General Topic

  1. Chemical Compatibility Chart — Plastics

    This chart is intended as a general guide for various materials and chemicals. It shows some of the materials used in Terra’s products and chemicals likely to be used with them. Testing is strongly recommended for extreme conditions of use, such as prolonged exposure or immersion, high temperatures and high concentrations. The acids, caustics and salts in this chart are assumed to be in solution. Materials may react differently to the pure substances (glacial acetic acid, for example). See Terra Universal's line of plastic Desiccators.

    Hazards Key
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    Hazards (Only the primary ones are shown. For example, chlorine

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  2. Chemical Compatibility Chart — Rubber and Synthetics

    This chart is intended as a general guide for various materials and chemicals. It shows some of the materials used in Terra’s products and chemicals likely to be used with them. Testing is strongly recommended for extreme conditions of use, such as prolonged exposure or immersion, high temperatures and high concentrations. The acids, caustics and salts in this chart are assumed to be in solution. Materials may react differently to the pure substances (glacial acetic acid, for example). See Terra Universal's line of Rubber & Synthetic Gloves.

    Hazards Key
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  3. Chemical Compatibility Chart — Metals

    This chart is intended as a general guide for various materials and chemicals. It shows some of the materials used in Terra’s products and chemicals likely to be used with them. Testing is strongly recommended for extreme conditions of use, such as prolonged exposure or immersion, high temperatures and high concentrations. The acids, caustics and salts in this chart are assumed to be in solution. Materials may react differently to the pure substances (glacial acetic acid, for example). See Terra Universal's line of metal Pass-Throughs.

    Hazards Key
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    Hazards (Only the primary ones are shown. For ex

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  4. Cleaning & Sterilization Tips for the Cleanroom

    Cleaning & Sterilization Tips for the Cleanroom

    Whether lab technicians like it or not, cleanrooms are exposed to contaminants. Adulteration can occur from personnel, equipment, or even incorrect decontamination processes. Since many cleaning methods exist, it’s important to select one that’s best for your application; an careless technique may redeposit contaminants onto surfaces rather than take them away. Understanding particle-to-surface bonding (electrical, physical, or chemical) is one of the first steps to optimal cleaning efficiency. Keep reading for more tips that ensure your cleanroom remains clean.

     

    Basic Types of Cleaning

    “Wet cleaning” removes contamination with the use of a cleaning fluid. In some cases, wiping will move particles, but fail to remove them. Therefore, wet cleaning is typically implemented when wiping is not enough to overcome the particle adhesion. Cleaning solutions include a number of chemical cho

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  5. Under Pressure in Critical Environments

    Under Pressure in Critical Environments

    Controlled environments act as secluded clean spaces for performing select applications in a manner that protects the internal samples or materials and/or the workers involved. Air pressure is a key component of a cleanroom. The internal pressure and, by design, the differential pressure, are closely regulated and maintained.  Basic chemistry tells us that high pressure air has greater mass than low pressure air, and given the opportunity, will flow into the less dense environment.

    Ascending or descending pressure differentials are part of the foundation of most controlled environments. Maintaining a specific differential between adjacent areas reduces the inflow of airborne particulates and/or prevents hazardous materials from escaping. The type of application dictates whether a positive or negative pressure space is required. So, how do these two pressure types differ?

     

    Iso

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  6. When Grounding Isn’t Enough for Static Control…

    When Grounding Isn’t Enough for Static Control…

    High-tech industries have long been plagued by an unseen foe. From semiconductors to medical devices, manufacturers are forced to accept high product rejection rates due to particle contamination or critical defects. Oftentimes, contamination issues and product damage in these industries can be traced back to uncontrolled static electricity. When static is allowed to build-up, it becomes a double threat to a cleanroom, increasing the chances of ESA-induced contamination and electrostatic discharge (ESD) damage.

     

    ESA Contamination in Cleanrooms

    Electrostatic attraction (ESA) is the phenomenon that causes dust to stick to the glass screen of an old vacuum tube television. When particles become statically charged by friction or contact with another material, they adhere to surfaces that have the opposite charge. While this may seem harmless in the example of the TV monitor, the semiconductor industry works on

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  7. Making Sense of Biological Safety Levels

    Making Sense of Biological Safety Levels

    Biological safety Levels (BSLs) are prescribed by the CDC (Centers for Disease Control and Prevention) to inhibit contamination of a work environment and ensure worker safety by outlining operating procedures and atmospheric controls. If you’ve read the BSL guidance document, you may have found the infection-rate distinctions and cabinet classes hard to conceptualize. Here, we summarize section IV of the Biosafety in Microbiological and Biomedical Laboratories, 5th Edition.

     

    There are four levels of infectious-agent exposure, each designated to abide by a specific set of control designs and protocol. To determine the safety control level, laboratories must consider several factors, including disease transmission and severity, infection potential, microbe or agent origin, and type of work.  See “Biosafety Levels” below for a description of each level.

    How do BSLs differ fro

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  8. BioSafe®: The Cleanest Clean for Your Operation

    BioSafe®: The Cleanest Clean for Your Operation

    Terra Universal specifically designs environments and furnishings to meet the needs of aseptic operations that must conform to strict FDA, cGMP and other standards involving potential microbial contamination. Bio-pharmaceutical applications require this level of sterile environment for successful disease research and drug development. We call this special line of products BioSafe. What makes Terra’s BioSafe solutions clean enough for sterile operations? The answer hinges on high-grade materials and easy-clean designs.

     

    BioSafe Materials

    Smooth stainless steel (SS) construction (304 or 316 grade) is standard for many BioSafe cleanrooms and other enclosures. These products also incorporate all-stainless steel hardware. Chrome-plated fixtures, unlike stainless steel, are subject to flaking and deterioration from metal-on-metal action, and can eventually rust if exposed

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  9. 7 Strategies to Better Cleanroom Gowning

    7 Strategies to Better Cleanroom Gowning

    It may not come as a surprise that most clean room contaminants begin with employees. Dead skin cells and hair fragments constantly shed from our bodies. And according to one cleanroom expert, viable bacteria emissions from normal activity by an un-gowned individual could release several hundred colony-forming units per minute; therefore, personnel, above all else, should be properly covered before entering the controlled environment. Otherwise, all efforts and costs to maintain your clean room are negated.

    With a well-designed gowning area, proper cleanroom garments, and a strict gowning procedure, particle dispersion is minimized and the cleanliness specifications of your contained space remain uncompromised.

    Below are seven tips for maintaining an optimal gowning routine. Note, the first two practices prevent most contamination during the gowning process:

    1. Gravity affects particles, too.

    Depending on the la

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