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PTR- Precured Tread Rubber

January 02, 2026

  

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PTR- Precured Tread Rubber

Pre-cured tread rubber(PTR) is a vulcanized rubber belt molded in a particular design pattern with a specified width, thickness & weight, suitable to perform on a given road application such as long-haul, short-haul, hilly terrains, and mines.
PTR rubber has two key aspects to it, first is the chemical composition of rubber compound and second is the design pattern. The chemical composition of a mine tread rubber is very different from that of hills, similarly the design pattern for short-haul might vary from the design pattern for a long-haul application. It is of paramount importance to understand the vehicle application before choosing the right tread, the right choice takes into consideration the type of vehicle, tyre axle, tyre type and road application.
INDAG manufactures the best quality retreading materials with meticulous attention to the details. We have the best manufacturing processes and management systems in place, well recognized and certified by world's most reputed organizations.
Reference to our certifications- SWISSCERT- ISO 9001:2015ISO 14001:2015.

BRANDS

PTR- Precured Tread Rubber PTR- Precured Tread Rubber Reviewed by SBR on January 02, 2026 Rating: 5

ENVELOPE Indag Full Skirt Envelopes

January 02, 2026

  

ENVELOPE

Indag Full Skirt Envelopes

An envelope is made of a thin gauge rubber sheet to cover the tyre casing before putting it in a chamber for curing in the retreading process. This is used for protecting the tyre casing from direct contact with hot air and provide uniform pressure all around on the tyre casing. We at Indag, along with our R&D Team have successfully developed envelopes that provide the lowest Cost-per-Cure in the industry.

TYRES Vs ENVELOPES SIZE

Tyre SizeEnvelope Size
10.00 - 2046.5 x 18
9.00 - 2044 x 18.5
7.50 - 1636.5 x 12
8.25 - 2040 X 15
8.25 - 1636.5 X 14
7.00 - 1536.5 x 12
6.00 - 16 / F78 - 1533.5 x 12
7.00 - 1533.5 x 12
5.90 - 15 / 5.20-1428.5 x 10
5.20 - 14 / 5.65 -1326.5 x 10
4.50 -12 / 5.65 - 1224.5 x 10
ENVELOPE Indag Full Skirt Envelopes ENVELOPE Indag Full Skirt Envelopes Reviewed by SBR on January 02, 2026 Rating: 5

USC-Universal Spray Cement

January 02, 2026

  

USC-Universal Spray Cement

Universal Spray Cement (USC) or rubber cement is a liquid rubber compound dissolved in a solvent. It is applied as an adhesive on the buffed tyre casing. Its job is to protect the buffed surface from oxidation to prevent it from causing retread failures.

ADVANTAGES:

  • Quick drying
  • Provides protection to tyre buffed surface from oxidation.
  • Provide excellent green tack
  • Good cured bonding between casing and cushion

AVAILABLE IN THREE VARIANTS

USC-Universal Spray Cement USC-Universal Spray Cement Reviewed by SBR on January 02, 2026 Rating: 5

URSG-Unvulcanised Rubber Strip Gum

January 02, 2026

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URSG-Unvulcanised
Rubber Strip Gum

The Unvulcanized Rubber Strip Gum (URSG) or cushion/bonding gum is a critical component used in the retreading process. It is used as an adhesive between the vulcanized tread (PTR) and the tyre casing which is vulcanized in the retreading process. The quality of URSG decides the strength of the bond between pre-cured tread rubber and tyre casing, low quality URSG renders weak bonds, which lead to separation between casing and PTR and results to a tyre failure. Based on different market needs we have a range of products in the URSG category- IN30, IN 40 & IN50, details are shared below-

IN 30

ADVANTAGES:

  • Strong bonding between casing and tread
  • Cost effective retreading
  • Protection against casing failure
  • Increases casing retreadibilty
TECHNICAL SPECIFICATIONS

To be used for chamber only

IN 40

ADVANTAGES:

  • Strong bonding between casing and tread
  • Shorter curing time
  • Designed especially for cooler running
TECHNICAL SPECIFICATIONS

Chamber:

  • Curing temperature: 125 - 127 ºC
  • Curing time: 150 minutes

Bonder:

Recommended for chamber

IN 50

ADVANTAGES:

  • Shortest curing time
  • High retreading productivity
  • Sustains good bonding strength at high temperatures in service
TECHNICAL SPECIFICATIONS

Chamber:

  • Curing temperature: 120 - 125 ºC
  • Curing time: 120 minutes

Bonder:

  • Curing pressure: 60 - 85 PSI
  • Curing time: 90 minutes

Recommended for both chamber & bonder

URSG-Unvulcanised Rubber Strip Gum URSG-Unvulcanised Rubber Strip Gum Reviewed by SBR on January 02, 2026 Rating: 5
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