1.The test tube without rim plain is a round bottom of the flat glass tube, tube melt light. Flat mouth, easy to sterilize and kill bacteria.
2. The test tube with rim plain is a round bottom glass tube with a curling edge (or round mouth). Curl mouth (or round mouth) is used to increase the mechanical strength, and easy to clamp and not easy to fall off.
3. Fermentation test tube It is a thin and short diameter (diameter 6mm, length 30mm) flat mouth, round bottom tube.
Sealing bottle mouth
Prevent the leakage of liquid or solid particles and the invasion of external impurities.
Clear scale
Excellent scale, durable, give you more accurate scientific data.
High borosilicate glass
Adopt high borosilicate glass, high temperature resistance, strong and durable.
Smooth surface
The surface of the bottle body is smooth, no protruding feeling, beautiful and generous.
Product Parameters
| BOROSILICATE GLASS | |
| BORO3.3 | |
| SiO2 Content | >80% |
| Strain Point | 520°C |
| Annealing Point | 560°C |
| Softening Point | 820°C |
| Refractive Index | 1.47 |
| Light Transmission(2mm) | 0.92 |
| Elastic Modulus | 67KNmm-2 |
| Tensile Strength | 40-120Nmm-2 |
| Glass stress Optical Coefficient | 3.8*10-6mm2/N |
| Processing Temperature(104dpas) | 1220°C |
| Linear Coefficient of Expansion(20-300°C) | 3.3*10-6K-1 |
| Density(20°C) | 2.23gcm-1 |
| Specific Heat | 0.9jg-1K-1 |
| Thermal Conductivity | 1.2Wm-1K-1 |
| Hydrolytic Resistance(ISO 719) | Grade 1 |
| Acid Resistance(ISO 185) | Grade 1 |
| Alkali Resistance(ISO 695) | Grade 2 |
| Thermal Shock Resistance Rod6*30mm | 300°C |