Epoxy.com Product #646 High Temperature Chemical Resistant Translucent Epoxy Resin System

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Epoxy.com Logo - Epoxy, Polyurethane, Polysulfide, Polyester, MMA - Methyl Methacrylate and other Construction Resin Systems - Over 350 Products- Since 1980

Epoxy.com Product #646

High Temperature Resistant Epoxy Mortar


Epoxy.com PRODUCT #646 Heat Resistant Epoxy is a two component translucent black highly cross-linked novolac epoxy resin system. Epoxy.com PRODUCT #646 is especially formulated to be used as a high temperature grouting or laminating resin. It is used to protect concrete, steel and other substrates from high temperatures and corrosion. Epoxy.com PRODUCT #646Heat Resistant Epoxy is similar to Epoxy.com Product #641, Heat Resistant Epoxy but does not have the pigments that Epoxy.com Product #641 has.


  • Stable up to 400°F
  • High chemical resistance to acids, alkalies and other chemicals
  • Low viscosity allows penetration into fiberglass fabric to make high temperature composites
  • Low viscosity allows filler loading for high temp epoxy grout


  • Steel and Concrete Protective Surface where high temperatures are encountered:
  • Chemical processing plants and equipment
  • Food and dairy processing plants
  • Utility plants
  • Industrial Plant Flooring under thermal units
  • PGD scrubber duct
  • Tanks and vessels
  • De-min concrete pads
  • Water boxes
  • Ball mill sumps
  • Heat Exchangers


Color Black
Pot Life 30 minutes @ 72° F
Mixing Ratio 2 Part "A" to 0.8Part "B" By Volume
Viscosity "Mixed 1500cps
Tack Free 12 hours @ 72°F
Full Cure 7 days @ 72°F
Force Cure Minimum 4 hours @ 150°F & then
Minimum 6 hours @ 250°F
Recommended Minimum Film Thickness 2 Coats @ 15 mils each
Flash Point > 200°F


Compressive Strength (ASTM D-695 - 7 days) 15,000 p.s.i.
Flexural Strength (ASTM D-790 - 7 days) 13,500 p.s.i.
Tensile Strength (ASTM D-638 - 7 days) 8,000 p.s.i.
Tensile elongation (ASTM D-638 - 7 days) >2.8%
Shore D Hardness 85
Adhesion ASTM D 4541 Concrete Failure
Operating Temperature Wet: 300oF
Dry: 400oF
PH Range 1 to 13.5


Immersion/Full Chemical and/or heat Exposure 5 days

Force cures must be used for enhancement of high temperature and chemical resistant properties or to allow the coating to be placed in service before 5 days. Allow the coating a post cure of 12 to 24 hours before force curing.

Minimum 4 hours @ 150°F
Minimum 6 hours @ 250°F

CURED: Chemical resistance

acids, alkalies, alcohols, ketones, aromatics and other solvents.


Concrete: Remove dirt, loose particles and oil contaminants by scarification, sandblasting, Shotblasting. Vacuum surface before application.

Steel: Remove all grease, dirt and other contaminants from surface prior to sandblasting. Grind sharp edges to a radius of 1/8". Remove all weld splatters. Sandblast to a white metal finish according to SSPC-SP-5-63 or NACE standard TM-01-70 with a minimum anchor profile of 3 mils.


Mix 2 parts "A" Component with 1 part "B" Component using a slow-speed drill and Epoxy.com - Mixing Paddle for 3-5 minutes. Apply immediately. High temperatures will shorten pot life.


Epoxy.com PRODUCT #646 Heat Resistant Epoxy can be applied by brush, roller or trowel. Epoxy.com PRODUCT #646 can be applied by trowel or grout pump. Epoxy.com PRODUCT #646 Heat Resistant Epoxy is designed as a one coat system (minimum 45 mils, maximum 300 mils). Substrate temperature should be a minimum of 60°F for application to commence. If a second coat is needed before the first coat cures, no surface preparation is needed. Simply apply the second coat maintaining the required standards. However, if the first coat has cured longer than 7 days the first coat must be brush blasted prior to the second coat.

COATING: One gallon covers approximately 26.7 ft.2 at 60 mils

Grout: Epoxy.com PRODUCT #646 can be easily made into a heat resistant epoxy grout by adding from 1 to 3 parts by volume of Product #76 Epoxy Extender to the mixed epoxy.

3 gallons Epoxy.com PRODUCT #646 + (3) 48 lb. bags #76 = 2,246 cu.in. per unit

CLEANING: Clean all equipment immediately after use with MEK or acetone.


