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This post was last edited by jxkelley on 2017-3-30 09:01 and shared with all forum members: Plastic packing has been developed based on soft packing and semi-soft packing, combining the advantages of both. Its structure involves replacing the plastic round clips with large double-ring plastic loops, and pressing aldehyde-treated fibers or polyester threads onto the loops to ensure a uniform distribution of the fiber bundles ； The inner ring consists of snowflake-shaped plastic branches, which can both support the film and effectively break apart bubbles, thereby increasing the rate of oxygen transfer and its utilization efficiency. It ensures thorough exchange of the biofilm in the water, enabling efficient treatment of organic matter in the water. Products to be tested: Plastic filler materials include polyethylene (PE), polypropylene (PP), reinforced polypropylene (RPP), polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC), and polyvinylidene fluoride (PVDF) ethylene propylene copolymers, among others. It has good corrosion resistance, large pores, high flow rate, low resistance, low energy consumption, low operating costs, light weight, is easy to load and unload, and can be reused. It is particularly suitable for use in lifting, absorption, and washing towers at medium to low temperatures (60–150 degrees) in industries such as petroleum, chemicals, chlor-alkali, gas, and environmental protection. Testing items: Physicochemical properties: apparent density, particle size/diameter, whiteness, pH value, oil absorption, iodine absorption value, specific surface area, etc. Impurity content: volatile matter, water-soluble substances, residue on screening, ash content, loss on heating, heavy metals, particle content, moisture content, combustibles, etc. Hazardous substances: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers, etc. Aging properties: fatigue testing, tensile fatigue, flexural cracking, wear resistance, humid heat aging, hot air accelerated aging, heat resistance, ozone cracking resistance, UV aging, etc. Analysis items: composition analysis, principal component analysis, comparative analysis, analysis of unknown substances, spectroscopic analysis, failure analysis, complete composition analysis, material identification, formula restoration, etc. Testing standards: JBT 5209-1991 Plastic packing materials; HGT 21557.3-2006 Plastic stepped ring packing materials; HG/T 3986-2007 Technical requirements for plastic tower packing materials; JBT 1712-2008 Valve components – Packing and gaskets; NDGJ 88–89 Technical specifications for plastic water spray packing materials in cooling towers; DB62/T 2230-2012 Technical regulations for the construction of plastic greenhouses for sericulture; DB63/728-2008 Technical specifications for electronic tracking codes on plastic woven packaging bags for fertilizers; DB64/T 1056-2014 Technical regulations for the use of prefabricated directly-buried composite plastic insulation pipes; DB64/T 623-2010 Technical regulations for the early cultivation of table grapes in plastic greenhouses; DB64/T 761-2012 Technical regulations for the production of watermelons in plastic arch greenhouses in arid and sandy areas for green food (Grade A); DB64/T 856-2013 Technical regulations for the cultivation of peppers in plastic arch greenhouses; DB64/T 857-2013 Construction regulations for plastic arch greenhouses using PYSDP2008-3 type cement arch frames; DB64/T 932-2013 Technical regulations for the cultivation of onions and sweet potatoes together with watermelons in plastic arch greenhouses; DB65/T 2830-2007 Disposable plastic packaging boxes for fresh fruits; DB65/T 2831-2007 Plastic bottle (barrel) blanks; DB65/T 3051-2010 Basic technical parameters for PE resin used in plastic micro-irrigation products; DB65/T 3298-2011 Plastic bags for cotton packaging; DB65/T 3705-2015 Test methods for exposure to dry and hot atmospheres for plastic films and sheets; DBJT 08-107-2007 Energy-saving windows made of unplasticized polyvinyl chloride (PVC-U) (catalogue); DBJT 08-1978-1997 U-PVC plastic doors and windows; DBJT 08-51-1992 Installation catalogue for wiring using unplasticized rigid flame-retardant plastic pipes; DBJT 08-78-1997 U-PVC plastic doors and windows; DGJ 08-234-2001 Construction and acceptance regulations for glass fiber-reinforced plastic sand-filled drainage pipes (with explanatory notes); DG/TJ 08-308-2002 Technical regulations for buried plastic drainage pipes (with explanatory notes)