Quotation for Oxygen Index Analyzer

Oxygen content oxygen index analyzerWorking conditions:
1. Environmental temperature: -10 ℃ -40 ℃.
2. Relative humidity: ≤ 85%.
3. Gas used: GB3863 Industrial Gaseous Oxygen; GB3864 Gaseous nitrogen for industrial use; Both bottles of gas require a pressure regulator (to be provided by the user).
4. Input pressure: (0.25-0.4) Mpa.
5. Work pressure: O.lMpa ± 0.01Mpa.

Oxygen content oxygen index analyzer

GB/T 5471-2008 Plastics - Compression molding of thermosetting plastic specimens (ISO 295:2004, IDT）

GB/T 9352-2008 Plastics - Compression molding of thermoplastic material specimens (ISO 293:2004, IDT）

GB/T 2828.1-2003 Sampling Procedures for Inspection by Attributes Part 1: Sampling Plans for Batch Inspection Searched by Acceptance Quality Limit (AQL) (ISO 2859-1:1989, IDT）

GB/T 11997-2008 Plastic Multipurpose Test Samples (ISO 3167:2002, IDT）

GB/T 17037.1-1997 Plastics - Preparation of Injection Molding Specimens for Thermoplastic Materials - Part 1: General Principles and Preparation of Multipurpose and Strip Specimens (idt ISO 294-1:1996)

GB/T 17037.3-2003 Plastics - Preparation of Injection Molding Test Specimens for Thermoplastic Materials - Part 3: Small Square Test Pieces (ISO 294-3:2002, IDT)

GB/T 17037.4-2003 Plastics - Preparation of Injection Molding Specimens for Thermoplastic Materials - Part 4: Determination of Molding Shrinkage (ISO 294-4:2001, IDT)

ISO 294-2:1996 Plastics - Injection molded specimens for thermoplastic materials - Part 2: Tensile strip specimens

ISO 294-5:2001 Plastics - Injection molded test specimens for thermoplastic materials - Part 5: Standard specimens for studying anisotropy

ISO 2818:1994 Preparation of test specimens by machining methods for plastics

ISO 2859-2:1985 Sampling and Inspection Procedures - Part 2: Sampling Plan for Limiting Mass (LQ) of Plastics for Interval Inspection

Compression molding of thermoplastic material specimens

1 Scope

This standard specifies the general principles and steps for preparing thermoplastic molded specimens and test pieces, which can be machined or stamped

The method is obtained from the test piece.

In order to obtain molded parts with repeatability, the main processing steps including four different cooling methods are standardized for each

The molding temperature and cooling method required for material and molding should be in accordance with the provisions of relevant international standards for materials or agreed upon by both parties with relevant interests.

Note that this method is not recommended for thermoplastic reinforcement materials.

2 Normative References

The provisions in the following documents become provisions of this standard by reference, and for any referenced document with a date, all subsequent provisions shall apply

The amendment form (excluding errata) or revised version is not applicable to this standard. However, all parties who have reached an agreement based on this standard are encouraged to study it

Can the latest versions of these files be used. The latest version of any referenced document without a date is applicable to this standard.

GB/T 3505-2000 Geometrical Product Specifications (GPS) - Surface Structure - Profile Method - Terminology, Definitions, and References for Surface Structure

Number (eqv ISO 4287; 1997)

ISO286-1 Product Geometric Specification (GPS) - ISO Limits and Coordination Systems - Part 1; Tolerances, deviations, and fittings

Heji Foundation (1988)

3 Terms and definitions

The following terms and definitions apply to this standard,

3.1

Molding temperature

The temperature of the mold or molding machine template measured in the area of the molding material during preheating and molding.

3.2

Demoulding temperature

At the end of cooling, the temperature of the mold or molding machine template measured in the area of the molding material,

Hanging, for non integral molds, holes can be drilled on the mold for the temperature specified in weak quantities 3.1 and 3.2,

3.3

Preheating time

Maintain contact pressure and heat the material inside the mold to the molding temperature for the required time.

3.4CB/T 9352--2008/15O 293:2004

3.6

Cooling rate

A constant cooling rate obtained by controlling the flow of cooling fluid within a specified temperature range, i.e. a cooling rate of at least every 10 minutes

The deviation between the rate and the specified cooling rate shall not exceed the specified tolerance.

Note that the cooling rate is usually expressed in ℃/h,

4 devices

4.1 Compression molding machine

The clamping force of the molding machine should be able to generate a molding pressure of at least 10MPa (usually given as the ratio of clamping force to mold cavity area).

During the entire molding process, pressure fluctuations should be controlled within 10% of the specified pressure.

The molded board should be able to:

a) Heat to at least 240 ℃;

b) Cool at the rate given in Table 1.

The temperature difference between any two points on the surface of the mold should not exceed ± 2 ℃ during heating and ± 4 ℃ during cooling.

When heating and cooling systems are installed in the mold, the same conditions should also be met.

Molded plates or molds can be heated using high-pressure steam or thermal fluid in appropriate piping systems, or heated using electric heating elements.

The molded plate or mold can be cooled using a thermal fluid (usually cold water) in a piping system,

Two molding machines are required for rapid cooling (method C in Table 1), one for molding heating and the other for cooling.

For the cooling method, the flow rate of the heat transfer fluid should be predetermined through experiments when there is no material inside the mold.

The molding machine can continuously control the temperature at the center position between the upper and lower templates,

4.2 Mold

4.2.1 Overview

The characteristics of samples prepared using different types of molds are different. Especially when mechanical properties are subjected to cooling and pressure is applied to the material

influence,

There are usually two types of molds used for molding thermoplastic specimens, namely overflow molds (see Figure 1) and non overflow molds (see Figure 2).

Figure 1 Hong Kong style ("frame") mold

Figure 2 Non overflow mold

Overflow type molds allow for excessive extrusion of molding material and do not apply molding pressure to the molding material during cooling. Preparation with similar thickness

Alternatively, low internal stress specimens or test pieces with comparability are particularly suitable for using overflow molds.

When using a non overflow mold, during the cooling period, all molding pressure (friction force ignored) is applied to the molding material. Obtained molding

The thickness, internal stress, and density of the component depend on the structure of the mold, the amount of material added, and the molding and cooling conditions. This type of mold can mold dense samples,

Molding time

The time to apply full pressure while maintaining the molding temperature.

3.5

Average cooling rate (non-linear) converting cooling rate (non-linear)

The rate of cooling with a constant flow of cold fluid. Calculation of average cooling rate: divide the difference between molding temperature and demolding temperature by the mold

The time required for cooling to demolding temperature.

Hanging, the average cooling rate is usually expressed in ℃/min.