Melt Pressure Transducers, Transmitters, Instruments and Gauges
Toronto Buffalo
  Toronto       Buffalo

Extruder Rupture Disks

MPI MELT PRESSURE manufactures Extruder Rupture Disks to act as reliable economical pressure relief safety devices in plastic extruders.
The Inconel Disk material ensures the Extruder Rupture Disks will instantly rupture at a specific pressure over a wide temperature range.

Features - Extruder Rupture Disks 

 Extruder Rupture Disk Brochure (pdf)

  • Inconel End DiskExtruder Rupture Disks
  • 750oF (400oC) Rating Optional - 1000oF (535oC)
  • 5% Accuracy
  • Stock Ranges : 1500, 2500, 3000, 3500, 4500, 5000, 5500, 6500, 7500, 8500, 9000, 9500, 10000, 10500, 11000, 12000, 13000, 14500psi
  • Maximum 20,000psi
  • Standard Thread (1/2-20UNF)
  • OPTION - threads, tip designs

MPI MELT PRESSURE engineers bring over 20 years of experience visiting and solving technical problems in the plastic extrusion industry in some of the most difficult environments for plastic melt pressure sensors and instrumentation. During that time we have experienced just about all the types of problems that can be encountered, and use this vast knowledge base to assist all our current customers.
SOME of the general application questions concerning Extruder Rupture Disks that our customers ask are provided on this page.

  1. Standard 1/2-20UNF Designs
  2. Standard 5/8"-11NC Designs
  3. Standard 3/4"-16NC Designs
  4. Standard 1"-20UNF Designs
  5. Standard M18x1.5 Designs
  6. Custom Designs
  7. Proper Installation
  8. Temperature Derating Curves

Our full range of products include : Melt Pressure Transducers, Melt Pressure Transmitters, Digital Melt Pressure Gauges, Mechanical Melt Pressure Gauges, Melt Pressure Indicators, Melt Pressure Controllers and Extruder Rupture Discs or Extruder Rupture Disks.
All our Extruder Rupture Disks come standard with Inconel Diaphragms and a stainless steel body.
Most Extruder Rupture Disks are shipped from stock in Buffalo and Toronto.



Standard 1/2"-20UNF Extruder Rupture Disks Designs

1/2"-20UNF Body Dimensional Data (pdf)
1/2"-20UNFx1.82"L Body Dimensional Data (pdf)

Extruder Rupture Disks - 1/2-20unf


Extruder Rupture Disks - Standard Stock (1/2-20UNF)

Pressure 1.82"Long
1500psi RP1202-1500 RP1203-1500 RP1206-1500 RP1208-1500 RP1210-1500 RP1212-1500
2500psi RP1202-2500 RP1203-2500 RP1206-2500 RP1208-2500 RP1210-2500 RP1212-2500
3500psi RP1202-3500 RP1203-3500 RP1206-3500 RP1208-3500 RP1210-3500 RP1212-3500
4500psi RP1202-4500 RP1203-4500 RP1206-4500 RP1208-4500 RP1210-4500 RP1212-4500
5000psi RP1202-5000 RP1203-5000 RP1206-5000 RP1208-5000 RP1210-5000 RP1212-5000
5500psi RP1202-5500 RP1203-5500 RP1206-5500 RP1208-5500 RP1210-5500 RP1212-5500
6500psi RP1202-6500 RP1203-6500 RP1206-6500 RP1208-6500 RP1210-6500 RP1212-6500
7500psi RP1202-7500 RP1203-7500 RP1206-7500 RP1208-7500 RP1210-7500 RP1212-7500
8500psi RP1202-8500 RP1203-8500 RP1206-8500 RP1208-8500 RP1210-8500 RP1212-8500
9000psi RP1202-9000 RP1203-9000 RP1206-9000 RP1208-9000 RP1210-9000 RP1212-9000
9500psi RP1202-9500 RP1203-9500 RP1206-9500 RP1208-9500 RP1210-9500 RP1212-9500
10000psi RP1202-10K RP1203-10K RP1206-10K RP1208-10K RP1210-10K RP1212-10K
10500psi RP1202-10.5K RP1203-10.5K RP1206-10.5K RP1208-10.5K RP1210-10.5K RP1212-10.5K
11000psi RP1202-11K RP1203-11K RP1206-11K RP1208-11K RP1210-11K RP1212-11K
12000psi RP1202-12K RP1203-12K RP1206-12K RP1208-12K RP1210-12K RP1212-12K
14500psi RP1202-14.5K RP1203-14.5K RP1206-14.5K RP1208-14.5K RP1210-14.5K RP1212-14.5K

