wooden discs for tents
1985 Edition

IS 6641:1985 authorizes specific timber types for wooden disc manufacturing, listed in Appendix A (Clause 3.1). These include:

Notably, discs made from Haldu, Kanju, or Kaim must be immersed for 15 seconds in a 10% copper naphthenate solution in petroleum hydrocarbon (Clause 6.1) to enhance preservation. These species are chosen for their strength and resistance to environmental factors, ensuring the wooden discs are durable for tent applications.

As per IS 6641, wooden discs must adhere strictly to dimensions indicated in Figure 1 (all measurements in millimeters). The central hole needs to be precisely and cleanly drilled at the center (Clause 4.2), with edges smoothly rounded to prevent stress points. Manufacturing tolerances allowed are standard and defined under Clause 5.2. The discs should be crafted from timber species listed in Appendix A and have a smooth surface finish achieved through sanding and application of varnish or lacquer (Clause 7.1).

Summary of requirements:

These criteria ensure the discs are both functional and durable for their intended use.

According to Clauses 9.1 and 9.1.1 of IS 6641, each wooden disc shall bear clear and permanent markings that include:

• The manufacturer's name, initials, or registered trademark to ensure traceability.
• The year of manufacture for age verification.
• Optionally, the ISI certification mark may be applied, provided the manufacturer holds a valid license under the Indian Standards Institution (Certification Marks) Act. This mark signifies compliance with prescribed quality and inspection standards.

Markings must be legible and indelible to maintain clarity throughout the disc’s service life. Additionally, discs should have a smooth finish with appropriate varnish or lacquer coatings to protect both the surface and markings (Clause 7.1). This system supports effective identification and quality assurance.

IS 6641 specifies rigorous quality control and sampling procedures (Clause 8.2 and Table 1) to maintain product consistency:

• Sampling sizes depend on the lot quantity:

• Samples undergo testing for moisture content, dimensional accuracy, and workmanship including surface finish (Clause 8.3).
• Visual inspection is performed to detect any faults or defects.
• Lots are accepted only if the number of defective samples does not exceed the permissible limit (Clause 8.4).

These steps ensure the wooden discs meet durability, dimensional, and aesthetic quality requirements.

IS 6641 mandates that wooden discs receive a thorough surface treatment to enhance durability and appearance:

• Discs must be smoothly finished by sanding all surfaces, providing a uniform and defect-free texture (Clause 7.1).
• After sanding, the discs should be coated with varnish or nitrocellulose lacquer to protect against environmental damage.
• For discs manufactured from Haldu, Kanju, or Kaim timber species, a preservative treatment is required involving immersion for 15 seconds in a 10% copper naphthenate solution dissolved in petroleum hydrocarbon (Clause 6.1). This treatment guards against fungal decay and insect attack.

Together, these finishing and preservative processes ensure the wooden discs are robust, visually appealing, and suitable for outdoor use in tents.