Pressroom and fountain solution chemistry
Raw materials for the companies that blend lithographic pressroom chemistry: gum arabic for plate desensitizing, sodium benzotriazole for yellow-metal protection, and citric acid for pH.
Raw materials for the companies that blend lithographic pressroom chemistry: gum arabic for plate desensitizing, sodium benzotriazole for yellow-metal protection, and citric acid for pH.
P.A.T. Products has supplied raw materials into lithographic fountain solutions and pressroom chemistry for more than a decade. We sell to the formulators who blend the chemistry, not the finished concentrate to a printer.
A conventional fountain concentrate is built from a desensitizing gum, an acid and its buffer, a corrosion inhibitor, wetting agents and solvents, and a preservative. Three of those inputs come from us.
| Raw material | Identity | What it does in the pressroom |
|---|---|---|
| Gum arabic Types 4880 and 4915 | Acacia gum, CAS 9000-01-5, E 414, purified agglomerated spray-dried powder | Desensitizes the non-image areas of the plate so they hold water and reject ink. Also the active component of plate gums, finishers and etches |
| Sodium Benzotriazole 40% | CAS 15217-42-2, aqueous liquid, 39.5 to 41.0% | Films the copper and brass in the wetted parts of a recirculating dampening system |
| Citric acid, anhydrous | CAS 77-92-9, fine granular, 30 to 80 mesh | Sets and holds the acid pH a conventional concentrate works at |
Lithography puts image and non-image areas on one surface at the same level and separates them chemically. Gum arabic adsorbs onto the grained aluminum oxide of the open areas and holds a water film there, which is what makes those areas reject ink.
Type 4880 is the grade to open on and Type 4915 is the second. Both are purified spray-dried powders in agglomerated form, specified as fast soluble in cold water, so nothing has to be ground before the make-up tank. Country of origin is Germany. The grade table, the specification values, and the make-up figures are on gum arabic for lithographic fountain solutions.
A fountain solution is acidic water circulating continuously through metal. Benzotriazole and its sodium salt form a protective film on copper, brass and other yellow metals, which is what the wetted hardware in a recirculation and dampening system is frequently made of.
Sodium Benzotriazole 40% (CAS 15217-42-2) is the water-soluble sodium salt supplied as an aqueous liquid at 39.5 to 41.0 percent. It meters straight into a water-based concentrate with no dissolving step. The solid benzotriazole grade, 99% fine granular, suits a formulator who prefers to make up their own concentrate. Both, plus the tolyltriazole equivalents, are on corrosion inhibitors.
Citric acid sets the acid pH a conventional fountain concentrate runs at, and with its salts it buffers against the drift that comes from paper, ink and make-up water. We supply it anhydrous as fine granular, 30 to 80 mesh, CAS 77-92-9.
The same acid is worth pricing alongside the gum rather than separately. Both are commodity-scale inputs into the same concentrate, and a formulator buying them on one order gets one supplier, one set of documents, and one freight movement.
Conventional acid systems for sheetfed and web offset, gum-containing and alcohol-free alike.
End-of-run treatments that hold the desensitized surface through plate storage.
Corrective chemistry for open areas that have started taking ink.
Gum-containing rinse steps that return a plate to a desensitized state after solvent.
Every item ships with a product specification, a Safety Data Sheet, and a Certificate of Analysis for the lot. Country of origin on the gum reads Germany.
Send the grades you buy today with the annual volumes and pack sizes, and we will come back with availability, documentation, and samples. If you work from a competitive specification rather than a type number, send the specification and we will say which grade matches it and where it does not.
A conventional concentrate is built from a desensitizing gum, an acid and its buffer, a corrosion inhibitor, wetting agents and solvents, and a preservative. P.A.T. Products supplies three of those inputs: gum arabic for desensitizing, citric acid for pH, and sodium benzotriazole 40% solution for the copper and brass a circulating solution touches.
No. We supply raw materials to the companies that blend pressroom chemistry, not a finished concentrate to a printer. If you blend your own fountain solution, plate gum, or plate etch, that is the conversation we are set up for.
A fountain solution is acidic water that circulates continuously through metal hardware. Benzotriazole chemistry forms a protective film on copper and brass, which is what the wetted parts of a recirculation and dampening system are often made of. The sodium salt is supplied as a water-soluble liquid so it meters straight into a water-based concentrate.
Type 4880, with Type 4915 as the second grade. Both are purified spray-dried gum arabic powders in agglomerated form, specified as fast soluble in cold water, so there is no grinding step ahead of the make-up tank. Country of origin is Germany.