Answer to: What Adhesive or Glue is used to adhere Glass to Frame?Reasons: 1. Glue Generally, iPhone 6 LCD assemblies and frames are held together by PUR glue, which has two types HMG (Hot Melt Glue) and CPG (Cold Press Glue). OEM factories use CPG to assemble the screen and frame, which requires 15 seconds cooling time, 2-3 hours protecting time (Protecting time: time to keep the mold to hold the glued parts). It needs higher cost, longer working time and better equipment to produce and handle. While the assembled flex or refurbished iPhone 6 screen replacements are glued with HMG which the cooling time is 10 seconds and the protecting time is only around 6 seconds. It costs less, doesn’t require a strict working environment, has a shorter working time and results in weaker stickiness.HMG quality also varies by Low, Middle and High grades due to the different prices. Most third-party manufacturers use mid-grade glue for Apple products, however, it is not sticky enough to meet the higher requirements as the iPhone 6’s frame is thinner and the screen is bigger than previous ...