Quality & Certifications
In House Lab testing, processing, and standards — specification compliance verified batch by batch.
ISO 9001:2015
| Issuing Body | International Certification Services |
|---|---|
| Scope | Manufacture & processing of silica sand and kaolin clay |
| Verification | Certificate copy provided on verified buyer inquiry |
Glass-Grade Silica Sand
Why each parameter matters for industrial buyers.
| Parameter | Specification | Why It Matters |
|---|---|---|
| SiO2 | ≥ 99% | Minimum purity threshold for glass and foundry grade. |
| Fe2O3 | 100–500 PPM | Iron drives colour defects in glass; lower is better. |
| Al2O3 | ≤ 0.30% | Controls viscosity in glass melt. |
| LOI | ≤ 0.45% | Residual organics affect kiln efficiency. |
What happens after you contact Stone Skipper?
SHARE YOUR REQUIREMENT
Application, specification, particle size, quantity and delivery location.
RECEIVE A SAMPLE
Get a 1 kg sample for testing before placing an order.
TEST & APPROVE
Evaluate the sample against your process and quality requirements.
GET YOUR QUOTE
Receive pricing based on your approved specification and quantity.
AGREE DELIVERY TERMS
Choose EXW, FOB or CIF, along with quantity and delivery schedule.
PLACE YOUR ORDER
We arrange supply as agreed, to the required quality and schedule.
Advanced Processing Capabilities
Multi-Stage Washing System
17+ minute washing cycle, designed to remove clay and iron impurities.
Flexible Drying Options
- Sun drying
- Industrial rotary dryer
Modern Quality Control Laboratory
Our QC lab maintains consistent quality standards across every batch.
Experienced Technical Team
Silica sand beneficiation experts supporting process and product quality.
Proven Expertise
High-end products developed according to customer requirements.
Standards Compliance
| Standard | Coverage |
|---|---|
| IS 488:1980 | Glass-grade silica sand (India). |
| IS 1987:2002 | Foundry-grade silica sand (India). |
| USGA | Standard silica sand for recreation and sports turf. |
Kaolin Quality Verified In-House
LOI, brightness (L-value), whiteness, firing temperature, shrinkage, and particle size distribution. SS-97 to SS-92 brightness grades available.
| Parameter | SS-97 | SS-95 | SS-94 | SS-92 |
|---|---|---|---|---|
| L-Value (Brightness) | 97.12 | 95.33 | 94.14 | 92.4 |
| Firing Whiteness | 92 | 90.5 | 90.1 | 89.9 |
| Al2O3 (%) | 36.99 | 36.48 | 35.68 | 35.1 |
| Fe2O3 (%) | 0.18 | 0.22 | 0.35 | 0.4 |
Lab Reports & Batch Certificates
NABL-accredited third-party lab reports and batch test certificates are available upon verified buyer inquiry.
Sourcing Silica Sand & Kaolin Clay for Industrial Use
Request our Technical Data Sheet and a sample quote. Response within 8 business hours.
Request Quotation
Trusted by Major Glass Industry Leaders
Saint-Gobain, Schott Glass, PGP Glass, Borosil, and Halydyn Glass trust us for specification-led supply.