ACRYLITE AR2 (Optical Mar-Resistant) Acrylic for Boat Windows
Distributors sell hard-coated ACRYLITE AR2 as marine glazing at two to four times the price of plain sheet. The maker's own data sheet says it is an indoor product with outdoor life typically limited to three years, it cannot be heat-formed or flame-polished, there is no warranty, and Polyvantis's boat-window advice is to use cast sheet instead. Excellent behind a store counter; the wrong sheet for a hatch.
By Sergio Igartua, Founder & Editor · Updated · How we research
Key facts
- Polyvantis makes ACRYLITE AR2, now named ACRYLITE Optical mar resistant, an extruded acrylic sheet hard-coated on both sides.
- Polyvantis states that outdoor use of the sheet is typically limited to three years and publishes no warranty for it.
- Polyvantis does not recommend thermoforming or flame-polishing ACRYLITE AR2.
- A 48 × 96 in sheet of 1/4 in AR2 cost $522 to $946 in September 2026, against about $259 for plain extruded sheet at the same retailer.
- AcrylicWindow.com rates ACRYLITE AR2 2.6 out of 5 for boat windows and recommends cast acrylic sheet instead.
Pros
- Coating holds haze under 2 percent at 100 Taber cycles and shrugs off acetone, MEK, and toluene that mark plain acrylic in minutes
- Windex and 409 are approved cleaners on the coated face, which no plain acrylic can say
- 92 percent light transmission and no measurable yellowing after 3,000 hours of xenon-arc weathering
- Stocked at A&C, ePlastics, and Curbell in 48 × 96 sheets from 1/8 to 1/2 inch
Cons
- Polyvantis rates it for indoor use; outdoor exposure is 'typically limited to three years'
- ICC-ES ESR-1260 limits it to interior applications
- No thermoforming, no line bending, and a cold-bend radius of 330 times thickness, so no curved windshields or domed hatch lenses
- Flame polishing crazes the coating; a gouge through the coat is permanent; scratches cannot be buffed out
- No published warranty; Lexan Margard MR10 carries ten years
- Two to four times the price of plain extruded sheet; the 40× claim dates from a 2001 brochure and has no published test basis
Specifications
| Maker | Polyvantis (ACRYLITE brand under license from Röhm; formerly CYRO, then Evonik and Röhm America), Sanford, Maine |
| Material | Extruded acrylic with a hard coat on one side (AR1/MR1) or both (AR2/MR2); current Polyvantis name is ACRYLITE Optical mar resistant, codes 0A000 MR1 and MR2 |
| Thickness | 0.060 to 0.472 in (1.5 to 12 mm); distributors stock 1/8, 3/16, 1/4, 3/8, 1/2 |
| Sheet size | 48 × 96, 60 × 96, 72 × 96 in; clear only |
| Light transmission | 92% (ASTM D1003, 3 mm) |
| Abrasion | Haze change under 2% at 100 Taber cycles (ASTM D1044); under 1% at 25 rotary brass-wool cycles; under 10% falling sand 3,000 g |
| Chemical resistance | Over 24 hours without visible attack in acetone, MEK, methylene chloride, toluene, sulfuric and nitric acid, versus under 15 minutes for uncoated acrylic (ASTM D1308) |
| Weathering | No significant transmission loss or yellowing after 3,000 h xenon arc (ASTM D2565); outdoor use typically limited to three years per the maker |
| Fire | CC2 (ICC-ES ESR-1260); ASTM D635 burn rate 1.0 in/min; UL 94 HB |
| Forming | Thermoforming and line bending not recommended; cold bend radius 330 × thickness; flame polishing not recommended |
| Warranty | None published |
| Price | 48 × 96 sheet, Sep 2026: 1/8 in $350–$594, 1/4 in $522–$946, 3/8 in $998, 1/2 in $1,332; plain extruded 1/4 in about $259 at the same retailer |
Polyvantis (ACRYLITE) is listed in our directory. See Polyvantis (ACRYLITE) in the directory →
Our Verdict
If you want a scratch-resistant surface on a flat panel that lives under a hardtop or inside the cabin, AR2 does that job well. For a hatch lens, a portlight, a windshield, or anything that lives in the weather, buy cast acrylic, which is what the sheet's own manufacturer tells boat owners to use, and keep the difference for a good cover. The product is fine; the marine label on it is a distributor's, not the maker's.