"A" Component contains epoxy resin. DANGER! "B" Component contains alkaline amines; strong sensitizer. May cause skin sensitization or other allergic responses. Use with good ventilation, particularly if material is heated or sprayed. Prevent all contact with skin or eyes. Wear protective clothing, goggles, gloves and/or barrier creams. Keep container closed when not in use. Wash thoroughly after handling.

FIRST AID: In case of skin contact, immediately wash with soap and water. in case of eye contact, flush eyes with copious amounts of water for at least fifteen (15) minutes. Remove contaminated clothing shoes. If irritation persists, seek medical attention. Wash clothing before reuse.


Proper mixing and installation is critical to the optimal success of all product.  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.

For more information please contact:

A Division of Epoxy Systems, Inc
20774 W. Pennsylvania Ave.
Dunnellon, Florida 34431
Over 350 products,
Since 1980
Florida & Vermont

Office Hours: 9AM-4PM Eastern Time (6AM-1PM Pacific Time).
Closed 12Noon-1PM Eastern Time for Lunch

321-206-1833   Customer Service - Ordering and Order Status
                          Katey Fontaine, VP - Customer Service Director

714-657-3826  Technical Support
                         Norm Lambert, President - Technical Support Director 

352-489-1666   Accounting and Administration
                         Debby Lambert, CEO, and CFO

352-489-1625   Fax line to all Departments

24 hour Hazmat Emergency Telephone Response Service -1-800-633-8253

We accept Mastercard, Visa and American express

Copyright © 1994-2009 EPOXY.COM a division of Epoxy Systems, Inc. - Florida and Vermont.  All rights reserved.

Unless other wise agreed upon in writing, buyer is responsible for the cost of shipping.

This information is presented in good faith to assist in determining whether this product is suitable for application. No warranty or representation, however, is intended or made, nor is protection from any law or patent to be inferred, and all patent rights reserved.

Epoxy.com a division of Epoxy Systems, Inc.  warrants its products (when properly stored) for the period of time as follows: Epoxies, Product #315, Product #315BC, and Product #316 one (1) year; Polyesters, Methyl Methacrylates (normal) two (2) months and Polyurethanes Four (4) months;  Power Tools and Equipment 90 days; Vinyl Esters, High Molecular Weight  Methacrylates (HMMA) and all other resins (not specifically mentioned above) 30 days; hand tools (non-power tools) 30 days.   Epoxy.com warrants that its products will be free of manufacturing defects and will be in conformity with published specifications when handled, stored, mixed and applied in accordance with recommendations of Epoxy.com. If any product fails to meet this warranty, the liability of Epoxy.com will be limited to replacement of any non-conforming material if notice of such non-conformity is given to Epoxy.com within the warranty period for the material (as indicated above), or within 1 year of the delivery of materials (whichever is sooner). Epoxy.com may in its discretion refund the price received by Epoxy.com in lieu of replacing the material. No customer, distributor, or representative of Epoxy.com is authorized to change or modify the published specifications of this warranty in any way. No one is authorized to make oral warranties on behalf of Epoxy.com. In order to obtain replacement or refund the customer must provide written notice containing full details of the non-conformity. Epoxy.com reserves the right to inspect the non-conforming material prior to replacement. EXCEPT FOR THE EXPRESSED WARRANTY STATED ABOVE, THERE ARE NO OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WITHOUT LIMITATION, ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR PURPOSE. Epoxy.com 'S OBLIGATION SHALL NOT EXTEND BEYOND THE OBLIGATIONS EXPRESSLY UNDERTAKEN ABOVE AND Epoxy.com  SHALL HAVE NO LIABILITY OR RESPONSIBILITY TO THE PURCHASER OR ANY THIRD PARTY FOR ANY LOSS, COST, EXPENSE, DAMAGE OR LIABILITY, WHETHER DIRECT OR INDIRECT, OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. All quotes and sales subject to availability.

Many of our products are made on an individual order basis.   Unless authorized in writing by Epoxy.com a division of Epoxy Systems, Inc. in writing before the material is made, there are no returns on items purchased from us, once the order has been processed, and the material made. In the event of authorized returns a restocking charge will be charged in the amount of 30% of the value of the material returned or $150 whichever is greater.  No returns on non-list priced items.  All Returns are for merchandise (store) credit only, no cash or credit card credits.  In the event of a return, buyer is responsible for the cost of shipping and handling in both directions.

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