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Chamber Depth

ISO Class

Inside Diameter

Terra Part # Price Ships in
Cylinder 12" ISO 6 8" 5235-69 75610 $1,451 13-17 Days 2
Cylinder 12" ISO 6 10" 5235-70 75611 $1,862 1-3 Days 3
Only 1 left in stock
Cylinder 12" ISO 6 12" 5235-71 75612 $2,127 1-3 Days 4
Only 2 left in stock
Cylinder 18" ISO 6 12" 5235-72 75613 $2,297 13-17 Days 5
Chamber Depth
ISO Class
Inside Diameter
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Custom-configured product. Contact Terra by phone, chat or email for a project-specific quote.
Custom-configured product. Contact Terra by phone, chat or email for a project-specific quote.
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Product Details
Product Details
  • Available ISO Ratings: ISO 6, ISO 7, ISO 8
  • Supports vacuum to 29.9" Hg
  • Fabricated of transparent 1/2" thick acrylic
  • O-ring inlaid in precision-routed channel, helps ensure uniform and ultra-low leak rate
  • Stainless steel draw latches and inlaid O-ring provide clean, leak-tight operation
  • Cylinder shape improves rigidity with less corners
  • Includes a vacuum gauge and two metering valves to permit flushing of the chamber with purge gas before application of vacuum
  • Optional vacuum/nitrogen pumps and vacuum safety relief valves available separately
  • Ideal for degassing small parts and mixed liquids, vacuum encapsulation, and general purpose vacuum experiments
  • Provide a safe, convenient way to transport moisture- and particle-sensitive materials
  • Clear acrylic construction provides full visibility of parts
  • CAUTION: Acrylic is damaged by alcohol and many other cleaning agents. Use only water and mild detergent
  • Solvent welding, 304 stainless steel and chrome-plated hardware are compatible with cleanroom environments
  • Contact to discuss custom sizes and applications, including installation of cable feed-throughs

Vacuum Chambers

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Features & Benefits

Features and Benefits

Learn More: Acrylic Vacuum Chambers

More Information

  • Ideal for degassing small parts and mixed liquids, vacuum encapsulation, and general purpose vacuum experiments
  • Provide a safe, convenient way to transport moisture- and particle-sensitive materials
  • Clear acrylic construction provides full visibility of parts
  • Sturdy construction and inlaid O-ring seal supports vacuum level down to 29.9" Hg (see ordering tables for vacuum capacity of each model)
  • Solvent welding, 304 stainless steel and chrome-plated hardware ensure a completely noncontaminating environment
  • Call to discuss custom sizes and applications, including installation of cable feed-throughs

These economical vacuum chambers provide a safe, reliable means for transporting contamination- and moisture-sensitive parts. They are also ideal for degassing operations, biological tests, material testing and other processes requiring sustained low and intermediate vacuums.

Cleanroom-Compatible Construction

Seven different sizes are available; all support vacuums to 29.9" Hg. All models are fabricated of transparent 1" (25 mm) thick acrylic, 0.52" (13 mm) acrylic on No. 5235-08. They feature chrome-plated latches to ensure a noncontaminating environment.

Terra installs a vacuum gauge and two metering valves to permit flushing of the chamber with purge gas before application of vacuum. Terra also features a full line of vacuum/nitrogen pumps. Recommended pump and accessories.

Note: Due to the inherent permeability of plastic, these chambers will not maintain a stable vacuum level over extended periods. For long-term vacuum maintenance, leave vacuum pump connected and running.

Why so Thick and Heavy?

Although your application may not require vacuum levels to 29.9"Hg, Terra builds its chambers to support this vacuum level due to safety concerns.

Variations in operators and operating protocol may lead to inadvertent spikes in vacuum pressure. Because these chambers are small, a few moments of vacuum operation beyond your target vacuum can subject them to substantially higher stress than you intend. Even a safety release switch is no guarantee that a chamber won't experience high vacuum pressure since these valves are not tamper-proof.

The best way to guarantee the safety of your parts and personnel is to use a chamber designed to sustain high vacuum levels. That's why Terra fabricates these chambers of 1"-thick acrylic.

Vacuum Leak Test, 0-72 hours

Chambers lose vacuum pressure initially due to air released from acrylic walls during first three hours. If vacuum level of 29.9"Hg is restored following this initial drop in vacuum pressure, chambers hold 29.9"Hg with no detectable change in pressure over duration of test.

Aluminum vs. Plastic

Terra offers chambers in both materials. Which is right for your application?

  • Acrylic Chambers
    • Economy: Lower material cost translates into a less expensive chamber.
    • Full visibility: You can add windows to an aluminum chamber, but nothing beats the 360-degree visibility offered by acrylic.
  • Aluminum Chambers
    • Chemical resistance: Aluminum stands up to Spor-Klenz®, alcohol and other sterilants, making it preferable in many bio/pharmaceutical applications. In addition, because many joining and sealing compounds are designed for use with metals, they may degrade acrylic and result in leaks or chamber failure.
    • Greater machining versatility: Aluminum allows easier addition of feed-throughs to accommodate power and data cords, electrodes and other accessories. These add-ons are more feasible on aluminum than acrylic chambers, which are more prone to cracks that develop into leaks over time. For such applications, an aluminum chamber is a wiser long-term processing solution.
    • More effective moisture barrier: Acrylic, because it is hygroscopic, allows moisture penetration on a molecular level. Under vacuum, these water molecules are released from the surface and may require several vacuum cycles to remove. These issues don’t occur with aluminum and other metallic moisture barriers.
    • Greater dimensional versatility: Due to greater strength, aluminum is more appropriate than acrylic for larger chamber sizes.

