KNOWLEDGE
Knowledge Base
PC Sheet Chemical Compatibility: Adhesives, Seals and Cleaners That Destroy It
Unexplained cracking in polycarbonate (PC) guards and windows is usually environmental stress cracking (ESC), not a strength problem: incompatible adhesives, gaskets or cleaners migrate into high-stress zones of the sheet and initiate micro-cracks. Based on Section 3.6 of the Exolon® technical manual, this article maps PC's compatibility boundaries — resistant to mineral acids and most oils, but attacked by alkalis, amines, aromatic/halogenated solvents, aldehydes, ketones, esters and methanol — and adds practical guidance on threadlockers, PVC gaskets and neutral silicone seals.
How to Clean PC Sheet Without Scratching: Do's and Don'ts
Polycarbonate (PC) sheet has a pore-free surface that resists dirt, so cleaning should be easy — scratches almost always come from the wrong method: dry rubbing, razor blades, abrasives or rotating brushes, plus chemical damage from solvent-, amine- or alkali-based cleaners. Based on Chapter 8 of the Exolon® technical manual, this article provides do / don't quick-reference tables and field recipes for five scenarios on equipment guards: daily dust, grease, dye/sealant residue, rust marks and electrostatic dust attraction.
PC Sheet Cold Bending and Cold Folding: Minimum Radius, Parameters and Spring-Back
The minimum cold-bending radius of PC sheet is 150 times the sheet thickness (AR hard-coated sheet excepted); smaller radii require thermoforming. Cold folding is restricted to thin sheet: 1–2.5 mm to R2/90° max, 3–4 mm to R3/90°, 5–6 mm to R4/60°, with roughly 25° of over-folding to compensate spring-back and several days of stress balancing before the part reaches its final shape. Cold-folded and cold-bent parts must also be kept away from aggressive chemicals.
How Long Does PC Sheet Last Outdoors? UV Protection and Grade Selection
Whether PC sheet survives outdoors comes down to one thing: a UV protection layer. Unprotected polycarbonate yellows and embrittles, while coextruded UV-layer grades are validated by both artificial weathering and natural exposure under extreme climates, and carry a 10-year weather-resistance guarantee. This article walks through the common grades (GP/UV/AR/NR/FR/FG), their positioning and warranty terms, and gives an indoor/outdoor selection decision table — mechanisms and evidence only, no invented service-life numbers.
PC Sheet Is 250 Times More Impact-Resistant Than Glass: Grades and Selection
Polycarbonate (PC) sheet is almost unbreakable — up to 250 times more impact-resistant than glass. This article compiles the measured classifications: from 4 mm for EN 356 P5A, 10/12 mm for the top P8B security rating, AR hard-coated sheet in 3–12 mm certified to ECE R43 vehicle glazing, to machine-guard thicknesses under ISO 23125 and EN 12417. A grade-by-grade selection guide for purchasing and design engineers.
PC Sheet Installation: Rabbet Depth and Gasket Selection
PC sheet glazing details come down to two numbers and one table: a minimum rabbet depth of 20 mm on both sides (covering thermal movement and load-induced virtual shortening in one figure), and bolt holes oversized 6 mm beyond the screw diameter for sheet up to 2 m long. Gaskets must be chemically compatible with PC — EPDM, polychloroprene and silicone are suitable, PVC is usually not — and must be mechanically fixed, since adhesive securing is inadequate.
Why PC Sheet Bubbles in Laser Cutting: Pre-Drying Is the Key
Bubbles on the cut edge of laser-cut polycarbonate (PC) sheet are not a laser-power problem and not a sheet-quality problem: PC absorbs a small amount of moisture from the air, and the thermal cut vaporises that water, trapping bubbles in the melt edge. The remedy is to pre-dry the sheet before cutting and condition it afterwards — a circulating air oven at 120–125 °C, from 1.5 h for 1 mm to 30 h for 8 mm thickness, and process within 10 hours of cooling or re-dry. Sheets over 2 mm develop brownish cut edges regardless, an inherent feature of laser cutting.
PC Sheet CNC Machining Parameters: Drilling, Milling, Sawing and Routing
A quick-reference table of CNC machining parameters for polycarbonate (PC) sheet: drilling with a 110–130° point angle, 5–15° clearance angle, 0–5° rake angle, 19–40° helix angle, cutting speed 15–30 m/min and feed 0.1–0.3 mm/rev; milling at 100–500 m/min and 0.1–0.5 mm/rev; circular sawing at 17–50 m/s and band sawing at 10–17 m/s. Three counter-intuitive rules matter most: never use cutting oils or oil emulsions (they cause stress cracking), withdraw the drill regularly in deep holes to remove heat and chips, and keep hole walls smooth and burr-free or the fasteners will crack the sheet in assembly.
