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Product typeAutomotive aftermarket in glass care; other car care: Car Washes, Waxes, Bug & Tar Removers, and Headlight Restoration Kits.
OwnerITW Global Brands, division of Illinois Tool Works (ITW)
Introduced1972 (1972)
Previous ownersPennzoil-Quaker State Company dba SOPUS Products
TaglineOutsmart the elements®

Rain-X is a synthetic hydrophobic surface-applied product that causes water to bead, most commonly used on glass automobile surfaces. It was introduced in 1972 by Howard G. Ohlhausen of the Unelko Corporation. [1]

The brand has since been extended to a range of automotive and surface care products, including wiper blades. It is currently owned by ITW Global Brands.[2]


The Rain-X brand includes seven categories of products: wiper blades, glass and windshield treatments, plastic cleaners, windshield washer fluid, car washes, car wax, and bug and tar washes.[3]

Rain-X Online Protectant was introduced to carwashes in 2005.[4] It is a water-based compound that is applied to the entire car's surface, working much like consumer grade Rain-X products.

Competing products include Pittsburgh Glass Works' (formerly of PPG) Aquapel.


Effect of Rain-X original on a glass surface

Due to its general water repellent properties, the original Rain-X formulation is used in a wide variety of consumer, commercial and industrial settings. The primary use of Rain-X is for automotive applications. Commercially sold "Original Glass Treatment" is the original and most well known Rain-X branded product. It is a hydrophobic silicone polymer[5] that forces water to bead and roll off of the car, often without needing wipers. It is sold in 3.5 or 7 oz. bottles, or as wipes or towelettes.

The original coating has also had use in military and other government settings. The Australian military examined the effect of application of Rain-X and similar products to submarine antennae to improve signal transmission, although other coatings had longer lifespans when submerged in salt water.[6]

It is also occasionally used in laboratory settings to silanise a surface.[7][8][9]

Ski and snowboard enthusiasts use Rain-X as "wax" to effectively overcome sticky wet snow common in spring conditions. While skiing or riding on mountains with hard snow pack, the heat of the sun changes snow conditions starting on the lower slopes. Skis may suddenly slow down, throwing one off-balance, because of a change in surface tension, a sort of "sandpaper effect." Rain-X is applied to the ski or board base, or to the bottoms of ski boots to reduce, or eliminate snow "wedges" that interfere with proper mounting into ski bindings.[10]


Rain-X's primary active ingredient are polysiloxanes, the primary one being hydroxy-terminated polydimethylsiloxane.[11] The polysiloxanes have functional groups that bind to the hydroxyl group of the glass surface.[12] Rain-X's submitted safety documents state that Rain-x is a composition of acetone and water, but the exact ratio is a trade secret.


Rain-X was originally registered as a trademark in 1972 by Unelko and sold to Quaker State in 1997.[13][14]

Between 1997 and 2011 Rain-X was marketed by SOPUS Products, a subsidiary of Pennzoil-Quaker State[15][16], itself a subsidiary of Royal Dutch Shell. On March 1, 2011, Illinois Tool Works acquired SOPUS' car care business.[17][18][19]

In the UK, prior to 2010, Rain-X branded products were distributed by the SOPUS subsidiary Auto Expressions. On June 9, 2010, Kraco Enterprises acquired the company.[20][21]

Industrial Rain-X products were produced by Ecolab and used in carwashes and other industrial applications.[22][4] Ecolab sold its vehicle care business to Zep, Inc. on December 1, 2012.[23] The sale also included the Armor All Professional, Black Magic, Blue Coral, Niagara National, Washtronics, and Zep Enviroedge brands.[23]


  1. ^ "Brand Overview". Justia Law website. Retrieved 2 April 2018.
  2. ^ "Brand Overview". ITW Global Brands website. Retrieved 20 March 2017.
  3. ^ "Site Map". Rainx.com. Archived from the original on 20 January 2008.
  4. ^ a b "Ecolab Introduces New Rain-X® for Wheels for the Professional Car Wash Industry". Ecolab. 6 December 2010. Retrieved 8 December 2014.
  5. ^ Whitten, Kenneth W. & Davis, Raymond E. & Peck, M. Larry & Stanley, George G. (2009). Chemistry. Cengage Learning. p. 459.CS1 maint: uses authors parameter (link)
  6. ^ Dimas, Jim & Scardino, Andrew J. & Lewis, John A. "Enhancement of Drain-Down Capabilities of Submarine Antennae". DSTO-TR-2012.CS1 maint: uses authors parameter (link)
  7. ^ Pierce, Scott M.; Chan, Kwaichow B.; Zhu, Heping (2008). "Residual Patterns of Alkyl Polyoxyethylene Surfactant Droplets after Water Evaporation". Journal of Agricultural and Food Chemistry. 56 (1): 213–9. doi:10.1021/jf072372y. PMID 18069796.
  8. ^ Otobe, K. (2001). "Behavior of DNA fibers stretched by precise meniscus motion control". Nucleic Acids Research. 29 (22): 109e. doi:10.1093/nar/29.22.e109. PMC 92573.
  9. ^ Cong, Hailin; Hu, Xudong; Radosz, Maciej; Shen, Youqing (2007). "Brominated Poly(2,6-diphenyl-1,4-phenylene oxide) and Its Silica Nanocomposite Membranes for Gas Separation". Industrial & Engineering Chemistry Research. 46 (8): 2567. doi:10.1021/ie061494x.
  10. ^ James M Schaefer,"Sliding in Spring Snow," Snow Pro -- The Official Publication of the Professional Ski Instructors of America Educational Foundation, Albany, NY, forthcoming.
  11. ^ http://householdproducts.nlm.nih.gov/cgi-bin/household/brands?tbl=brands&id=21003001
  12. ^ Timothy Michael Shea,. "Durable hydrophobic surface coatings using silicone resins". US Patent 7344783 B, description 4.CS1 maint: extra punctuation (link)
  13. ^ "Our Company". Unelko.com. Archived from the original on 27 April 2010.
  14. ^ "Registration statement, Serial # 72416424, registration # 0960701". U.S. Patent and Trademark Office.
  15. ^ SEC filings, 18 June 2007 - EX-4.7 of S-8 POS for Royal Dutch Shell plc
  16. ^ http://www.quakerstate.com/#/about-quaker-state
  17. ^ "Illinois Tool Works Acquires SOPUS Products' Car Care Business". News release. PRNewswire via COMTEX -- ITW website. 1 March 2011. Retrieved 20 March 2017.
  18. ^ "ITW Global Brands website". Retrieved 20 March 2017.
  19. ^ "Illinois Tool Works website". Retrieved 20 March 2017.
  20. ^ "Kraco Enterprises to Acquire Auto Expressions from Shell Oil Company". Motor Sports News Wire. 9 June 2010. Retrieved 20 March 2017.
  21. ^ "Home page". Rain-X UK.
  22. ^ "Vehicle Care". Ecolab.com. 23 February 2009. Archived from the original on 23 February 2009.
  23. ^ a b "Zep Inc. Completes Acquisition of Ecolab's Vehicle Care Division". Zep, Inc. 3 December 2012. Archived from the original on 10 December 2014. Retrieved 8 December 2014.

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