The standard outlines specifications for wooden containers intended to hold and safeguard up to 100 microscope slides, detailing requirements for materials, dimensions, construction methods, and finishing. It serves as a guideline for producers, laboratories, and academic entities to manufacture and utilize durable, well-organized wooden slide boxes that meet uniform quality standards.
Overview
The standard outlines specifications for wooden containers intended to hold and safeguard up to 100 microscope slides, detailing requirements for materials, dimensions, construction methods, and finishing. It serves as a guideline for producers, laboratories, and academic entities to manufacture and utilize durable, well-organized wooden slide boxes that meet uniform quality standards.
Audience
Contents
Structure
Scope:
This standard specifies the requirements for wooden boxes intended for storing microscope slides, including size, tolerances, and construction details.
Sampling & Acceptance Criteria (Clause 2.1 & Table 1):
| Lot Quantity | Number of Samples | Maximum Allowed Defects |
|---|---|---|
| 51–100 | 5 | 0 |
| 101–150 | 8 | 0 |
| 151–300 | 13 | 1 |
| 301–500 | 20 | 2 |
| 501–1,000 | 32 | 3 |
| Over 1,000 | 50 | 5 |
Testing Requirements (Clause 1.3.2):
Referenced Standards:
This framework ensures consistent quality control through random sampling and clear acceptance parameters.
| Lot Range | Sample Quantity | Allowed Defective Units |
|---|---|---|
| 51–100 | 5 | 0 |
| 101–150 | 8 | 0 |
| 151–300 | 13 | 1 |
| 301–500 | 20 | 2 |
| 501–1,000 | 32 | 3 |
| Above 1,000 | 50 | 5 |
Frame Timber Examples:
| Common Name | Scientific Name | Code |
|---|---|---|
| Aini | Artocarpus hirsutus Lamk. | AIN |
| Deodar | Cedrus deodara D. Don | DEO |
| Sissoo | Dalbergia sissoo Roxb. | SIS |
| Teak | Tectona grandis Linn. f. | TEA |
Slide Rack Timber Examples:
| Common Name | Scientific Name | Code |
|---|---|---|
| Birch | Betula spp. | BIR |
| Ebony | Diospyros spp. (except D. marmorata) | EBO |
| Walnut | Juglans spp. | WAL |
Notes:
1. Sampling and Conformity (Clauses 2.1 & 1.3):
| Lot Size | Sample Count | Max Defective Allowed |
|---|---|---|
| 51–100 | 5 | 0 |
| 101–150 | 8 | 0 |
| 151–300 | 13 | 1 |
| 301–500 | 20 | 2 |
| 501–1,000 | 32 | 3 |
| Above 1,000 | 50 | 5 |
2. Timber Species (Clause 3.1):
3. Standards and References:
| Parameter | Specification |
|---|---|
| Overall dimensions | As per Fig. 1 |
| Dimensional tolerance | ±1 mm |
| Plywood thickness | 5 mm (Type BC WWR Grade) |
Notes:
This guarantees accurate sizing and material compliance.
1. Compliance through Random Sampling (Clause 2.1):
2. Timber Selection (Clause 3.1):
3. Design Notes:
This ensures structural integrity and longevity of the boxes.
1. Visual Inspection (Clause 1.2):
2. Sampling and Testing (Clause 1.3 & Table 1):
| Lot Size | Sample Count | Allowed Defects |
|---|---|---|
| 51–100 | 5 | 0 |
| 101–150 | 8 | 0 |
| 151–300 | 13 | 1 |
| 301–500 | 20 | 2 |
| 501–1,000 | 32 | 3 |
| Above 1,000 | 50 | 5 |
3. Dimensional and Manufacturing Compliance (Clause 1.3.2):
This rigorous approach maintains the high standards of workmanship and finish.
Sampling Size and Defect Limits (Table 1):
| Lot Size | Sample Count | Maximum Defectives Allowed |
|---|---|---|
| 51–100 | 5 | 0 |
| 101–150 | 8 | 0 |
| 151–300 | 13 | 1 |
| 301–500 | 20 | 2 |
| 501–1,000 | 32 | 3 |
| Over 1,000 | 50 | 5 |
Sampling Protocol:
Summary:
This method ensures unbiased quality verification.
