Monthly Archives: February 2019

  1. 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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    H

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  2. 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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  3. Cleanroom Design that Terra Recommends

    Terra Universal will certify its cleanrooms to guarantee “as built” compliance with cleanliness standards. What matters, though, is how the cleanroom performs in real world applications—in your application, with your personnel and processing equipment.

    Careful consideration of these operating conditions will help you select the configuration that meets your requirements and fits your budget!

    Cost vs. Coverage: Evaluating FFU Placement

    The cleanest modular cleanroom incorporates filter/fan units (FFUs) in every 2' x 4' (610 mm x 1219 mm) ceiling bay. This near-100% ceiling coverage provides a laminar flow of filtered air to quickly remove contaminants from the cleanroom, meeting ISO 3 or ISO 4 (Federal Standard 209(E) Class 1 or Class 10) environments (depending on the filter types selected, HEPA or ULPA).

    Of course, 100% ceiling coverage requires substan

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  4. Static Dissipative PVC vs Acrylic

    Static Dissipative PVC vs Acrylic

    Hidden Costs of Acrylic Enclosures

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    Compared to acrylic, static-dissipative PVC offers three benefits that reduce operating expenses and drive down overall ownership cost of a clean room, glove box, hood, desiccator, or other enclosure.

    Contamination Control

    Acrylic is a prolific static generator. The back-and-forth motion of wiping an acrylic surface creates positive and negative surface charges that attract and hold small particles.

    The resulting static cling makes it difficult to remove contaminants from the charged surfaces without the use of ionizing equipment or frequent cleaning with special anti-static solutions. Variations in the surface charges

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