The Complete Guide to Screen Printing Ink Types: Plastisol, Water-Based, Discharge, and Specialty Inks

Choosing the wrong ink for a job costs you more than a reprint. It can mean failed cures, poor wash durability, bad hand feel on a finished garment, or a customer who won’t reorder. Understanding screen printing ink types before you load the press is one of the fastest ways to improve output quality and reduce waste. This guide covers every major ink chemistry in production screen printing, explains where each one shines, and gives you a clear decision matrix to match ink to job.

Why Ink Choice Matters

Not all inks behave the same on press or off it. The ink you choose affects every downstream variable: how the substrate holds up, how long curing takes, what equipment you need, and whether the finished piece survives a wash cycle. Four factors drive most ink decisions:

• Substrate: Cotton behaves differently from 50/50 blends or 100% polyester. Some inks bond well with natural fibers; others demand synthetics or low-cure formulations to avoid dye migration.
• Opacity: Dark garments need high-opacity inks with a bright underbase or a chemistry that removes the dye rather than covering it.
• Hand feel: A stiff ink on a fashion tee gets returned. Soft-hand formulas matter on retail and promotional work.
• Curing: Under-cured ink washes out. Over-cured ink cracks or scorches the substrate. Temperature range, dwell time, and conveyor speed all vary by ink type.

Plastisol Inks: The Production Workhorse

Plastisol is PVC resin suspended in plasticizer. It does not dry or skin over in the screen, which is why it dominates high-volume production shops. Ink left in the screen between runs is not a problem.

Traditional plastisol typically cures around 320°F (160°C) in a forced-air conveyor dryer. Wash durability is excellent on cotton and cotton-rich blends. Opacity is high out of the can, which means solid coverage on white and light garments and strong results on dark substrates with a white underbase. 

That said, many modern low-cure plastisol formulations cure between 260°F and 300°F, making them a better fit for polyester-sensitive substrates where standard cure temperatures can activate dye migration.

For most production shops running cotton or blend T-shirts, plastisol remains the default. Browse our Spinks screen printing inks and Titan ink line for commercial plastisol options.

Water-Based Inks: Soft Hand, Real Trade-Offs

Water-based inks use water as the carrier instead of plasticizer. The result is a much softer hand feel and genuine fiber penetration on open-weave cotton. When a job calls for a vintage look or a barely-there print, water-based ink gets there where plastisol cannot.

Modern high-solids and high-opacity water-based systems have improved significantly. Paired with appropriate underbase techniques, they can produce vibrant, durable prints on dark garments, something that early water-based formulations struggled to do reliably.

The production trade-offs remain real on older systems. Water-based ink can dry in the screen during long runs in warm or low-humidity environments, requiring retarder additives or faster print speeds. Cure also takes longer, as the water carrier must fully evaporate before the pigment sets. Belt speed on a conveyor dryer typically needs to slow relative to plastisol runs.

Discharge Inks: The Dark-Garment Solution

Discharge ink works by chemically removing the reactive dye from the garment fiber, replacing it with pigment. The result is a print that sits in the fabric rather than on top of it, with a soft hand that is impossible to achieve with a traditional underbase-over-print plastisol setup.

The chemistry only works on reactive-dyed cotton. It will not discharge synthetic fibers or garments dyed with pigment, disperse, or vat dyes. Testing each garment blank before committing a run is essential.

Discharge activators require adequate ventilation and appropriate PPE during mixing and curing. Always follow the manufacturer’s SDS guidance and ensure your shop meets local ventilation requirements before running discharge. Cure temperatures and dwell times are more sensitive than plastisol, and the activator has a limited working life once mixed.

Used correctly on reactive-dyed cotton, discharge produces some of the highest-value garment results in the market, particularly on premium retail blanks.

Soy and Eco-Friendly Inks

Soy-based formulations replace a portion of petroleum-derived plasticizer with vegetable oils, primarily soy. The result is typically a lower VOC profile than standard plastisol and a softer hand feel, with cure temperatures comparable to conventional plastisol, so no dryer reconfiguration is usually required. 

