Natural Rubber Processing and Uses

What happens when the bark of the Hevea tree is tapped?

• A milky liquid exudes

• The tree dies

• The bark hardens

• The tree grows faster

What is added to the pot to check the coagulation of latex?

• Hydrogen peroxide

• Water

• Acetic acid

• Sulphur

What is the process of heating rubber with sulphur called?

• Vulcanization

• Coagulation

• Tapping

• Processing

What percentage of rubber produced is utilized to manufacture tires?

• 70%

• 50%

• 30%

• 90%

What is the main function of latex in the Hevea tree?

• Wound healing

• Nutrient storage

• Water retention

• Photosynthesis

What is the term for the rubber sheet formed after processing?

• Crepe rubber

• Sheet rubber

• Synthetic rubber

• Natural latex

What is the temperature range for vulcanization?

• 140–160°C

• 100–120°C

• 180–200°C

• 120–140°C

What is the primary source of natural rubber?

• Hevea tree

• Maple tree

• Pine tree

• Bamboo

What is the main advantage of synthetic rubber over natural rubber?

• Higher durability

• Lower cost

• Better elasticity

• More eco-friendly