Vacuum Chamber Pre-Cycle

For optimal vacuum chamber performance, a pre-cycle must be performed to remove trace moisture clinging to the internal acrylic surfaces. Run the pre-cycle until vacuum pressures stabilize at 29.9" Hg, then begin standard operation.

Multi-pin Feedthrough

Optional 25-pin connector can be used to monitor conditions within the vacuum chamber.

Coaxial SMA Feedthrough

Double-ended, 50-ohm connectors allow small electronics to operate within the chamber.

Optional Vacuum Relief Valve

Adjustable pressure relief valve limits vacuum levels within the chamber, allowing pressure to be maintained at user-configured point. (NOTE: Vacuum pump must remain in operation to maintain desired vacuum level).

Tested to Hold Full Vacuum for 72 hours

Terra's acrylic vacuum chambers are tested to hold 29.9"Hg (99.9% vacuum) with no detectable change over a 72 hour duration. Heavy-duty one-inch-thick walls ensure chamber integrity and protect against cracking.

Precision Vacuum Gauge and Needle Valves

Vacuum chambers can be customized to include precision needle valves for exact application, monitoring, backfill, and bleeding of vacuum pressure in increments of ~1" Hg (~3% vacuum). The hardware is mounted over an extra layer of acrylic to prevent damage to the lid while the chamber is under maximum vacuum.

Inlaid O-Ring

Precision-routed channel ensures uniform seal along chamber perimeter to provide an ultra-low leak rate.

Optional Glass Top for Sensitive Optics

0.75"-thick tempered-glass top allows optical testing and monitoring that requires high clarity.

Acrylic Cylindrical Vacuum Chamber with Removable Shelving

Terra’s acrylic cylindrical vacuum chamber with hinged front door and removable shelves provides quick access for faster batch processing. The rigid cylindrical shape is ideal for storing long/narrow parts.

Continuous Product Improvement

At Terra, we strive to develop and produce the highest quality products for our customers to improve health, safety, performance, and yields. Our product quality is enabled by high-grade manufacturing equipment and processes, 45 years of engineering and application expertise, and our commitment to continuously improve.

Vacuum Chamber on Electric Height Adjusting Table

Electric height adjusting tables help easily position extremely heavy vacuum chambers to the right height to allow transfer of materials, or observe tests within the chamber.

Products Compliant With Your ISO Rating

Provide Terra with your desired ISO rating. We will tailor the product to meet your rating and supply a certificate of compliance appended to your invoice, to be included in your compliance package. All certificates are archived in Terra's system for quick retrieval.
Available Accessories
Popular Accessories
For a full list of accessories, select a product then click Choose Accessories on that product page.
  • Laboratory Nitrogen Generator

    Terra’s Nitrogen Generators provide a continuous, reliable supply of clean, dry nitrogen up to 99% pure to eliminate dependence on bulky canisters to operate desiccators and glove boxes.
  • Ionizing Gun: LED Power Indicator

    LED indicates when the Cleanroom Ionizing Blow-Off Gun is discharging ions and emitting clean air or nitrogen; low-voltage power source is intrinscially safe and meets static decay requirements
  • Small Nitrogen Generator for Single Glovebox or Desiccator Cabinet

    Compact membrane nitrogen generator allows set-up wherever there's a compressed air supply. This small configuration provides output suitable for a single laboratory glovebox or 3-4 chamber desiccator.
  • Compact Nitrogen Generator, Large Size for Multiple Large Desiccator Cabinets or Gloveboxes

    Compact nitrogen generator produces 99.5% pure N2 gas on demand, eliminating the need for costly nitrogen tanks. This large size N2 generator provides output suitable for six 10-chamber desiccators or six 4-port gloveboxes.
  • Multipin Feed-Through

    Subminiature D-Type Multipin Feedthrough. 2x25 Pins, 500 Volts, 5 Amps per Pin, 4.50" Conflat Flange.
  • 2 Pin Feed-Through

    SMA Coaxial Feedthrough, 50 Ohm matched impedance, 2 pins, grounded shield, double-ended, 2.75" conflat flange, without air-side connector
  • Electrode Feedthrough

    Optional cord/cable feed-throughs for power cords, sensor cables, data lines and thermocouple connectors.
  • Welch Rotary Vane Vacuum Pump

    This Rotary Vane vacuum pump offers high water vapor tolerance, light weight and high vacuum performance, making it ideal for many laboratory uses.
  • PC-Based Vacuum Control with Data Logging

    The eVAC Digital Vacuum Controller provides highly flexible control over vacuum levels by incorporating an electronically activated bleed valve, which adds the capability to reduce the applied vacuum.
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