Matsui SI0325 Stop Black Silicone Ink – High-Opacity Dye-Blocking Silicone Ink for Performance Apparel

Matsui

The Matsui Yama Stop Black (SI0325) is a high-opacity dye-blocking silicone black — it stops dye migration on polyester and sublimated garments while printing as a deep, stand-alone black or an underbase blocker. Full silicone stretch, soft matte hand and superior wash durability on the fabrics most prone to bleed. Catalyze at 10% and print.

Blocks dye migration
Stops poly & sub bleed

Stand-alone or blocker
Black underbase too

High opacity
Deep matte black

Extreme stretch
Won’t crack

Catalyst required
90/10 to cure

Sublimated & poly
Bleed-prone fabrics

★ Add 10% silicone catalyst before printing — 4–6 hour pot life. For extreme bleed, print two layers or back with a barrier base.

Black that stops the bleed. Print on poly and sublimated garments without dye ghosting through. Questions? Call 512-454-0505.

Price range: $72.00 through $1,056.00

Description

Matsui Yama Stop Black — Dye-Blocking Silicone Black

Dye migration is the enemy of printing on polyester and sublimated garments — reds ghost pink, blacks turn brown, and a clean print goes muddy days later. The Matsui Yama Stop Black is built to stop it. It’s a high-opacity, dye-blocking silicone black that acts as both a stand-alone black and an underbase blocker: print it down and it seals off the dyes below so your black stays black and any colors on top stay true. It brings the full silicone package — extreme stretch and rebound, a soft matte hand, and superior wash durability — on exactly the fabrics that give printers the most trouble: dark synthetics, compression wear, sports uniforms and premium tech-wear.

Why You Need a Dye Blocker

Stops dye migration

Seals off the dyes in polyester and sublimated garments so prints don’t ghost, bleed or discolor.

Black & blocker in one

Use it as a deep stand-alone black or as an underbase blocker beneath your colors.

High opacity

Very high opacity optimized for dark and sublimated fabrics — solid, deep coverage.

Full silicone stretch

Flexes and rebounds with activewear fabrics — no cracking, with superior wash durability.

How to Print Stop Black

1 · Catalyze

Stir well, then mix 90% ink with 10% silicone catalyst. Only mix what you’ll use — 4–6 hr pot life. Rest 5–10 min to release air.

2 · Print

80–160 mesh (31–63T), 70–80 durometer or triple-duro, smooth strokes. Use a solvent-resistant, silicone-compatible emulsion.

3 · Cure & test

Flash ~220°F for 5–8 sec (or before colors on top); final cure 300–320°F for 1–2 min (film above 250°F). Confirm with a stretch and wash test.

Extreme-bleed fabrics. For the worst dye-migration garments, print two layers or back Stop Black with a silicone barrier base. Under-curing hurts dye-block performance — validate cure with a wash test.

Why Buy From River City Supply?

Real screen printers. Real support. Genuine Matsui ink.

Real printers on staff

Dye migration is tricky — we’ll help you block it with the right setup. Call (512) 454-0505.

Genuine Matsui silicone

Authentic Yama inks, bases and catalyst — the real performance system.

The whole silicone system

Blockers, whites, colors, bases, catalyst and effects — the whole Yama system in stock.

Financing available

Stocking up on ink and equipment? Apply for equipment financing.

Fast shipping + 1-hour pickup

Ships quick, and in-stock items are ready for pickup within an hour in Central Texas.

Support after the sale

Family-run and here Monday–Friday, 9–5, long after your order ships.

Call (512) 454-0505

You’ll also need

The required silicone catalyst, plus a solvent-resistant emulsion and silicone-safe cleaner. Fine-tune flow with Yama Reducer.

Whites & color on top

Pair with Super White for bright underbasing, then print Yama Colors over the blocker.

Fighting dye bleed?

Tell us your fabric and we’ll help you set up Stop Black to keep prints clean and true.

Call 512-454-0505

Apply for financing

Building out your silicone system? Spread the cost with simple equipment financing.

Explore Financing

Technical Specifications

Matsui Yama Stop Black (SI0325) — Technical Specifications

Type	Dye-blocking silicone black (blocker/underbase)
Part number	SI0325
Use	Stand-alone black or dye-migration blocker
Catalyst	Required — 90% ink / 10% Matsui silicone catalyst
Finish	Deep matte black; high opacity
Fabric types	Polyester, sublimated, nylon & spandex blends
Mesh	80–160 mesh (31–63T)
Squeegee	70–80 durometer or triple-duro; 1–2 smooth strokes
Flash cure	~220°F (104°C) for 5–8 seconds
Cure temp	300–320°F (150–160°C) for 1–2 minutes
Ink film temp	Above 250°F (121°C) internal
Pot life	4–6 hours after mixing
Storage	65–77°F, kept sealed
Shelf life	12 months unopened
Sizes	Quart, Gallon & 5-Gallon
Shipping	Drop ships from Matsui — Gardena, CA

Catalyst required. Mix 90% ink with 10% silicone catalyst and use within the 4–6 hour pot life. For extreme bleed, print two layers or back with a barrier base. Validate cure with a wash test.

Pairs Well With

Silicone Catalyst
Required — 10%Yama Super White
Bright underbase Yama Colors
Print over blocker Yama White 110
Everyday white Yama Reducer
Improve flow Financing
Spread the cost

Technical Sheets / Safety Data Sheets / Documents

Matsui Yama Stop Black Technical Data Sheet

Yama Silicone Technical Sheet

FREQUENTLY ASKED QUESTIONS

Matsui Yama Stop Black (SI0325) — Frequently Asked Questions

What is Yama Stop Black used for?

It’s a high-opacity, dye-blocking silicone black. It stops dye migration on polyester and sublimated garments and works as both a deep stand-alone black and an underbase blocker beneath other colors.

How does it block dye migration?

Printed down first, it seals off the dyes in the garment so they can’t bleed up into your print — keeping black black and colors on top true, wash after wash.

Can I use it as an underbase?

Yes — it’s engineered as both a stand-alone black and a blocker underbase. Print it, flash, then print your colors on top.

What fabrics is it for?

Polyester, sublimated garments, nylon and spandex blends — the dark, bleed-prone synthetics used in compression wear, sports uniforms and tech-wear.

What if the fabric bleeds badly?

For extreme dye migration, print two layers or back it with a silicone barrier base, and make sure it’s fully cured — validate with a stretch and wash test.

What mesh and cure should I use?

80–160 mesh, 70–80 durometer squeegee. Flash ~220°F, cure 300–320°F for 1–2 minutes (film above 250°F). Silicone reflects heat, so slow the belt if needed.

Why Buy From River City Supply?

Real screen printers. Real support. Genuine Matsui ink.

Real printers on staff

Dye migration is tricky — we’ll help you block it with the right setup. Call (512) 454-0505.

Genuine Matsui silicone

Authentic Yama inks, bases and catalyst.

The whole silicone system

Whites, colors, bases, catalyst, reducer and effects.

Financing available

Apply for equipment financing, or ask us how.

Everything under one roof

Ink, emulsion, screens, presses and curing.

Support after the sale

Family-run and here Monday–Friday, 9–5.

Call (512) 454-0505

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Matsui SI0325 Stop Black Silicone Ink – High-Opacity Dye-Blocking Silicone Ink for Performance Apparel

Description

Matsui Yama Stop Black — Dye-Blocking Silicone Black