The 30W48B is a 48mm (48-400) black electrolytic tinplate (tin coated steel) cap with a white pulp/polyethylene liner, typically used with glass bottles, jars and jugs. This continuous threaded (CT) cap has a black exterior with a gold interior and gold knurled edge. White pulp/polyethylene lined metal caps are a great general purpose closure. They are ideal for powders and non-acidic food products and consumer products such as jar candles and honey.
Electrolytic tinplate caps are highly sought-after metal closures that are sometimes referred to as tin coated steel caps, which are manufactured from 73 lb. - 80 lb. x .20 lb. electrolytic tinplate metal. The coatings on these caps are FDA approved and contain no heavy metals and the tooling meets ISBT standards. The metal itself has been sized, coated, varnished, and waxed. Tin plate steel is sometimes used in place of lightweight mirrors due to its shiny or lustrous like mirror appearance. Tin-plate steel is available in various color options such as, white, gold, red, and yellow and is more competitively priced than other options. Most tinplate steel metal caps are colored and have a uniform color and coating application on the closure surface area; whereas tin coated steel caps need a protective coating because they can corrode easily.
This information has been provided as a general guide. It is the customer's responsibility to select the proper container for product and application compatibility.