Marking Details (Clauses 8.1 & 8.1.1):
Sampling and Acceptance (Clauses 1.3 & 2.1):
| Lot Quantity | Sample Size | Allowed Defective Units |
|---|---|---|
| 51–100 | 5 | 0 |
| 101–150 | 8 | 0 |
| 151–300 | 13 | 1 |
| 301–500 | 20 | 2 |
| 501–1,000 | 32 | 3 |
| Over 1,000 | 50 | 5 |
Packaging details are elaborated in Clause 8 of the standard; consult BIS regional offices for clarification.
Frame Timber Species (A-1):
| Common Name | Scientific Name | Code |
|---|---|---|
| Aini | Artocarpus hirsutus Lamk. | AIN |
| Amari | Amoora spp. | AMA |
| Badam | Terminalia procera | BAD |
| Banati | Lophopetalum wightianum Arn. | BAN |
| Benteak | Lagerstroemia lanceolata Wall. | BEN |
| Chaplash | Artocarpus chaplasha Roxb. | CHP |
| Chickrassy | Chukrasia tabularis A. Juss. | CHI |
| Chir | Pinus roxburghii Sargent | CHR |
| Cypress | Cupressus torulosa D. Don | CYP |
| Deodar | Cedrus deodara D. Don | DEO |
Slide Rack Timber Species (A-2):
| Common Name | Scientific Name | Code |
|---|---|---|
| Birch | Betula spp. | BIR |
| Bonsum | Phoebe spp. | BON |
| Boxwood | Buxus sempervirens Linn. | BOX |
| Champ | Michelia champaca | CHM |
| Ebony | Diospyros spp. (excluding D. marmorata) | EBO |
| Gamari | Gmelina arborea Roxb. | GAM |
| Haldu | Adina cordifolia (Roxb.) Hk. f. | HAL |
| Horse Chestnut | Aesculus indica Colebr. | HCH |
| Kaim | Mitragyna parvifolia (Roxb.) Korth. | KAI |
1. Sampling Size and Acceptance Limits (Table 1):
| Lot Size | Sample Count | Allowed Defectives |
|---|---|---|
| 51–100 | 5 | 0 |
| 101–150 | 8 | 0 |
| 151–300 | 13 | 1 |
| 301–500 | 20 | 2 |
| 501–1,000 | 32 | 3 |
| Over 1,000 | 50 | 5 |
2. Sampling Technique:
3. Testing on Samples:
Frequently Asked
According to IS 7850:1975, approved timber species for the wooden box frames and slide racks are listed in Appendix A of the standard. Only a single timber species should be used for each frame or slide rack. The timber chosen must be suitable for fine woodworking, offering durability and dimensional stability. Commonly used species include Sal (Shorea robusta), Teak (Tectona grandis), Deodar (Cedrus deodara), and Mango (Mangifera indica). Refer to Appendix A for the full official list and specifications.
IS 7850 specifies that the wooden box must have top and bottom panels made from 5 mm thick plywood of Type BC, WWR Grade as per IS 303-1975. The overall box dimensions must conform exactly to those indicated in Fig. 1 of the standard, with an allowable tolerance of ±1 mm. These requirements ensure the box provides a precise fit and adequate protection for microscope slides.
Per IS 7850, the box must be smoothly finished with a waterproof clear varnish applied to its exterior. Inside the lid, a paper index should be neatly affixed. Each box must be legibly and permanently marked with the manufacturer's name, initials, or trademark, along with the year of manufacture. Optionally, the box may bear the Standard Mark. All boxes undergo visual inspection to ensure workmanship quality and finish, with any defective boxes being rejected.
The standard requires that each wooden box contain two racks, each featuring 50 grooves to accommodate 100 slides in total. Each groove must be 2.7 mm wide to snugly hold standard microscope slides, evenly spaced and numbered from 1 to 100. The racks are secured inside a rectangular wooden box fitted with a hinged lid. Brass pins attach the top and bottom to the frame, and closure is ensured by two brass hooks engaging with eyes on the lid. A paper index numbered 1 through 100 is also pasted inside the lid to facilitate slide identification.
Sampling is performed randomly following the guidelines of IS 4905-1968 to maintain unbiased selection. The sample size and permissible number of defective boxes depend on the lot size as per Table 1 of the standard. For example, a lot of 51 to 100 boxes requires 5 samples with zero allowable defects, whereas lots over 1,000 require 50 samples with up to 5 defective units permitted. If the number of defective boxes in the sample exceeds the allowable limit, the entire lot is rejected. This procedure ensures consistent quality control and adherence to the standard.
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