Retarders

A substance that slows the start or progress of a chemical reaction or an event. There are different types of retarders and each one acts on a different process.

Scorch Retarder

It is a chemical that retards the flammability of the fabric. It is usually applied to textiles such as clothing, furniture and bed linen.

Scorch retarders are of two main types

  • Reactive retardants: These chemicals react with the fibres of the fabric when exposed to heat, making it difficult to ignite.
  • Saturating retardants: These chemicals coat the fibres of the fabric and absorb heat, making it difficult for flames to spread.

Scorch retarders have many benefits

  • Reduces the risk of fire: People wearing fireproof clothing are less likely to be burned.
  • Prevents damage: Fire-resistant furniture is less damaged if it catches fire.
  • Prevents injuries and deaths: Fire-resistant products can help reduce the risk of injury and death in fires.

Chemical name: N-(Cyclohexylthio)phthalimide, CTP, PVI

CAS no: 17796-82-6

Description: When processing rubber prior to the vulcanisation process, high processing temperatures in combination with quick-acting accelerators can cause the processing temperature to approach too close to the vulcanisation temperature, which can initiate scorch. Early scorch may further render the rubber compound unusable.

PVI makes it possible to process the rubber safely, i.e. without premature cooking or scorching. It is used in sulphur vulcanised natural rubber (NR), isoprene rubber (IR), styrene butadiene rubber (SBR), NR-BR blends, NR-SBR blends and SBR-BR blends. When used at optimum dosage, it has no effect on the final properties of the vulcanised rubber such as tensile strength and ozone resistance.

Function: Flame retardant, vulcanisation inhibitor, flame retardant

Appearance: White or yellow crystalline powder

Areas of use: Rubber production, cosmetics, paint, agriculture, ceramics, cement

Packaging: 25kg bag

Storage: Store in original packaging in a dry, cool and well ventilated place. Avoid exposure to high temperatures or direct sunlight. Shelf life is 2 years from the date of production.

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