Please confirm your preference
Americas
Europe, Middle East, Africa
Asia Pacific

 

 

On February 1, 2022, Hexion Holdings Corporation announced that it has completed the sale of its Coatings and Composite businesses, which includes the epoxy specialty resins and base epoxy resins and intermediates product lines, to Westlake Chemical Corporation. For epoxy coatings and composite product inquiries, please contact customer service at https://www.hexion.com/en-US/company/contact/ or Service@hexion.com.

SF 5002 Patching Exterior Concrete 8131 3072

Description

EPON™ Resin 8131 / EPIKURE™ Curing Agent 3072

Introduction

This sand-filled formulation illustrates the use of flexibilizing epoxy resins to impart thermal compatibility with exterior concrete applications including patching of slab and joint spalls, skid-proofing loading docks and ramps, crack sealing and waterproofing, grout bonding of pre-cast concrete supports, and grouting of recessed electrical wiring, posts, tie-down fixtures, etc. Compliance with requirements of ASTM specification C-881, Type lll, Class C is indicated by test data developed from this formulation.

Formula

Material

Supplier

Pounds

Gallons

 

Part A

 

 

 

 

EPON Resin 8131

Hexion

100

11.00

 

Part B

 

 

 

 

EPIKURE Curing Agent 3072

Hexion

26

3.17

 

Aggregate Portion

 

 

 

 

Silica Sand1

 

755

34.20

 

 

Total

881

48.37

1Sand should be graded for good packing and troweling characteristics, dry and available in convenient standard weight bags.

The following sieve analysis is characteristic of sands which will trowel well:

Sieve No.  Percent Retained
6 0
8 0-10
16 10-20
30 25-35
50 35-45
100

5-15

Formula Variations

Resin Portion

Blend pigment pastes into the resin to impart color and hiding power. Air release agents such as DC-200 Fluid (Dow-Corning Corp.) and PC-1344 (Monsanto Co.) can be incorporated at levels of 50 to 70 parts per million of resin to facilitate release of bubbles entrapped during mixing and decrease the porosity of the topping. Thixotropes such as fumed silica can be incorporated at concentrations of 2 to 5 phr to impart non-sag characteristics for vertical applications.

 

Converter Portion

For convenience, nonylphenol can be blended with EPIKURE Curing Agent 3072 to increase the volume combining ratio to 2:1. Blending EPIKURE Curing Agent 3271 with EPIKURE Curing Agent 3072 provides higher reactivity for cool weather applications. Blends of EPIKURE Curing Agent 3055 with EPIKURE Curing Agent 3072 provide a longer working life for hot weather applications.

 

Aggregate Portion

Mix pea gravel with sand and combine with the binder at weight ratios of 7 or 8:1 for filling of holes over 1-inch deep. Substitute ceramic coated sand granules, such as Colorquartz (3M Co.), for sand when a decorative effect is desired. A blend of grade 11 and grade 28 particle sizes is suggested for best spreading and troweling properties. Abrasives such as crushed garnet, aluminum oxide, and Carborundum can be broadcast over ungelled coatings or toppings of this composition to provide a non-polishing, skid-proof surface.

 

Typical Handling Properties

Clean old concrete substrates by either sandblasting or scarification using care to remove surface contaminants such as oils, fats, greases, waxes or membrane coating paints. The laitance on new concrete can be removed by a muriatic acid etch, followed by thoroughly flushing with water, then scrubbing and drying.

 

To ensure maximum adhesion, apply a primer coating of the unfilled binder (mix the resin and converter portions) to the concrete by brush, roller or squeegee. A coverage rate of 160 square feet per gallon (average film thickness of 10 mils) is suggested for all but highly porous substrates, where heavier application may be required. Apply the sand-filled patching compound or topping before the primer coating has gelled.

 

Prepare the sand-filled system by first blending the resin and converter portions in the designated ratio and mixing until homogeneous. If manual stirring is used, frequently scrape the sides and bottom of the container to insure complete blending. Pour the binder over the sand and mix in a KOL Mixal paddle-type mortar mixer, or with a drill motor powered agitator.

