Consider the following statements with respect to the maximum thickness of particle boards and identify the correct option.
Statement A: As per IS 3129:1985, the maximum thickness of low-density particle boards shall be 50 mm.
Statement B: As per IS 3129:1985, the maximum thickness of insulation particle boards shall be 40mm.
📖 Understanding Particle Board Standards (IS 3129:1985)
Particle board is an engineered wood product made from wood chips, sawmill shavings, or sawdust, and a synthetic resin or other suitable binder, which is pressed and extruded. IS 3129:1985 is the Indian Standard that specifies the requirements for different types of particle boards, including low-density and insulation boards. These standards define physical properties, including the standard manufactured dimensions like length, width, and thickness.
📝 Detailed Analysis of the Statements
Statement A: As per IS 3129:1985, the maximum thickness of low-density particle boards shall be 50 mm.
This statement is CORRECT. According to the standard, the specified thicknesses for low-density particle boards are 12, 15, 20, 25, 30, 35, 40, 45, and 50 mm. Therefore, the maximum standard thickness is indeed 50 mm.
Statement B: As per IS 3129:1985, the maximum thickness of insulation particle boards shall be 40mm.
This statement is INCORRECT. The standard specifies the available thicknesses for insulation particle boards as 12, 16, 19, 22, 25, 27, 30, 35, 40, 45, and 50 mm. The maximum thickness available as per the standard is 50 mm, not 40 mm.
Conclusion
Since Statement A is correct and Statement B is incorrect, the correct option is (b).
📊 Standard Thicknesses as per IS 3129:1985 (in mm)
| Board Type | Available Standard Thicknesses | Maximum Thickness |
|---|---|---|
| Low-Density Particle Board | 12, 15, 20, 25, 30, 35, 40, 45, 50 | 50 mm |
| Insulation Particle Board | 12, 16, 19, 22, 25, 27, 30, 35, 40, 45, 50 | 50 mm |
💡 Study Tips
- Know the Code: IS 3129:1985 is the key standard for particle boards in India.
- Max Thickness is 50 mm: A key takeaway from this standard is that for both low-density and insulation particle boards, the maximum specified thickness is 50 mm.
- Insulation Boards Have More Options: Notice that the list of available thicknesses for insulation boards is longer and includes more intermediate sizes (like 16, 19, 22, 27 mm) compared to low-density boards.