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EpoHeat® Epoxy System
 
EpoHeat Epoxy System
 
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EpoHeat® Resin (1 quart) 20-8120-032
EpoHeat® Hardener (1 pint) 20-8122-008
 
The primary purpose of mounting metallographic specimens is for convenience in handling specimens of difficult shapes or sizes during the subsequent steps of metallographic preparation and examination. A secondary purpose is to protect and preserve extreme edges or surface defects during metallographic preparation.The method of mounting should in no way be injurious to the microstructure of the specimen. Pressure and heat are the most likely sources of injurious effects.
Castable mounting materials are recommended for mounting specimens that are sensitive to heat and/or pressure. Epoxy resins are commonly used because epoxy will physically adhere to specimens, have low shrinkage, and can be drawn into cracks and pores, especially if a vacuum impregnation chamber is employed and a low viscosity epoxy is used. Epoxies are very suitable for mounting fragile or friable specimens and corrosion or oxidation specimens.
 

EpoHeat, is a cycloalaphatic resin system with added benefits: 

Fast 90 minute cure time
55 °C (131°F) cure temperature
146 °C (295 °F) peak exotherm
High 85 Shore D Hardness
High 69° C (156°F) Heat deflection temperature
Low shrinkage
Low viscosity – 32cps @ 80 °C (176 °F), remaining so for about an hour allowing the product to wet the substrate and fill voids
Excellent Edge Retention and Clarity
Can mix large amounts in one batch and pour over an extended period of time, up to 4 hours (if left at room temperature) before it gels.
 
EpoHeat requires 90 minutes to cure in an oven @ 55°C (131°F.) This epoxy system is beneficial if preparing a sample that requires good edge retention and minimal shrinkage. EpoHeat can stand up to 4 hours before curing.   EpoHeat requires 90 minutes to cure in an oven @ 55°C (131°F.) This epoxy system is beneficial if preparing a sample that requires good edge retention and minimal shrinkage. EpoHeat can stand up to 4 hours before curing.  
 
 
Hardness measures the resistances of a material withstanding indentation. The Shore D hardness scale provides a measure of the resistance to indentation of polymer materials   Hardness measures the resistances of a material withstanding indentation. The Shore D hardness scale provides a measure of the resistance to indentation of polymer materials  
 
HDT (Heat Deflection Temperature) is a measure of distortion resistance under load and elevated temperature. HDT data shows EpoHeat will remain harder than our other epoxy systems during grinding/polishing.   HDT (Heat Deflection Temperature) is a measure of distortion resistance under load and elevated temperature. HDT data shows EpoHeat will remain harder than our other epoxy systems during grinding/polishing.  
 
Viscosity measures the internal resistance of friction when fluids move against themselves. Having a low viscosity allows the resin to flow into every nook to ensure that there are no gaps between the mounting media and the specimen. A high viscosity may allow air bubbles and gaps to be more persistent.   Viscosity measures the internal resistance of friction when fluids move against themselves. Having a low viscosity allows the resin to flow into every nook to ensure that there are no gaps between the mounting media and the specimen. A high viscosity may allow air bubbles and gaps to be more persistent.  
 
(Values based on largest gap present in sample)  

(Values based on largest gap present in sample)
EpoHeat presents a 4.5 micron shrinkage gap, in an 1¼” mounting cup. Low shrinkage allows the mounting media to protect the edge of the sample. If gaps are present, trapped abrasives may scratch your sample. If the edge of the sample is not backed up by your chosen mounting media, edge rounding may occur.

 
 
EpoThin® 50x EpoHeat® 50x EpoMet® 50x.
Epoxy Shrinkage. Left) EpoThin® 50x. Middle) EpoHeat® 50x. Right) EpoMet® 50x.
 
Applications:
EpoHeat is best used when preparing samples that require;
• Large mounts
• Excellent edge-retention
• Need for clarity
• Mount to glass for making thin sections
• Quick mounting
• Better abrasion-resistance match for difficult to abrade specimens
 
Ratios: 4 parts resin by weight to 1 part hardener by weight

Mounting cup size

Resin

Hardener

1”

12 grams

3 grams

1 ¼”

16 grams

4 grams

1 ½”

20 grams

5 grams

2”

32 grams

8 grams

 
Guide to choosing the appropriate support clip for your specimen:

Buehler SamplKlips®, Specimen Support Clips and UniClips® are intended for use in supporting specimens during mounting for metallographic preparation. The choice of clip will depend on the mounting method and specimen geometry. All of these products are compatible with all Buehler castable media types (epoxy and acrylic). Specimen support clips are not recommended for compression mounting. The SamplKlip® and SamplKlip® I are compatible with compression mounting, however the stainless steel SamplKlip® may deform during the mounting process. The UniClip® is perhaps best suited to compression-mounting, though for this application the UniClip® must be oriented with the “legs” upward to prevent collapse during mounting.