Overview
Search for "marine acrylic" and A&C Plastics' page for abrasion-resistant ACRYLITE comes up near the top, promising sheet "commonly used for marine windows, hatches, windshields" with "exceptional weatherability." We ranked it in our boat window roundup on that basis. Then we read the manufacturer's own documents, and this review is the correction.
The sheet is real and the coating is good. ACRYLITE AR, now sold by Polyvantis as ACRYLITE Optical mar resistant, is extruded acrylic with a silicone-type hard coat on one face (AR1, now MR1) or both (AR2, now MR2). CYRO Industries introduced it in the early 2000s using "the proprietary 3M 906 abrasion resistant coating, under license from the 3M Company," and the line survived CYRO's absorption into Evonik, then Röhm, then the 2024 merger that created Polyvantis. The US entity on the data sheet is POLYVANTIS Sanford LLC in Sanford, Maine, whose air permit lists a multi-functional coating line.
What the data sheet says about where to use it is the part the distributors leave out.
What the maker says
Technical data sheet 1970D, dated July 2024, lists the applications: picture framing, point-of-purchase displays, store fixtures, menu boards, museum and electronic displays, signs, furniture, security glazing, automotive interiors. Then: "ACRYLITE Optical mar resistant sheet is primarily intended for indoor applications... Use in outdoor applications is typically limited to three years of exposure."
The ICC Evaluation Service report on ACRYLITE sheet, ESR-1260, reissued in 2026, is blunter: "ACRYLITE Optical Mar Resistant may be used in interior applications only."
And when a boat owner asked Polyvantis's knowledge base how to bond acrylic windows to a fiberglass boat, the answer was: "Cast sheet is recommended for windows in a marine (boat) application," framed around the perimeter, sealed with DOWSIL 795 or GE SilPruf, with room for thermal movement. Not a word about the mar-resistant grade. The company that makes AR2 does not sell it for boats.
What the coating does
Inside those limits, the numbers are impressive. Haze rises less than 2 percent after 100 Taber cycles (ASTM D1044), where CYRO's 2001 chart puts uncoated acrylic at 20 to 30 percent. Under ASTM D1308 the coated face survives more than 24 hours in acetone, MEK, methylene chloride, toluene, and sulfuric and nitric acid, solvents that mark plain acrylic in under 15 minutes. Windex, Formula 409, Fantastik, and Glass Plus are approved cleaners on the coated side, which is unheard of for acrylic. Light transmission is 92 percent, and after 3,000 hours of xenon-arc weathering the sheet showed no significant transmission loss or yellowing.
The "40 times the mar resistance of uncoated sheet" line that A&C and Polyvantis both use traces to the 2001 CYRO brochure. No current document shows the test behind the multiplier, so treat it as a slogan sitting on top of a real Taber result.
Why it fails as boat glazing
Four reasons, all from the maker's documents.
It is not rated for the weather. Three years of outdoor life is the manufacturer's own figure. A boat window is outdoors for its whole life, on the sunniest surface of the boat, and often a coating-failure victim before the base sheet is. Nothing in the literature says what happens after year three, and there is no warranty to fall back on: the data sheet disclaims all of them. Lexan Margard MR10, the coated polycarbonate competitor, carries a ten-year limited warranty against yellowing, abrasion, breakage, and coating failure.
It cannot be formed. "Line bending or thermoforming... is not recommended" because the coating delaminates; the 2001 brochure adds that even "the forming of shallow domes will result in crazing of the coated surface." Cold bending is allowed at a minimum radius of 330 times thickness, which for a 1/4-inch sheet is about seven feet. That excludes wraparound windshields, curved dodger panels, and domed hatch lenses, which are exactly the boat parts that get scrubbed with salt on them. The pattern in owner reports on hard-coated polycarbonate is the same failure: five Hull Truth posters in one 2020 thread describe Makrolon AR2 enclosures that "started to all craze by year 4," especially "where bent."
