retained pass: 8/10 specimens at or above requirement, maximum 1 specimen one grade below, none more than one grade below. Printed zones, if present in use area, to be tested and reported separately from solid ground.”
If the care route is not domestic, replace the TM135 line with the actual resort laundry protocol. If the claim is softer, the retained minimum may be reduced to 70, but the product copy should also be softened accordingly.
Add one commercial line on failure handling so the supplier cannot argue after bulk packing. Example: “Initial pass with retained fail constitutes nonconformance to durability requirement; buyer may reject lot, remove water-repellent claim, or accept against negotiated concession.”
If the product also needs pressure-based moisture protection, add a separate backing or laminate clause rather than trying to solve that through a higher AATCC 22 number alone. Related constructions include 190T shell picnic blankets with fill, 210D ripstop picnic blankets and 900D polyester picnic blankets with TPE backing.
Frequently asked
What is the correct AATCC 22 wording for grade 50 versus grade 0? Grade 50 is complete wetting of the whole of the upper surface on the specimen face. Grade 0 is complete wetting of the whole of the upper and lower surfaces. Buyers should not collapse these two grades into the same descriptor.
Is 90 initial and 70 after five washes always the right specification? No. That pair only makes sense if the claim language, care route, and risk tolerance support it. A premium resort line with guest-facing water-repellent copy is often better specified at 90 initial and 80 after 5 agreed wash-and-dry cycles. A softer marketing claim or lower-cost programme may accept 70 retained.
How should a PO distinguish shipment units, specimens, and rating panels? Shipment units are the blankets or fabric panels pulled from the lot. Specimens are the cut test pieces sent to the spray test. Rating panels are the trained assessors who visually assign the AATCC 22 grade. Write each count separately. A common framework is 5 shipment units, 2 specimens per unit, and at least 2 assessors per specimen.
Can a supplier tumble dry or heat the blanket before testing retained spray? Only if that heat step is part of the agreed care protocol. If tumble drying is included in the specified laundering cycle, it is legitimate because it reflects use. Extra oven heating, ironing, or separate reactivation added only to improve the lab result should be prohibited unless explicitly written into the PO.
What should happen if the solid area passes but the printed area fails? If the printed area is part of the visible use surface or carries the same water-repellent claim, treat it as a failure of the decorated zone. Report printed and unprinted areas separately and do not average them together unless the PO explicitly limits the claim to the unprinted area.
Does AATCC 22 replace AQL inspection? No. AATCC 22 is a performance test for surface wetting resistance. Visual defects, sewing, measurement, contamination, and packing should still run under the buyer’s normal inspection framework such as AQL 2.5 major and 4.0 minor, with spray performance treated as a separate release gate.
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