 

Fill or spread the sand/binder mix to the approximate thickness desired and finish trowel. This provides additional working life by permitting the heat of reaction to dissipate from the thinner sections.

 

For skid-proof coatings and toppings, modify this procedure to include broadcasting of abrasive grains over the ungelled coating or topping. When the epoxy hardens, the excess, unwetted grains are swept off.

 

Typical Properties

Table 1 / Typical Properties

 

 

Units

Value

 

Combining ratio, by weight

 

 

 

Resin/Converter

 

100 : 26

 

Sand/Binder

 

6 : 1

 

Viscosity at 25 °C, binder

cP

1,200

 

Density, unfilled binder

lbs/gal

8.9

 

Density, sand-filled system

lbs/gal

18.3

 

 

 

 

 

 

 

 

Units

at13 °C

at 25 °C

at 38 °C

 

Pot life, 1

hrs

1.25

0.75

0.25

 

Expected working life, 2

hrs

2.25

1.5

0.75

 

Set time, 3

hrs

16.0

6.5

3.0

                                                   1 Pot Life based on 1-quart of binder.

                                                   2 Working Life based on the sand filled system.

                                                   3 Set time based on 1/4-inch thick topping.

 

Typical Cure Properties

Table 2/Typical cured state properties for unfilled binder and sand-filled binder systems

 

 

Units

Unfilled binder

Sand-filled binder

 

Tensile strength

psi

2,400

1,500

 

Tensile elongation

%

25

 

Compressive yield strength

psi

2,100

6,500

 

Izod impact, notch

ft•lb/inch

0.95

 

Hardness

Shore D

71

 

Water absorption, 24 hrs at 25 °C

%

0.54

 

Weight loss, 24 hrs at 60 °C

%

0.1

<0.1

 

Glass bow shrinkage, divergence

inches

0.0301

 

Coefficient of linear thermal expansion, 10-6 inch/inch

°C

169

59

 

Tensile bond strength

 

 

 

 

Dry concrete

psi

>320

>320

 

Damp concrete

psi

>320

>320

 

Aged concrete 2

psi

>320

 

Thermal compatibility, per ASTM C-884

 

Pass

                                                   1 The glass bow shrinkage meets the requirements of ASTM C-883.

                                                   2 1/4-inch thick topping was weathered for 5 years on a ground level slab (plant driveway in Louisville, KY).

Storage

Recommendations regarding storage conditions can be obtained by visiting our web site at www.hexion.com

General Information

These are starting formulations and are not proven in the user’s particular application but are simply meant to demonstrate the efficacy of the products and to assist in the development of the user’s own formulation.  It is the user’s responsibility to fully-test and qualify the formulation, along with the ingredients, methods, applications or equipment identified herein (“Information”), by the user’s knowledgeable formulator or scientist, and to determine the appropriate use conditions and legal restrictions, prior to use of any Information.

Safety, Storage & Handling

Please refer to the MSDS for the most current Safety and Handling information.

 

Exposure to these materials should be minimized and avoided, if feasible, through the observance of proper precautions, use of appropriate engineering controls and proper personal protective clothing and equipment, and adherence to proper handling procedures. None of these materials should be used, stored, or transported until the handling precautions and recommendations as stated in the Material Safety Data Sheet (MSDS) for these and all other products being used are understood by all persons who will work with them. Questions and requests for information on Hexion Inc. ("Hexion") products should be directed to your Hexion sales representative, or the nearest Hexion sales office. Information and MSDSs on non-Hexion products should be obtained from the respective manufacturer.

 

Contact Information

For product prices, availability, or order placement, please contact customer service:

www.hexion.com/Contacts/

 

For literature and technical assistance, visit our website at: www.hexion.com

 

 
Welcome to Hexion eSecurity
Your platform for receiving secure content.
If you've received a notification, you can validate its authenticity by going to our validation page.