It cannot be repaired. Plain acrylic's great marine virtue is that a season of wiper haze comes out with wet sanding and polish, as our scratch repair guide shows. On AR2 the coating is the surface; the maker says a razor or scraper strips it and "once the coating has been removed, it cannot be repaired." Flame polishing an edge "will cause the surface coating to crack or craze." Chemicals attack the cut edges and the uncoated face, so every edge on a boat needs to be sanded, buffed, and sealed, and a gouge from a dropped winch handle is permanent.
It costs two to four times plain sheet. In September 2026 A&C listed 48 × 96 AR2 at $361.50 (1/8 in), $522 to $690 (1/4 in), $997.50 (3/8 in), and $1,332 (1/2 in); Curbell had 1/8 in at about $350; ePlastics charged $594 and $946 for 1/8 and 1/4 inch. ePlastics' plain clear extruded sheet in the same sizes was $142 and $259, so the coating multiplies the price by roughly 2.5 to 4.5. That premium buys scratch resistance for three rated years on a panel that cannot be bent, polished, or warranted.
One more thing to know: nobody seems to have done it. Across the Sailboat Owners, Hull Truth, and YBW threads on boat glazing we could not find a single first-hand report of hard-coated acrylic on a hatch, portlight, or windshield. Every AR field report is about coated polycarbonate. The marine market has, in practice, voted with cast sheet.
Naming, so you buy the right thing
"AR2" on a distributor site usually means this product, but not always. Interstate Plastics lists an "AR2 cast" sheet, which cannot be ACRYLITE MR (an extruded product) and is probably another maker's. Plastic-Craft sells an "ACRYLITE Gallery AR-2 UltraClear" that is actually cast Gallery sheet with a fingerprint-resistant option. A&C's cheaper "/P" SKUs at the same thickness may come from a different mill; the site does not say. If you want the Polyvantis product, look for "0A000 MR2" or "ACRYLITE Optical mar resistant" on the data sheet the seller supplies. Plaskolite's AR-coated acrylic is a competitor, but it tops out at 0.118 inch and is also labelled indoor.
Where it belongs
Flat and under cover. A dash panel behind a hardtop, an instrument bezel, a sliding cabin window inside an enclosure, a chart-table cover, or the flat side panels of a pilothouse that a canvas cover protects at the dock. In those spots a coating that survives 409 and a wet rag full of grit is a real upgrade, and three rated years of sun is a conservative number for a shaded panel. Cut it with standard acrylic tooling, masking on, sand and buff the edges, and never put a flame near it.
What to buy for the weather
Cast acrylic. It is what Polyvantis tells boat owners to use, it bends, it edge-polishes, and a scratch sands out. Our cast vs extruded explainer covers the grades; sailboat owners in our boat window roundup used 1/4 inch for portlights and 1/2 inch for deck hatches, bonded with Dow 795. Boat Outfitters will cut flat pieces; a UPD Plastics windshield comes off a pattern. For a panel that takes screws and abuse, Piedmont's impact-modified PMG Ultra is warranted for ten years. And if a hard coat outdoors is the priority, buy it on polycarbonate with a warranty, knowing it will craze at bends.
Sources
- Polyvantis: ACRYLITE Optical mar resistant technical information, TDS 1970D, July 2024 (PDF), product page, and knowledge base: adhesive for acrylic windows on a fiberglass boat
- ICC-ES ESR-1260: ACRYLITE acrylic sheet (PDF)
- CYRO Industries: ACRYLITE AR abrasion-resistant sheet brochure, 2001 (PDF, hosted by TAP Plastics)
- Polyvantis: formation press release and Plastics Technology: Röhm, SABIC combine on new film and sheet unit
- Maine DEP air license, POLYVANTIS Sanford (PDF)
- A&C Plastics: abrasion-resistant acrylic, marine, category listing, marine page
- ePlastics: abrasion-resistant acrylic, 1/8 in clear extruded 48 × 96, 1/4 in clear extruded 48 × 96; Curbell Plastics: AR2 1/8 in 48 × 96
- Plaskolite: AR coated acrylic, US Plastic: Lexan Margard MR10, Interstate Plastics: AR2 cast, Plastic-Craft: ACRYLITE Gallery AR-2, Rainier Marine: window FAQ
- Owner reports on hard-coated glazing: The Hull Truth: Makrolon enclosures (2020), Sailboat Owners: Lexan for dodger windows (2016), Sailboat Owners: yet another window replacement material debate, The Hull Truth: flat windshield, polycarbonate or acrylic (2014)
Frequently asked questions
Is ACRYLITE AR2 acrylic good for boat windows?
