51. Fillers such as zinc oxide and carbon black are added to the crude natural rubber before vulcanisation in order to improve its
52. Valcunisation of rubber decreases its
53. Silicone is a/an
54. Alkyd resin can not be used for making
55. Which of the following polymers is used for making a non stick coating on frying pans?
56. Synthetic rubber
57. Which of the following is generally not used as eord for synthetic rubber tyre casing?
58. Teflon is
59. Terylene is
60. Polycondensation of saturated dicarboxylic acid with polyhydric alcohol produces
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