When should I use Product #632 instead of #630 or #633?

Use #632 for control joints that require chemical resistance and movement accommodation.

How do Product #630 and #633 differ?

#630 is a more flexible Novolac binder that also coats and stays clearer longer; it excels for slurry/mortar builds. #633 is a Novolac coating with slightly higher chemical and higher temperature resistance.

Is a conductive, chemical-resistant system available?

Yes. A conductive version of #630 is available for chemical-resistant ESD flooring.

Which Novolac Epoxy Is Best?

Q: Which Novolac epoxy is best?

There is no single best Novolac epoxy. The right choice depends on chemical exposure, temperature, and application (joint filler, mortar/slurry, or coating).

Short answer: it depends on your application and exposure conditions. Each Novolac epoxy has different strengths across chemical resistance, temperature tolerance, and flexibility. Use this guide to decide whether #632, #630, or #633 best fits your job.

Quick Selector

Need	Recommended Product	Typical Use
Chemical-resistant joint filler	#632 Novolac Control Joint Filler	Saw-cut joints in slabs exposed to washdowns or chemical splash.
Slurry/mortar binder or coating with flexibility	#630 Novolac Binder/Coating	Secondary containment, utilities, pulp and paper, harsh chemical areas.
Maximum coating chemical and temperature resistance	#633 Novolac Coating	Pump pads, trenches, solvent storage, high-exposure zones.

Product Summaries

#632 – Novolac Control Joint Filler

100% solids, flexible Novolac epoxy designed for saw-cut joints in concrete floors that see chemical attack, thermal cycling, or frequent washdowns. Ideal where joint fillers must resist acids, caustics, or solvents without shrinking or brittle failure.

#630 – Novolac Binder / Coating

A 100% solids Novolac epoxy used as a troweled mortar, slurry binder, or coating on concrete and steel in extremely corrosive environments. Engineered for resistance to strong caustics and up to 98% sulfuric acid under proper design. Common in chemical plants, pulp mills, secondary containment, water and waste treatment, and power utilities. A conductive version is available for ESD-safe, chemical-resistant flooring.

#633 – Novolac Coating

A 100% solids Novolac epoxy coating for harsh chemical and solvent service: secondary containment, solvent storage, pump pads, trenches, and other high-exposure areas. Frequently used as a seal coat over epoxy mortar systems when maximum chemical and temperature resistance are required.

Choosing Between #630 and #633

Both deliver superior performance in aggressive chemical service. Key differences:

Property / Consideration	#630 Binder/Coating	#633 Coating
Primary Role	Binder for slurry/mortar that can also coat	Purpose-built coating; can seal mortar systems
Flexibility	More flexible	Stiffer
Clarity (clear)	Stays clearer longer	Ambers faster
Chemical Resistance	Excellent	Slightly higher overall
Temperature Resistance	High	Higher
Best Fit	When you need slurry/mortar build or some flexibility	When you need maximum coating and temperature resistance

Typical Applications

#632 Joint Filler: Chemical plant floors, washdown areas, food and beverage plants, secondary containment slabs.
#630 Binder/Coating: Slurry resurfacers, secondary containment walls, trenches, utilities, pulp and paper mills, water and wastewater treatment.
#633 Coating: Top coats and seal coats for mortar systems, pump pads, solvent storage areas, high-temperature zones.

Epoxy.com Novolac Epoxy Comparison Chart #630 vs #633 (+ #632 Joint Filler)

Installation & Technical Notes

Proper mixing and installation is critical to the optimal success of all products. See Installation Tips, Techdata, & MSDS for more details on our products. Be sure to contact us with any questions and/or concerns that you have.

Talk to a Technical Specialist

For more information please contact:

Epoxy.com Technical Support
Phone: 352-533-2167
Email: norm@epoxy.com

Related product pages: #632 | #630 | #633

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