Not according to its maker. Polyvantis's current technical data sheet (1970D, July 2024) says ACRYLITE Optical mar-resistant sheet, which distributors still call AR1 and AR2, is 'primarily intended for indoor applications' and that outdoor use 'is typically limited to three years of exposure.' ICC-ES report ESR-1260 restricts it to interior applications. Polyvantis's own knowledge-base answer on boat windows recommends cast acrylic sheet. The marine framing comes from distributors such as A&C Plastics, not from the manufacturer.
What is the difference between ACRYLITE AR1 and AR2?
AR1 is coated on one face, AR2 on both. Polyvantis now calls them 0A000 MR1 and 0A000 MR2 under the ACRYLITE Optical mar-resistant name; the AR labels are legacy CYRO and Evonik naming that A&C, ePlastics, Curbell, and TAP still use. Both are extruded acrylic, 92 percent light transmission, in 48 by 96 up to 72 by 96 inch sheets from 0.060 to 0.472 inch. For a window that will be cleaned from both sides, AR2 is the one that makes sense, and it is the one distributors stock in thick gauges.
How much does ACRYLITE AR2 cost?
In September 2026 A&C Plastics listed 48 by 96 inch AR2 at $361.50 for 1/8 inch, $522 to $690 for 1/4 inch, $997.50 for 3/8, and $1,332 for 1/2 inch; Curbell had 1/8 inch at about $350 and ePlastics charged $594 for the same 1/8 inch sheet and $946 for 1/4. Against plain clear extruded sheet at ePlastics ($142 for 1/8, $259 for 1/4), the coating costs roughly two and a half to four and a half times the base sheet.
Can you bend or thermoform AR2 acrylic?
No. The data sheet says thermoforming and line bending are not recommended because the coating delaminates, and the original CYRO brochure says even a shallow dome will craze the coated surface. The only allowed bend is cold, at a minimum radius of 330 times the sheet thickness: a 1/4 inch sheet needs a radius of about seven feet. That rules out wraparound windshields, curved dodger panels, and domed hatch lenses, which are exactly the boat parts where a hard coat would be most welcome.
Is the 40 times scratch resistance claim for ACRYLITE AR true?
It is old marketing. The '40 times the mar resistance of uncoated sheet' line first appears in CYRO Industries' 2001 brochure and Polyvantis repeats it today, but no current document shows how the multiplier was derived. What the data sheet does publish is a haze change of under 2 percent after 100 Taber cycles, versus roughly 20 to 30 percent for uncoated acrylic on CYRO's 2001 chart. The coating is genuinely hard; the specific number is a slogan.
Can you polish scratches out of AR2 acrylic?
No. Plain acrylic can be wet-sanded and buffed back to clear, which is one of its best marine qualities. On AR2 the hard coat is the surface, and the maker says that once the coating is removed it cannot be repaired and that a razor or metal scraper will strip it. A gouge through the coat is there for the life of the sheet. Chemicals also attack cut edges and the uncoated face, so edges must be sealed and finished without a flame.
What should I use instead of AR2 for boat hatches and portlights?
Cast acrylic sheet, which Polyvantis itself recommends for boat windows: ACRYLITE GP or Plexiglas G, 1/4 inch for portlights and 3/8 to 1/2 inch for deck hatches, bonded into frames with Dow 795 structural silicone and cut with room for thermal movement. Cast sheet can be bent, edge-polished, scratch-repaired, and costs a fraction of AR2. For a piece that takes real abuse, Piedmont's impact-modified PMG Ultra carries a ten-year warranty. If you want a hard coat outdoors, Lexan Margard MR10 polycarbonate is warranted for ten years.