Which material is used in car's wiper blade ??

 This question was asked on Koun Banega Karodpati program.

Question 

Which material is used in car's wiper blade to clear water ?

1.  Copper 

2.  Rubber 

3.  Wood 

4.  Titanium 

Answer 

Main material is rubber !!

Most vipors are made of  -----

Natural rubber    ---  cheap ones, soft.

                                        But wears out fast on Sun .

.

Silicon rubber  --  Good quality ones

                                    Lasts longer, doesn't make noise.

                                     Good for heat