Source: https://precisionfilmsystems.com/getting-into-flat-glass/flat-glass-fundamentals/ > Build a working understanding of glass, film, compatibility checks, manufacturer guidance, and the specification terms used on real jobs. [Home](https://precisionfilmsystems.com/) / [Learning Center](https://precisionfilmsystems.com/learning-center/) / [Getting Into Flat Glass](https://precisionfilmsystems.com/getting-into-flat-glass/) / Section 2: Flat Glass Fundamentals Getting Into Flat Glass ยท Section 2 of 9 # Flat Glass Fundamentals Build a working understanding of glass, film, compatibility checks, manufacturer guidance, and the specification terms used on real jobs. Use these references to separate product performance language from compatibility decisions. Current manufacturer guidance and the actual job conditions remain the authority for product approval. ## How to use this section Work through the recommended articles in order. Use the supporting articles when the job or decision in front of you needs more detail. ## Recommended path 1. [Glass and Film Compatibility Awareness](https://precisionfilmsystems.com/learning-center/glass-film-compatibility-awareness/) A cautious flat glass window film learning path for compatibility awareness, including glass type, Low-E, exposure, shading, absorption, reflectance, and manufacturer guidance. 2. [Glass and Film Compatibility: What to Check Before Recommending Film](https://precisionfilmsystems.com/learning-center/glass-film-compatibility-what-to-check-before-recommending-film/) Review glass construction, coatings, condition, exposure, shading, and current manufacturer guidance before recommending flat glass window film. 3. [Why Manufacturer Film-to-Glass Guidance Should Stay With the Job File](https://precisionfilmsystems.com/learning-center/manufacturer-film-to-glass-guidance-job-file/) Keep current manufacturer film-to-glass guidance, selected film details, glass notes, exposure conditions, review dates, and exceptions connected to the window film job file. 4. [Window Film Spec Sheet Glossary: Plain-English Terms for Flat Glass Jobs](https://precisionfilmsystems.com/learning-center/spec-glossary/window-film-spec-sheet-glossary-plain-english-terms-for-flat-glass-jobs/) Plain-English definitions for common window film spec sheet terms, including VLT, TSER, SHGC, reflectance, absorption, Low-E, privacy, film thickness, roll width, and linear feet. ## Supporting Learning Center articles Use these references when the job or decision needs more detail. - [What VLT Means on a Window Film Spec Sheet](https://precisionfilmsystems.com/learning-center/spec-glossary/what-vlt-means-on-a-window-film-spec-sheet/): VLT, or visible light transmission, tells you how much visible light passes through window film. Learn how VLT affects appearance, glare, privacy, heat expectations, and flat glass film conversations. - [What TSER Means and Why It Is Not the Whole Story](https://precisionfilmsystems.com/learning-center/spec-glossary/what-tser-means-and-why-it-is-not-the-whole-story/): TSER, or total solar energy rejected, is a common window film performance number. Learn what TSER includes, how UV, visible light, and infrared contribute to it, and why TSER should not be sold as simple heat rejection. - [SHGC Explained for Window Film Conversations](https://precisionfilmsystems.com/learning-center/spec-glossary/shgc-explained-for-window-film-conversations/): SHGC describes how much solar heat gets through a glass and film system. Learn how to explain it without treating one spec number as the whole recommendation. - [Total Solar Absorbance, Reflectance, and Transmittance on Film Specs](https://precisionfilmsystems.com/learning-center/spec-glossary/total-solar-absorbance-reflectance-and-transmittance-on-film-specs/): Total solar absorbance, reflectance, and transmittance describe where solar energy goes at the glass and film system. Learn how these window film specs affect performance, appearance, and compatibility conversations. - [Visible Reflectance, Interior Reflectance, and Exterior