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Torr Seal® Low Vapor Pressure Epoxy

Torr Seal® epoxy is resin seals vacuum leaks. Torr Seal can be used at pressures of 10-9torr. Torr Seal can bond to a variety of materials including glass, metal and ceramics.

Directions For Use:

  1. When mixing by hand, combine Part A (Resin) and Part B (Hardener) in the correct ratio and mix thoroughly until the color and consistency are uniform. Tube Kits have been designed so that squeezing equal length beads of part A and part B will give the proper ratio.
  2. Mixing the adhesive just prior to use is recommended. The temperature of the separate components prior to mixing is not critical, but they should be close to room temperature.
  3. Heat buildup during and after mixing is normal. To reduce the likelihood of exothermic reaction or excessive heat buildup, mix less than 900 grams at a time. Mixing smaller amounts will minimize heat buildup.


  1. Bonding surfaces should be clean, dry, and free of contamination.
  2. Once the adhesive is applied, the bonded parts should be held in contact until the part has developed handling strength (3 to 4 hours @ 25° C) note: this can vary with different bond configurations. It is not necessary to clamp the parts unless movement during cure is likely.


  1. Hardening time 1 to 2 hours @ 25° C. Can also be fully cured with heat such as; 2 hours at a maximum temperature of 60° C. Complete cure is obtained after 72 hours @ 25° C.
  2. After 24 hours, approximately 90% of full cure properties are attained at room temperature.
  3. This product can also be cured for 1 hour @ 80° C or 20 to 30 minutes @ 120° C.
  4. Heat cures can be modified to achieve a desired degree of cure from handling strength to full cure.

Clean up

  1. It is important to clean up excess adhesive from the work area and application equipment before it hardens.
  2. Denatured alcohol and many common industrial solvents are suitable for removing uncured adhesive.

Note On Hardening

Epoxy resins are prone to solidification or crystallization. If this occurs, the product can easily be returned to a liquid state by immersing the tube in warm water, approximately 100° F (38° C ) for 30 minutes. Ensure all material is melted prior to use; gently re-warm if necessary. Allow the resin component to return to room temperature prior to mixing with the hardener.
This warming process will not affect performance or product properties.

Specifications Table

Flash Point
175° C
Outgassing Characteristics
TemperatureCumulative Pumping TimeVapor Pressure (Torr)
25°C1 hr1.0 X 10-5
25°C40 hrs7.5 X 10-7
116°C (for 3 hrs)43 hrs7.0 X 10-5
135°C (for 9 hrs)52 hrs8.0 X 10-6
103°C (for 14 hrs)66 hrs2.0 X 10-6
Volume Resistivity
3.52 X 1014ohms/cm (at 25° C)
Corrosive to copper when uncured; non-corrosive when cured
Shelf Life
12 months minimum from date of shipment
Pot Life
55 mins (100g at 25° C)
Ave. Curing Times
24 hours at 25° C 2 hours at 60° C
Dielectric Strength
350 volts/mil

Product Datasheet
For a download of the product datasheet, click here.
Click here for the 9530001 SDS Click here for the 9530002 SDS Click here for the 9530004 SDS Contact KJLC for the SDS on this product.
Fluids FAQ
Click here for answers to some of the most common questions we are asked.
Contact Us
Contact Us
To contact someone directly, please click here, or call +1 412 387 9200 to get in contact with your dedicated sales team.

Ordering Table

All dimensions listed below, unless otherwise stated, are in grams.

Description Part Number Price In Stock Add
To Cart
Description Part Number Price In Stock Add
To Cart
TorrSeal® Base 82 grams Torr Seal® Hardener 36 grams 
$76.00 In Stock
Applicator gun w/ Torr Seal Cartridge (2 oz.) and 3 mixers 
P.O.R. In Stock
Applicator gun only 
P.O.R. Call for Availability
Torr Seal Cartridge (2 oz.) and 3 mixers 
P.O.R. In Stock
Torr Seal mixers, 6/pack 
P.O.R. Call for Availability

Note Hazardous material shipping rates will apply.
Contact Us - Torr Seal® Low Vapor Pressure Epoxy