The weight of the clips should be considered where light specimens may have the tendency to float in castable media. If this is a concern, the stainless steel SamplKlip® is the best choice. For metallic specimens that are to be etched after preparation, one of the polymer clips (SamplKlip® I, Specimen Support Clip, or UniClip®) is best to prevent interference with etching due to a stainless steel clip in contact with the specimen.

Specimen thickness will influence choice of clip type as follows:

Clip Type Approximate Compatible Specimen Thickness
Spec Support Clip, UniClip 0.0035” to 0.090” (0.9 mm to 2.3 mm)
SamplKlip®, SamplKlip® I (large and small) up to 0.200” (5 mm)
 
Use the product dimensions listed below to ensure compatibility of these products with specimens.
Approximate Product Dimensions:
Product
Catalog Number
Height (in)
Width (in)
Length (in)
Weight (in)
SamplKlip®
20-4000-100
0.250
0.550
0.350
0.575
SamplKlip® I
20-4100-100
0.250
0.475
0.300
0.230
SamplKlip® I
20-4100-100s
0.250
0.425
0.250
0.110
Spec Support Clip
20-4001-000
0.250
0.290
0.375
0.145
UniClip®
20-5100-100
0.400
0.360
0.500
0.290
 
All dimensions and weights are approximate and intended only to provide a relative comparison of these products. The width values are measurements of the clip at its widest point without a specimen. UniClip® height given above includes legs (height ~ 0.235” without).
 
Accessories:
Release Agent – for coating the  mounting cup for easy release
Release Agent

 

Part Number

Qty

Release Agent

20-8185-002

2 oz

Release Agent

20-8185-008

½ pint

Release Agent

20-8185-016

1 pint

Release Agent

20-8185-032

1 quart

 

SamplKlip® - for supporting sample orientation in the mounting cup

SamplKlip

 

Part Number

Qty

SamplKlip®-Stainless Steel

20-4000-100

100




 

SamplKlip® 1 - for supporting sample orientation in the mounting cup

SamplKlip® 1

 

Part Number

Qty

SamplKlip® I-Plastic

20-4100-100

100

SamplKlip® I-Plastic (small O.D.)

20-4100-100S

100



 

Specimen Support Clips - for supporting sample orientation in the mounting cup

Specimen Support Clips

 

Part Number

Qty

Specimen Support Clips-Plastic

20-4001-000

100




 

SamplKups® - reusable mounting cups

SamplKups

 

Part Number

Size

Qty

SamplKups®

20-8180

1 ¼”

12

 

20-9177

25mm

12

 

20-9178

1”

12

 

20-9179

30mm

12

 

20-9181

1 ½”

12

 

20-9182

40mm

12

 

20-9183

50mm

12

 

20-9184

2”

12


 

Reusable EPDM Mounting Cups

Reusable EPDM Mounting Cups

Reusable EPDM Mounting Cups

 

Part Number

Size

Qty

EPDM Mounting Cups

20-8181

1”

5

 

20-8182

1 ¼”

5

 

20-8183

1 ½”

5

 

20-8184

2”

5

 

20-6185

2.5” x 1.4” x 1.8”

1

 

20-6186

6” x 4” x 2”

1

 

20-6187

6” x 3” x 1”

1





 

Flat Edge Filler (if necessary) – to increase the hardness of the castable mount media.

Flat Edge Filler

 

Part Number

Qty

Flat Edge Filler

20-8196

1 lb





 
FAQ
Can you use with disposable plastic castable mounting cups?
No, they will melt
Can you use with MetKleer® or Phenolic/Plastic Ring forms?
With care and the use of a vacuum grease to form a tight seal to the form and the base or glass slide. Remember this product has extremely low viscosity and may leak out.  The Metkleer Adhesive Base or MetGrip liners are not suitable for use in an oven.
Can you use with Conductive Filler?
Due to the low viscosity, the filler will sink to the bottom so the entire mount will NOT be conductive. It is best to sputter coat this sample if it needs to be conductive.
Why is my epoxy crystallized, gelled or rock hard in the container?
Due to the chemical purity of this product, it may crystallize. To relieve this condition, the entire container should be placed in an oven up to 50 °C (122 °F) for approximately two hours. If product is still crystallized after two hours, extend the time in the oven until the crystallization is relieved.
 
MSDS
EpoHeat Hardener 20-8122-016
EpoHeat Resin 20-8120-032
 
Tips, Tricks and Techniques
• Clean up any spills or drips with paper towel and ethanol
• Wear gloves
• Prepare sample under a hood, if possible
• Use Cast N Vac or Cast N Vac 1000
• 3 cup mix method (see video for demonstration)
• Can mix large mount in one batch, like a 6" x 4" x 2" Reusable EPDM Mounting Cup
• Better to use the EPDM molds, reduces leakage
• Use release agent to coat mold for easy removal of sample
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