Remove the Masking Before Heating: PC Sheet Protective Film Rules
The polyethylene masking film supplied on PC sheet is transport protection, not process protection: it cannot take thermal loads and must be removed before drying, hot line bending and thermoforming. Heated with the film on, it bonds to the surface and leaves adhesive marks that scrap optical faces; where forming with film is genuinely required, special heat-resistant unprinted film must be ordered. This article covers when to strip the film, pre-drying parameters (120–125 °C, 1.5–30 hours by thickness) and how to protect the exposed surface afterwards.
Engineering Plastics Reference Table: Abbreviations, Chinese Names and Applications (PP/PE/PTFE/ABS/PA/PEEK)
Engineering plastic abbreviations confuse even experienced buyers: PTFE is polytetrafluoroethylene (aka Teflon), POM is polyoxymethylene (aka acetal or Delrin), PA is polyamide (nylon). This reference table from Cremage covers 20+ machined engineering plastics with abbreviation, full name, common trade names, key properties and typical applications — plus a quick selector: wear resistance → POM/PA/UPE; corrosion → PTFE/PVC/PP; transparency → PMMA/PC; high temperature → PPS/PEI/PEEK/PI.
PC & Acrylic Sheet Distortion Control: Thermal Expansion Calculation and Installation Clearance
When PC or acrylic sheets are mounted in steel frames, bowing and warping come from a simple root cause: plastics expand about 6 times more than steel. A 1800 mm door panel gains 3.34 mm more length than its frame over a 35 °C swing — locked down without clearance, the bow height reaches 47.5 mm. The standard practice is to reserve 3 mm of expansion clearance per meter: slotted or oversized bolt holes with large washers and bolts not fully tightened. For heavy-duty use, adopt a door-frame clamping design: fixed top and bottom, free left-right with per-meter clearance.
POM CNC Machining Guide: Grades, Parameters, Stress Management, and 0.05mm Flatness Control
The core of POM (polyoxymethylene / acetal) CNC machining is controlling heat and stress: select the right POM-H or POM-C grade, use sharp tooling and a generous chip load so the tool cuts rather than rubs, and combine light workholding, symmetrical material removal, and a two-stage roughing – stress relief – finishing process to produce consistent high-precision parts. Cremage integrates these steps into a standard process route, holding POM flatness within 0.05mm and controlling it precisely to drawing requirements — a capability that non-specialist machine shops rarely match.
Wuxi Cremage Technology Co., Ltd. — Direct Source Factory for Precision Acrylic and Engineering Plastics
Wuxi Cremage Technology Co., Ltd. traces its origins to Wuxi Haixing Crafts, founded in 1992, and has paid-in capital of RMB 5 million along with an import & export license. For more than 30 years the company has focused on precision acrylic and engineering plastics manufacturing, mainly producing acrylic products and machined plastic parts for high-precision industries such as automation, semiconductors, medical devices, new energy, and laboratories, with acrylic machining accuracy of ±0.01mm. Injection molding is a high-growth business, supported by Yizumi all-electric servo injection molding machines and an in-house mold shop, covering everything from mold flow analysis and distortion prediction to volume production. The company is ISO9001:2016 certified and exports to developed markets including Germany and the United States.
Anti-Static Acrylic Sheet: Principles, Parameters, and Applications
Anti-static acrylic sheet controls surface resistance to prevent static buildup from damaging electronic components, making it a common protective material for semiconductor and electronics automation equipment. This article explains the principles behind anti-static acrylic, the key surface resistivity parameters that define each protection class, typical applications in ESD-safe guards and viewing windows, and what to check when specifying a sheet.
Custom Equipment Guard Process and Tolerance Requirements
Acrylic equipment guards are critical safety and dust-protection components on automation lines: they must let operators see the process inside while keeping out dust, splashes, and accidental contact. This article outlines the complete custom process from requirement confirmation to delivery, along with the key tolerance and material selection points that help equipment builders move from drawing to production efficiently.
Injection Mold Development Process Explained: From Design to Production
Injection molding solutions hinge on mold development. This article explains the complete process for an injection mold — requirement confirmation, mold design, steel selection, machining, mold trials, and mass production — along with the key quality control points at each stage, typical lead times, and how maintenance affects mold life.
What Is POM? Properties and Precision Machining of POM Plastic
POM (polyoxymethylene / acetal) is a highly crystalline engineering plastic with excellent wear resistance, fatigue resistance, and dimensional stability, widely used for precision parts such as gears, sliders, and servo structural components in automation equipment. This article covers the material properties of POM, the key points for machining it, and practical guidance on material selection.
Material Selection Guide and Risk Prevention for Acrylic Sheet in Industrial Applications
High-quality virgin acrylic sheet offers light transmission of at least 92%, more than 20 years of indoor weather resistance, a clear, colorless cut edge, stable thermoforming without bubbling, and no odor when cut. Recycled sheet, by contrast, yellows within six months, transmits less than 86% of light, shows a yellow or bluish cut edge, bubbles when heated, and gives off a pungent odor when cut. Checking three things — cut-edge color, thermoforming behavior, and cutting odor — is enough to tell them apart quickly.