GB/T 13477.9-2017Test method for building sealants -- Part 9: Determination of adhesion/cohesion properties after immersion in water (English PDF)

Foreword

GB/T 13477 Test Method for Building Sealants is divided into 20 parts:

---Part 1: Specifications for Test Substrates;

---Part 2: Determination of Density;

---Part 3: Determination of Extrudability of Sealants Using Standardized Apparatus;

---Part 4: Determination of Extrudability of One-component Sealants;

---Part 5: Determination for Tack-free Time;

---Part 6: Determination of Flow;

---Part 7: Determination of Low-temperature Flexibility;

---Part 8: Determination of Tensile Properties;

---Part 9: Determination of Adhesion / Cohesion Properties after Immersion in Water;

---Part 10: Determination of Tensile Properties at Maintained Extension;

---Part 11: Determination of Tensile Properties at Maintained Extension after Immersion

in Water;

---Part 12: Determination of Adhesion / Cohesion Properties at Constant Temperature;

---Part 13: Determination of Adhesion / Cohesion Properties at Variable Temperatures;

---Part 14: Determination of Resistance to Prolonged Exposure to Water;

---Part 15: Determination of Adhesion / Cohesion Properties after Exposure to Heat and

Artificial Light through Glass and to Water;

---Part 16: Determination of Resistance to Compression;

---Part 17: Determination of Elastic Recovery;

---Part 18: Determination of Adhesion-in-peel;

---Part 19: Determination of Change in Mass and Volume;

---Part 20: Determination of Staining.

This is Part 9 of GB/T 13477.

This Part was drafted in accordance with the rules provided in GB/T 1.1-2009.

Test Method for Building Sealants - Part 9: Determination of

Adhesion / Cohesion Properties after Immersion in Water

1 Scope

This Part of GB/T 13477 specifies the method for the determination of adhesion / cohesion

properties of building sealants after immersion in water.

This Part is applicable to the determination of the influence of water immersion on the

elongation at break and the adhesion with substrates of plastic sealants. It can also be used to

determine the influence of water immersion on the adhesion / cohesion properties of elastic

sealants.

2 Normative References

The following documents are indispensable to the application of this document. In terms of

references with a specified date, only versions with a specified date are applicable to this

document. In terms of references without a specified date, the latest version (including all the

modifications) is applicable to this document.

GB/T 13477.1 Test Method for Building Sealants - Part 1: Specifications for Test Substrates

(GB/T 13477.1-2002, ISO 13640:1999, MOD)

GB/T 14682 Building Sealing Material Vocabulary (GB/T 14682-2006, ISO 6927:1981, NEQ)

3 Terms and Definitions

The terms and definitions defined in GB/T 14682 are applicable to this document.

4 Principle

Adhere the sealant specimen between the surfaces of two parallel substrates to prepare a test

piece. Immerse the test piece in water under specified conditions, then stretch the test piece to

failure, report the elongation at break of the test piece, and record the form of failure of the

sealant's adhesion or cohesion.

5 Standard Test Conditions

The standard test conditions of the laboratory are: temperature (23 ± 2) °C and relative humidity

(50 ± 5)%.

6 Test Apparatuses

7 Preparation of Test Piece

Use a degreasing gauze to remove floating dust from the surface of the cement mortar board.

Use solvents, for example, acetone, to clean the aluminum plate and glass plate, then dry them.

In accordance with the sealant manufacturer's instructions (for example, whether to use primer

and the mixing procedures for multi-component sealants), prepare the test pieces.

Maintain the sealant and substrate at (23 ± 2) °C. For each type of substrate and each test

temperature, prepare 3 test pieces.

As shown in Figure 1 and Figure 2, assemble two pieces of adhesion substrate and two pieces

of isolation pad on the anti-adhesive material to form a cavity. Then, embed the sealant

specimen in the cavity to prepare a test piece. When embedding specimens, the following

matters shall be noted:

a) Avoid the formation of air bubbles;

b) Squeeze the specimen onto the adhesion surface of the substrate to ensure a tight

9 Test Procedures

After performing the treatment in accordance with Method A or Method B, remove the pad.

Immerse the test piece in water (6.7) at (23 ± 2) °C for 4 days, then, place it under the standard

test conditions for 1 day. Put the test piece into the testing machine (6.4), at a speed of (5.5 ±

0.7) mm/min, stretch it to failure. Record the force value - elongation value curve and the failure

mode of the test piece.

10 Calculation of Test Results

The elongation at break E is calculated in accordance with Formula (1) and expressed as a

percentage. Take the arithmetic mean of 3 test pieces, accurate to 5%.

Where,

E---the elongation at break, expressed in (%);

W0---the initial width of the test piece, expressed in (mm);

W1---the width of the test piece at the time of failure, expressed in (mm).

......