IS 12866:1989 is the Indian Standard (BIS) for plastic translucent sheets made from thermosetting polyester resin (glass fibre reinforced). This standard specifies the requirements and testing methods for translucent plastic sheets made from glass-fibre reinforced thermosetting polyester resin. It covers material composition, dimensions, physical properties like light transmission, and mechanical properties like tensile and flexural strength for sheets used in roofing and cladding.
plastic translucent sheets made from thermosetting polyester resin (glass fibre reinforced)
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Glass Content (by mass) | Grade 1: >30%; Grade 2: 25-30%; Grade 3: <25% | Minimum 25% | ASTM D3841-16 |
| Barcol Hardness | Minimum 40 (for General Purpose Grade) | Minimum 35 | ASTM D3841-16 |
| Water Absorption (24h) | Maximum 0.5% | Maximum 1.0% | ASTM D3841-16 |
| Transverse Load Test (Breaking Load) | Min. 150 kg for a 150 mm wide specimen on a 500 mm span | Classified by resistance to uniformly distributed loads (e.g., 0.4 to 1.2 kN/m²). Direct comparison is not possible due to different test methods. | EN 1013:2012+A1:2014 |
| Fire Performance | Rate of burning ≤ 45 mm/minute | Classified by flame spread index (e.g., Index < 75 for Class C per ASTM E84) or Euroclass (e.g., B, C, D per EN 13501-1). | ASTM D3841 / EN 1013 |
| Weathering Test (UV Exposure) | 1000 hours; Light transmission change ≤ 20%; Yellowness index change ≤ 15 | 3000 hours; Change in light transmission (Δτ) ≤ 15%; No specific yellowness index, but must pass impact tests post-ageing. | EN 1013:2012+A1:2014 |