Recently, the Shanxi Provincial Quality Supervision Bureau organized seven types of food-related products including contact plastic packaging bags, ceramic products, glass products, contact plastic materials and products, contact paper and products, detergents and bottle caps. Product quality and safety risk monitoring.
This risk monitoring has monitored 281 batches of samples in the province. There are 6 batches of samples for detection. 2 of them are contact plastic materials and their product samples. The problem detection rate accounts for 2.7% of the variety. The problem detection item is benzene solvent residue; 4 batches are contact plastic packaging bag samples, the problem detection rate accounts for 10% of the variety, and the problem detection items are total migration amount and total solvent residue. The five production enterprises that detected the sample of the problem were all small and micro enterprises: Xinyuan Weaving Factory of Daishan County, Changfeng Kitchen Equipment Distribution Department of Yuzhong District, Jinzhong City, Fengxian Packaging Printing Co., Ltd., Jinzhong Tianli Plastic Products Factory, Taigu County Hengtong Packaging Color Printing Factory.
Double-Convex Lens, also named Bi-Convex Lens,composing of two convex surfaces, has a positive focal length. DCX Lens is most suitable where the object and image are on opposite sides of the lens and the ratio of the image and object (conjugate ratio) distances is between 0.2 to 5. It is used in beam expanders,projection optics systems, optical viewers applications etc.
We also supply kinds of plano-convex spherical lenses,plano-concave spherical lenses,bi-convex spherical lenses,bi-concave spherical lenses,meniscus spherical lenses,special spherical lenses,achromatic spherical lenses,ball lenses,sphere lenses etc..
Specification of our Spherical Lens as follow:
*Material: BK7,fused silica,MgF2,BaF2,CaF2,ZnSe,ZnS,Ge or other optical crystals
*Dimension Tolerance +0.0 -- -0.1mm
*Center Thickness +/-0.1mm
*Focal Length Tolerance+/-1%
*Surface Quality:60/40
*Surface Figure: lambda/2 at 633nm on plano side
*Clear Aperture >90%
*Chamfer 0.25mm at 45 degree typical
*Coating : AR coating options available :MgF2, VIS 0°, VIS-NIR, NIR I, and NIR II
Custom Wide Variety of Diameters and Focal Lengths.
Double-Convex Spherical Lens,Double-Convex Lenses,Double-Convex Ar Coated Spheric Lenses,Double-Convex Spheric Lens
China Star Optics Technology Co.,Ltd. , https://www.realpoooptics.com