Prism Premium Polyester Knife Grade

Ultra-clear, no-shadow knife-grade polyester for precision seams and miters. Tenax Prism is a premium knife-grade polyester adhesive engineered for fabricators who demand the clearest, most shadow-free seam possible — particularly on quartz, granite, and marble where seam visibility is a quality benchmark. The ultra-clear formula produces no shadow effect at the joint, and the no-sag consistency holds cleanly on vertical surfaces and 45° miter applications without running.

5–7 minute gel time; tack-free in 22–25 minutes. Brilliant, smooth cure that polishes beautifully. Accepts color paste for precise stone matching. Interior use only; not suitable for temperatures below 32°F. 12-month shelf life.

Key Features

• Ultra-clear formula — one of the clearest polyester knife grades available
• No shadow effect — maintains even, flawless seam appearance
• No-sag consistency — holds vertical seams and 45° miters cleanly
• 5–7 minute gel time; tack-free in 22–25 minutes
• Brilliant, smooth cure — polishes to a high-gloss finish
• Accepts color paste for precise stone matching
• Exceptional strength with minimal adhesive use
• Interior use only

Prism vs. Tixo Xe vs. H-Knife — Which to Choose

• Prism (this product) — premium ultra-clear formula; no shadow effect; preferred for high-visibility seams on quartz and marble where seam quality is paramount
• Tixo Xe — proven 50+ year formula; transparent knife-grade; available in larger sizes; strong all-around performer
• H-Knife — transparent knife-grade; available in quart, gallon, and 5-gallon; for high-volume shops

Compatible Materials

• Engineered quartz (primary application)
• Granite, marble, quartzite, and all natural stone

How to Use

• Ensure surfaces are dry, clean, and free of dust and debris
• If tinting, add color paste to the resin before introducing the catalyst
• Mix resin and catalyst per the technical data sheet; stir thoroughly
• Apply immediately — gel time is 5–7 minutes; do not return mixed adhesive to the original container
• Allow to cure until tack-free (22–25 minutes), then grind flush and polish to match surrounding stone
• Seal container tightly after use; store between 65°F–77°F; 12-month shelf life

Works Well With

• Tixo Xe Transparent Knife Grade — alternative transparent knife-grade polyester
• Universal Color Paste — for color matching the adhesive to the stone
• Tenax Hardener 45ml — catalyst for small batch mixing
• Tenax Hardener 180ml — catalyst for regular shop use
• Tenax Mixing Cups 12oz — disposable cups for measuring and mixing
• Tenax #9 Razor Blade — for trimming cured adhesive flush before polishing
• Tenax T Tape Miter Tape — for masking miter joints during cure

Further Reading

Knife Grade vs. Flowing Polyester — Which Do You Need? → — when to use each type and how to choose the right Tenax formula for every job.

ProToolHaus – Your Certified Tenax USA Distributor

When you buy from ProToolHaus, you're ordering from a certified distributor of Tenax USA. We carry the full lineup and stand behind every product with expert guidance, fast fulfillment, and the kind of support that only comes from working in the stone industry every day.