Reflectance](https://precisionfilmsystems.com/learning-center/spec-glossary/visible-reflectance-interior-reflectance-and-exterior-reflectance/): Visible reflectance, interior reflectance, and exterior reflectance affect how window film looks from each side of the glass. Learn how these specs affect appearance, glare, privacy, and customer expectations. - [Emissivity and Low-E: Plain-English Definitions](https://precisionfilmsystems.com/learning-center/spec-glossary/emissivity-and-low-e-plain-english-definitions/): Plain-English definitions of emissivity and Low-E glass for flat glass window film conversations, including why Low-E coatings affect compatibility checks. - [U-Factor and Window Film](https://precisionfilmsystems.com/learning-center/spec-glossary/u-factor-and-window-film/): U-Factor describes non-solar heat transfer through a window system. Learn how it differs from SHGC, TSER, and direct sun heat in window film conversations. - [IR Rejection vs Heat Rejection: Plain-English Difference](https://precisionfilmsystems.com/learning-center/spec-glossary/ir-rejection-vs-heat-rejection-plain-english-difference/): IR rejection and heat rejection are often treated as the same thing, but they are not. Learn what IR rejection means on a window film spec sheet and how it fits into flat glass film recommendations. - [Glare Reduction: How to Explain It Without Overpromising](https://precisionfilmsystems.com/learning-center/spec-glossary/glare-reduction-how-to-explain-it-without-overpromising/): Glare reduction is a common window film spec, but it depends on visible light, window direction, room layout, and customer expectations. Learn how to explain glare reduction on flat glass jobs. - [UV Rejection: What It Does and Does Not Tell You](https://precisionfilmsystems.com/learning-center/spec-glossary/uv-rejection-what-it-does-and-does-not-tell-you/): UV rejection is a common window film spec, but it does not explain total heat rejection or complete fade prevention. Learn what UV rejection means for flat glass film jobs. - [Daytime Privacy and Nighttime Privacy](https://precisionfilmsystems.com/learning-center/spec-glossary/daytime-privacy-and-nighttime-privacy/): Daytime privacy and nighttime privacy work differently because lighting changes. Learn how to explain reflective film privacy without overpromising. - [Neutral, Reflective, Dual-Reflective, Ceramic, and Metalized Film](https://precisionfilmsystems.com/learning-center/spec-glossary/neutral-reflective-dual-reflective-ceramic-and-metalized-film/): Neutral, reflective, dual-reflective, ceramic, and metalized films describe different film constructions and appearances. Learn how to explain the tradeoffs plainly. - [Decorative, Frosted, Translucent, and Opaque Film](https://precisionfilmsystems.com/learning-center/spec-glossary/decorative-frosted-translucent-and-opaque-film/): Decorative, frosted, translucent, and opaque films change glass in different ways. Learn how to match privacy, daylight, view, and branding expectations. - [Film Thickness and Mil Ratings](https://precisionfilmsystems.com/learning-center/spec-glossary/film-thickness-and-mil-ratings/): Mil ratings tell you window film thickness, but thickness is not the whole recommendation. Learn when mil matters for solar, safety, and security film work. - [Safety Film vs Solar Film](https://precisionfilmsystems.com/learning-center/spec-glossary/safety-film-vs-solar-film/): Safety film and solar film solve different problems. Learn how to separate heat, glare, privacy, glass retention, attachment systems, and customer expectations. - [Wet Glaze, Edge Gap, and Job-Site Terms the Spec Sheet Cannot See](https://precisionfilmsystems.com/learning-center/spec-glossary/wet-glaze-edge-gap-and-job-site-terms/): Wet glaze, edge gap, and job-site edge conditions can affect trimming, prep, appearance, and customer expectations before window film is installed. ## Section navigation - Previous: [Section 1: Considering Flat Glass](https://precisionfilmsystems.com/getting-into-flat-glass/considering-flat-glass/) - Next: [Section 3: Preparing the Business](https://precisionfilmsystems.com/getting-into-flat-glass/preparing-the-business/)