Clothing safety assessment criteria
The degree of clothing health risk (classifying indicator) is calculated using a point-based system. The score is composed of three main parameters:
- User's age. The younger the child, the stricter the requirements. For example, newborns are assigned 0 points, while adolescents over 16 and adults receive 5 points.
- Duration of wear. Daily use for more than 4 hours is rated at 1 point, while rare wear (1–2 times a week up to 4 hours) is rated at 2 points.
- Skin contact area (percutaneous exposure). The highest degree of risk (1 point) is associated with items that contact the skin over an area of 15% or more. If the contact is less than 15%, the product receives 2 points; if there is no contact, 3 points.
Distribution of products by layers and classes
Clothing is divided into three layers, each with its own hygienic standards. Assignment of a class (from I to IV) depends on the layer, body contact area, age, and frequency of use.
- 1st layer (next-to-skin). Contacts the skin over more than 15% (or less). For newborns and children under 3 years old with daily wear, such items always belong to the strictest Class I.
- 2nd layer. Skin contact is limited (less than 15%). Items for newborns here receive Class I (daily) or Class II (episodic). For adults, this is Class III or IV.
- 3rd layer (outerwear). Has no direct skin contact. For toddlers, this is Class II or III; for adults, it is strictly Class IV.
Sanitary-chemical and physical properties
Material safety is confirmed by testing. The toxicity index (TI) must be within 70–120%.
The odor of the aqueous extract of materials must not exceed 1 point for Classes I–II (very weak, unnoticeable) and 2 points for Classes III–IV (weak).
Physical and hygienic properties depend on the product class:
| Class | Hygroscopicity (%) | Fabric air permeability (dm³/m²/s) | Electrificability (kV/m) |
|---|---|---|---|
| I | $\ge 14$ | $\ge 150$ | $\le 2$ |
| II | $\ge 10$ | $\ge 100$ | $\le 3$ |
| III | $\ge 4$ | $\ge 70$ | $\le 4,5$ |
| IV | Not regulated | Not regulated | $\le 7$ |
Footwear hygiene
Footwear is evaluated using similar criteria. It must be roomy, lightweight, and must not disrupt foot blood circulation or sweat evaporation.
The main requirements for footwear materials are good air permeability, sufficient softness, and protection against external influences (dampness, cold, injuries). Low thermal conductivity is critical for winter models.
Dangers of tight footwear:
- Local blood flow impairment due to compression of skin vessels.
- Rapid chilling and risk of foot frostbite in winter.
- Increased sweating, chafing, blisters, and foot deformations.
To remember the points for skin contact, use the rule "The more skin exposed, the lower the score": >15% = 1, <15% = 2, no contact = 3.
Class and exam questions
What does the clothing safety class depend on?
Based on the classifying indicator, which is calculated from the user's age, the product's skin contact area, and the frequency of its wear.
What requirements apply to Class I clothing?
These are the strictest requirements: hygroscopicity of at least 14%, high air permeability, electrificability up to 2 kV/m, and virtually complete absence of odor.
Which class does outerwear belong to?
Outerwear (3rd layer) does not contact the skin. Depending on age, it belongs to Classes II–IV.
What else to study on this topic
- Methodology for calculating body surface area proportions in children of different ages
- Specific sanitary-chemical migration indicators for different types of fabrics
- Methods for determining the toxicity index (TI)
- Differences in air permeability standards for knits and woven fabrics
- Organoleptic material evaluation (methodology for determining odor intensity)
Master the entire topic in the "Hygiene" course
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Other topics in "Chapter 9. Personal Hygiene and Healthy Lifestyle"
Prepared by WhiteCoat Pro faculty in accordance with the medical school curriculum. For educational purposes only.