Identification of Plastics By Numbers

Dear Readers,

 

During our daily life Plastics are everywhere. Some are Eco-friendly. At the bottom of most plastic containers you can find a small number inside the three arrow triangle recycling symbol and indicates the type of resin used to produce the plastic. The little number inside the triangle tells the real story and gives the information about the recycling which ranges from one to seven Sometimes below the numbers you also find the abbreviations for the plastic type (PETE, HDPE, etc.). The most widely accepted plastics for recycling are number is 1 and 2.

 

 

Code#1-PET (Polyethylene Terephthalate) PET is one of the most commonly used plastics in consumer products, and is found in most water and pop bottles, and some packaging. Products made of #1 (PET) plastic should be recycled but not reused.

Code#2-HDPE (High-Density Polyethylene) HDPE plastic is the stiff plastic used to make milk jugs, detergent and oil bottles, toys, and some plastic bags. Products made of #2 HDPE are reusable and recyclable.

Code#3 - PVC (Polyvinyl Chloride) PVC is a soft, flexible plastic, It is commonly used to make window frames, garden hoses, arbores, raised beds and to make plastic pipes and parts for plumbing. Products made using PVC plastic are not recyclable.

Code#4 - LDPE (Low-Density Polyethylene) The plastic grocery bags used in most stores today are made using LDPE plastic. Products made using LDPE plastic are reusable, but not always recyclable.

Code#5 - PP (Polypropylene) Polypropylene plastic is tough and lightweight, and has excellent heat-resistance qualities. PP is considered safe for reuse.

Code#6 - PS (Polystyrene) Polystyrene is  lightweight and easily-formed plastic with a wide variety of uses. It is most often used to make disposable Styrofoam drinking cups, Recycling is not widely available for polystyrene products.

Code#7 - Other (BPA, Polycarbonate and LEXAN) The #7 category was designed as a catch-all for polycarbonate (PC) and “other” plastics, so reuse and recycling protocols are not standardized within this category.

 

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Unit Weight of Metals

Dear Readers,

 

Now you may well aware about to calculate the weights of steel structures. During construction activities you want to calculate the weights of steel members you will do it absolutely. However if the material is other than steel?It is very simple, formula is same but the specific weight (kg/Cum) is varies.

 

Example below illustrate to calculate  plate size is 1500 X 1500 X 6 with different material (Iron & Copper)

 

For Steel ( 7850kg/Cum or 7.85kg/sqm)

                = (1.5 X 1.5 X 6 X 7.85)

                = 105.975 kg

 

For Copper Plate same size (8930kg/Cum or 8.93Kg/sqm)

                = (1.5 X 1.5 X 6 X 8.93)

                = 120.555 kg

 

For Unit Weight of more metals listed below table

 

 

Hope above table would be more useful for Construction Engineers. If any queries please send your queries through contact form or send a mail to engineerdiary@gmail.com

 

For More Details about Steel Weight Calculation click Here

For More Details about Specific Gravity click SG 

For More Details about Other Material Weight click Here

For More Details about Unit Weight of Building Materials click BM

For More Details about Dead Weight of Construction Materials click CM

 

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