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IS 14695:1999 is the Indian Standard (BIS) for glass fibre base coal tar pitch outerwrap. This standard specifies the requirements for glass fibre-based coal tar pitch outerwrap, used for protecting buried or submerged steel pipelines from corrosion. It covers material composition, physical properties like strength and softening point, and methods for testing these properties. The outerwrap consists of a glass fibre mat impregnated and coated with coal tar pitch.
Glass Fibre Base Coal Tar Pitch Outerwrap
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Waterproofing and Damp-Proofing
AWWA C203-22American Water Works Association (USA)
HighCurrent
Coal-Tar Protective Coatings and Linings for Steel Water Pipelines—Enamel and Tape—Hot-Applied
Specifies the entire hot-applied coal-tar system, including the outer wrap, for steel pipeline protection.
BS EN 10290:2002British Standards / European Committee for Standardization (UK/EU)
MediumCurrent
Steel tubes and fittings for onshore and offshore pipelines - External liquid applied coatings
Covers performance requirements for various pipeline coatings, including coal tar systems, but is less prescriptive about material composition.
ASTM D4990-97a(2017)American Society for Testing and Materials (USA)
MediumCurrent
Standard Specification for Coal Tar Glass-Mat Roof Sheeting Used in Built-Up Roofing
Specifies a very similar material (coal tar impregnated glass mat) but for a different application (roofing).
BS 4164:1987British Standards (UK)
HighWithdrawn
Specification for coal-tar-based hot-applied coating materials for protecting iron and steel, including suitable primers where required
Historically a direct equivalent specifying the coal tar material, now superseded by a more performance-based standard.
Key Differences
≠IS 14695 is a specific material specification for only the outerwrap, while the closest equivalent, AWWA C203, is a system standard covering primer, enamel, inner wrap, and outer wrap in a single document.
≠The Indian Standard specifies a more stringent water absorption limit (0.5% max) compared to the AWWA C203 requirement for its glass-mat wrap (1.0% max).
≠IS 14695 specifies the base material by minimum mass per unit area (50 g/m²), whereas AWWA C203 specifies it by minimum thickness (0.51 mm).
Key Similarities
≈Both standards specify the outerwrap's primary function as providing mechanical protection and reinforcement for the primary anti-corrosion coating on buried steel pipelines.
≈Both IS 14695 and equivalent international standards (like AWWA C203) require the use of a glass fibre mat as the reinforcing base material.
≈The impregnating material in both the Indian and key international standards is specified as a hot-applied coal tar pitch or a compatible bituminous compound.
≈Both standards include mandatory tests for key physical properties such as tensile strength, pliability (flexibility), and water absorption to ensure fitness for purpose.
Parameter Comparison
Parameter
IS Value
International
Source
Mass of Finished Wrap (min)
500 g/m²
≥ 366 g/m² (7.5 lb/100 ft²)
AWWA C203-22
Tensile Strength, Longitudinal (min)
75 N/cm width
≥ 35 N/cm width (20 lbf/in)
AWWA C203-22
Tensile Strength, Transverse (min)
45 N/cm width
≥ 17.5 N/cm width (10 lbf/in)
AWWA C203-22
Water Absorption (24h, max)
0.5% by mass
1.0% by mass
AWWA C203-22
Pliability (Mandrel Diameter)
12.5 mm at 27°C
19 mm (0.75 in) at 25°C
AWWA C203-22
Base Glass Mat Mass (min)
50 g/m²
Not specified by mass; thickness specified as ≥ 0.51 mm
AWWA C203-22
Impregnant Content (Coal Tar)
275-325% of dry base material mass
Not specified as a percentage; wrap must be 'thoroughly saturated'
AWWA C203-22
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Minimum Breaking Strength (Longitudinal)60 N/cm
Minimum Tear Strength40 N
Minimum Softening Point105 °C
Maximum Penetration at 25°C20 (in 0.1 mm units)
Minimum Mass of coal tar pitch per unit area0.7 kg/m²
Water Absorption (max)0.5 % by mass
Tables & Referenced Sections
Key Tables
Table 1 - Physical Requirements of Glass Fibre Base Coal Tar Pitch Outerwrap