Our Envirotech eco-friendly inks are built for shops looking to reduce their chemical footprint without a complete workflow overhaul.

It is worth noting that sustainability profiles vary by manufacturer and formulation. Many soy-based systems still contain synthetic resins and additives, so claims should be evaluated against the specific product’s SDS and ingredient disclosure. 

That said, reducing petroleum-derived content is a real and meaningful step for shops pursuing sustainability certification or responding to institutional client requirements.

Specialty Inks: Metallic, Puff, High-Density, Silicone, and More

• Metallic inks use metallic flake particles in a plastisol base. Mesh count matters: 86 to 110 mesh is typical, as finer meshes block the flake and coarser meshes create a heavy ink deposit.
• Puff inks contain a heat-activated blowing agent that expands during cure, creating a raised, tactile surface. Most effective on open graphics where the puff effect reads clearly.
• High-density inks are printed through thick stencils or multiple passes to build a three-dimensional effect. They cure at standard plastisol temperatures but require heavier emulsion deposits.
• Silicone and polyurethane inks are increasingly used for athletic and performance wear. Where stretch-plastisol can crack on highly elastic fabrics, silicone maintains flexibility through repeated mechanical stress and washing, making it the premium choice for cut-and-sew activewear.

Glow-in-the-dark inks use phosphorescent pigments in a clear or semi-clear plastisol base. A white underbase is required for full glow intensity.

Screen Printing Ink Types: Decision Matrix by Job Type

Match the ink to the job before you expose a screen.

Curing and Equipment Notes

The most common cause of ink failure in screen printing is improper cure. A plastisol print that washes out in three cycles was almost certainly under-cured, not defective ink. The full ink deposit must reach cure temperature, not just the surface. Traditional plastisols need around 320°F (160°C) throughout; low-cure formulations target 260°F to 300°F. Know which system you are running.

Flash dryers bring individual colors to gel, not full cure. They prevent smearing when overprinting, but the garment still needs to pass through a conveyor dryer for a complete cure. Running only a flash is one of the most common causes of wash-out failures.

Test cure with a stretch test: a properly cured plastisol print stretches with the fabric and returns without cracking. For production verification, a wash test on a pre-production sample before releasing the job is the only definitive check.

Browse our full range of screen printing supplies, including emulsions and press chemistry.

Ready to Stock the Right Ink for Every Job?

Printing Supplies Direct stocks plastisol, low-cure, water-based, discharge, soy-based, and specialty inks with same- or next-day shipping on most orders. Browse our full ink catalog to find the right fit for your press and your jobs.

Need help matching ink to a specific substrate or job type? Call our team at 860-516-6393 or email info@printingsuppliesdirect.com. We have working print professionals available to help narrow it down. Also see our complete Sprayway screen products for press room chemistry and maintenance supplies.

Screen Printing Types Frequently Asked Questions

Can you mix water-based and plastisol inks?

No. They are chemically incompatible. Mixing them causes both to break down, resulting in ink that neither cures properly nor adheres to the substrate. Always clean the screen thoroughly when switching chemistries.

What is the best ink for printing on 50/50 blends?

Low-cure plastisol is the standard choice. It cures below the temperature threshold that activates polyester dye, preventing the halo or bleed that standard plastisol can cause on poly-cotton substrates.

How do I test whether a print is fully cured?

The stretch test is the quick on-press check: stretch the printed area firmly between your thumbs. A fully cured plastisol print stretches and recovers without cracking. For definitive verification, wash the sample three times and inspect for ink loss, cracking, or color shift.

Which ink type gives the softest hand feel?

Discharge ink gives the softest result because it removes dye from the fiber rather than depositing a layer on top of it. Water-based inks are a close second on open-weave cotton. Silicone inks produce a uniquely smooth, slick hand on performance substrates. High-opacity plastisol without a soft-hand additive gives the stiffest result.