Tip Dimension - Standard 1/2-20UNF

Extruder Rupture Disk Tip Dimentions



Standard 5/8"-11NC Extruder Rupture Disks Designs

5/8-11NC Body Dimensional Data (pdf)


Extruder Rupture Disk - 5/8-11NC

Extruder Rupture Disks - Standard Stock (5/8-11NC)

Pressure 4"Long 7"Long
5000psi RP5804-5000 RP5807-5000
7500psi RP5804-7500 RP5807-7500
10000psi RP5804-10000 RP5807-10000



Standard 3/4"-16NC Extruder Rupture Disks Designs

3/4"-16NC Body Dimensional Data (pdf)

Extruder Rupture Disk - 3/4-16NC


Extruder Rupture Disks - Standard Stock (3/4-16NC)

MODEL 5000psi 7500psi 9000psi 10,000psi
4" RP344-5000 RP344-7500 RP344-9000 RP344-10000
4"R RP344R-5000 RP344R-7500 RP344R-9000 RP344R-10000
5" RP345-5000 RP345-7500 RP345-9000 RP345-10000
5"R RP345R-5000 RP345R-7500 RP345R-9000 RP345R-10000
8" RP348-5000 RP348-7500 RP348-9000 RP348-10000
8"R RP348R-5000 RP348R-7500 RP348R-9000 RP348R-10000
9" RP349-5000 RP349-7500 RP349-9000 RP349-10000
9"R RP349R-5000 RP349R-7500 RP349R-9000 RP349R-10000




Standard 1"-20UNF Extruder Rupture Disks Designs

1"-20UNF Body Dimensional Data (pdf)

Extruder Rupture Disk - 1

Extruder Rupture Disks Standard Stock (1"-20UNF)

Pressure 8"Long
3500psi RP1008-3500




Standard Metric Designs - M18x1.5 - M14x1.5 Extruder Rupture Disks

M14x1.5 Body Dimensional Data (pdf)
M18x1.5 Body Dimensional Data (pdf)

Extruder Rupture Disks - Standard Metric Designs

Extruder Rupture Disks - Standard Stock (metric)

Pressure M14 - 1.82"L M18 - 6.7"L
6500psi   RPM186-6500
7000psi RPM142-7000  
9000psi RPM142-9000  
12000psi RPM142-12K  
14000psi RPM142-14K  




CUSTOM Extruder Rupture Disks Designs

MPI MELT PRESSURE engineers can design and manufacture almost any Extruder Rupture Disks design in quantities from 1 to 1000pcs. For any non-standard body design, please fill out and send back the PDF specification sheet.

Extruder Rupture Disk - CUSTOM  Designs

Custom Design Specification Sheet (pdf)



Proper Installation

Extruder Rupture Disks installation is very critical. They must be installed flush on the inner barrel of the extruder.
If there is an excessive dead space, plastic material may harden and form a plug. This may render the Extruder Rupture Disks ineffective, and cause a safety hazard.

Extruder Rupture Disk - Install



Temperature Effects on Extruder Rupture Disks

Extruder Rupture Disks are effected by temperature. Below is a table of how to change ratings of Extruder Rupture Disks based on temperature. All MPI burst discs have Inconel diaphragms, so are not greatly temperature dependant.

Extruder Rupture Disk - Temperature Correction