The standard outlines the essential performance criteria and functional requirements for plastic window stays fabricated from polypropylene and fasteners made of nylon. It is designed for manufacturers and users of plastic window hardware, emphasizing durability, mechanical strength, and quality to provide cost-effective, low-maintenance alternatives to metal components in construction.
Overview
The standard outlines the essential performance criteria and functional requirements for plastic window stays fabricated from polypropylene and fasteners made of nylon. It is designed for manufacturers and users of plastic window hardware, emphasizing durability, mechanical strength, and quality to provide cost-effective, low-maintenance alternatives to metal components in construction.
Audience
Contents
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Frequently Asked
Per the standard specifications, polypropylene employed in window stays must possess the following characteristics:
| Property | Specification |
|---|---|
| Density | Between 0.900 and 0.910 g/ml |
| Tensile Strength at Yield | At least 315 kgf/cm² |
| Notched Impact Strength | Minimum of 3.7 kgf·cm |
| Water Absorption | Maximum 0.04% |
| Deflection Temperature | Not less than 54°C |
| Weather Resistance | Retain at least 50% of original elongation after exposure |
| Deformation Under Load | Maximum 6.0% at 50°C under 70 kg/cm² load |
These criteria ensure that polypropylene window stays deliver long-lasting mechanical performance and resist environmental degradation, making them a practical substitute for metal hardware.
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This ensures compliance with performance and durability requirements set by the standard.
The evaluation of strength for plastic window stays and fasteners is conducted through specific testing protocols that simulate real-world operational stresses:
These tests verify the components' ability to endure repetitive forces encountered during normal use. Successful completion qualifies the products for the ISI Certification Mark, ensuring adherence to quality standards.
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This method guarantees that plastic stays and fasteners maintain structural integrity and operational reliability.
According to the provisions in the standard, manufacturers may fabricate window stays and fasteners with dimensions or shapes that differ from the prescribed figures provided there is mutual agreement with the purchaser. This flexibility allows customization while maintaining quality. Key points include:
| Condition | Permissibility |
|---|---|
| As per standard figures | Allowed (standard) |
| Different sizes/shapes | Allowed if mutually agreed |
This ensures the option for tailored products while upholding functional and quality standards.
Each plastic window stay and fastener must carry clear markings to ensure traceability and compliance. Required markings include:
Additionally, products conforming to the standard may display the ISI Certification Mark, signifying official quality endorsement.
Packaging boxes should also be labeled with:
These markings provide transparency and assurance for users and regulators.
To ensure quality adherence, a statistical sampling and acceptance plan is implemented as follows:
| Lot Size | Sample Size | Maximum Allowed Defective Items |
|---|---|---|
| Up to 100 | 5 | 0 |
| 101 to 150 | 8 | 0 |
| 151 to 300 | 13 | 0 |
| 301 to 500 | 20 | 1 |
| 501 to 1,000 | 32 | 2 |
| Over 1,000 | 50 | 3 |
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This approach guarantees systematic quality control and compliance with the standard.
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