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There are many different types of resins and glues, and when you mix them wrong, the bond between them will be weak, or sometimes the glue will damage the object you want to fix. Read on to learn how to choose the right glue for your project, then follow the steps below to get the two things you need to stick together forever. If you need to glue pieces of plastic pipes, you can immediately jump to this section, which contains instructions on choosing the right adhesive for plastic pipes.
Steps
Choose the type of glue
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Look for products with the recycling symbol. Different plastics require different adhesives. The easiest way to distinguish plastic is to look for the recycling symbol on the product’s label or packaging. This symbol has the shape of a triangle with three sides of the arrows; inside or below the triangle with numbers, letters, or both. [1] X Research Source
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Learn how to stick the plastic numbered 6. The recycling symbol with the number 6 or PS indicates that it is “ppystyrene” plastic. This resin is best bonded with ppy glue (also known as plastic glue), or a specialized plastic glue such as Loctite Epoxy Plastic Binder or Super Glue Plastic Fusion. [2] X Source of Research Other adhesives that are also effective are cyanoacrylate glue (also known as “quick-drying glue”), or epoxy glue. [3] X Research Sources
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Choose a special glue for plastics labeled 2, 4 or 5. If your material is marked 2 , 4 , 5 , HDPE , LDPE , PP or UMHW , it is “ppyethylene” or “ppypropylene”. These resins are much more difficult to apply, and you must look for a glue that specifically states the name of the resin, for example Loctite Plastics Bonding System or Scotch Weld DP 8010.
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Select the correct glue for the 7 or 9 numbered resin. The number 7 composite or the 9 ABS can refer to many different types of plastic, and may include several other letters to separate them into smaller groups. . Ideally, you should choose epoxy or cyanoacrylate glue.
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Try to distinguish the type of plastic in another way. If there is no recycling symbol, you must guess the plastic type of the item before choosing a glue. Here’s a guide to help you complete the quest: [4] X Research Sources
- Lego bricks made from “ABS” plastic are best glued with epoxy glue. Solvent adhesives for ABS plastic can also be used, but may deform the surface of the material.
- Imitation glass, cheap toys, CD cases and similar brittle plastic items are often made from “ppystyrene” so can be glued with some sort of glue. For best results you should use ppy glue or glue that is advertised for use with plastic.
- For hard plastics such as bottles, crates, crates and food containers, you should use a glue that is specifically advertised as being able to stick “ppyethylene” and “ppypropylene” plastics. Most common glues cannot stick these products, so you should not assume that glue labeled “for plastics” is okay to use, unless it is clearly stated as “ppyethylene” or “ppypropylene”.
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Learn more if you want to glue the plastic to another material. If you want to glue plastic to wood, metal, glass, or even another type of plastic, you need to do more research. If you can’t find the answer online or can’t get help from a skilled craftsman, go to a hardware store to find a glue that you think will work after following the steps above. The packaging usually indicates what materials can be glued to the plastic.
- Visit This to That page for general advice on the type of glue to use to glue different materials. This advice is most useful for common plastics, especially ppystyrene.
- If you’re not sure if the glue you’ve chosen is correct, try using it to stick a piece of scrap material of the same material, or stick it to a hidden corner of the object to be glued on.
Sequence of gluing plastic
Wipe off the grease on the object to be pasted. Wash with soap, use a special plastic cleaner, or soak the item in isopropyl alcohol. [5] X Study Source[6] X Research Source Dry thoroughly.
- Then avoid touching the object with your bare hands to reduce oil residue.
Sand the surface to be glued. Pre-scrub the plastic surface with 120-200 grit sandpaper to create a bonding surface for the glue. Steel wool or an emery cloth will also work, but remember that you only need to lightly scrub.
Blend the two-component glue as needed. Two-component “epoxy” glue will need to blend to create stickiness. Read the instructions on the box carefully because there are many types of epoxy adhesives, and each requires its own mixing ratio. Some can be used for hours after mixing, while others need to be used within minutes.
- See Choosing a Glue for the type of glue to use. You can skip this step if you are not using two-component glue.
Apply glue to both surfaces. Use a small brush to apply an even layer of glue to the two surfaces to be glued. For very small objects like a broken part from a plastic model, you can use the tip of a needle.
- If using solvent glue ( not ppy glue), you should first clamp the two objects to be joined, then use the pump tube to sweep a line of glue along the edge between the two objects, then the glue will be sucked into the slot. gap between them. [7] X Source of Research If you are using solvent glue for plastic pipes, see the section Gluing plastic pipes.
Gently press the two objects together. Squeeze two objects together to hold them in place and remove air bubbles. Do not press so hard that the glue leaks out of the joint. If the glue leaks out, you need to wipe off the excess, unless you are using acrylic glue as it will evaporate on its own.
Hold the two objects completely fixed. Use clamps, vises, duct tape, or rubber bands to hold two objects together. Read the instructions on the container for the drying time of the glue. Depending on the type and brand of glue, bonds can form in minutes to 24 hours.
- Many resin glues continue to “grow in strength” for days or even weeks after application. Avoid applying pressure or heat to two glued objects for at least 24 hours after gluing, even if the two objects appear to be firmly bonded.
Sticking plastic pipes
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Identify the tube type. There are three types of plastic tubes and each can only be used with certain types of glue. The easiest way to tell the difference is to look for the recycling symbol on the tube, which is a triangle with three arrows on each side, with a number or letter in it to identify the type of plastic. Learn how to use this information or other ways to identify before choosing glue. [8] X Research Sources[9] X Research Sources[10] X Research Sources
- PVC pipes are commonly used in homes, although they should not be used as distribution pipes or in applications exposed to high temperatures. This type of pipe is usually white or gray in color if used in electrical or industrial applications. The recycling symbol for this type of pipe is 6 or PVC .
- CPVC pipes are PVC pipes that have been treated to withstand high temperatures. It has the same recycling symbol as PVC (6 or PVC) but is usually light yellow or cream in color.
- ABS is an older and more flexible style of plastic pipe, usually black in color. This type of pipe is not suitable for carrying drinking water, and in some jurisdictions it is prohibited by law to be used as a water pipe. The recycling symbol of the hose is 9 , ABS or 7 (other) .
- PEX is the newest style of plastic pipe and comes in a variety of colors. PEX pipes are not recyclable, cannot be glued, and you must use a mechanical connection tool to attach the hose.
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Select the type of adhesive. The material used to bond plastic pipes is called solvent glue . Find the right solvent glue to use after you distinguish the type of plastic pipe. [11] X Research Source
- ABS solvent glue is used to attach ABS pipes together. Solvent-adhesive PVC and CPVC are used to attach pipes made of the same resin.
- Intermediate solvent glue used to attach ABS pipes to PVC pipes. The striking green color of the glue makes it easy to identify.
- If you can’t find a specialized product, all-purpose solvent glue can also be used to join PVC, CPVC and ABS pipes together. First you should still distinguish the type of plastic pipe to rule out the possibility that it is a PEX pipe, which cannot be glued but can only be connected with a mechanical tool.
- Read the label on the glue to make sure the size of the tube you are using can be applied.
- To join a plastic pipe to a metal pipe, you may need to use a special glue that is used to combine the plastic with the metal, or you may need to connect it mechanically. Ask the staff at electrical and water stores and hardware stores for advice.
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Observe ventilation safety measures. Primers and solvents release toxic fumes when used. You should work in a well-ventilated area (open doors, windows, etc.) or wear a respirator to block organic chemical vapors.
File the inside flat if the tube is sawed. Insert a sheet of 80 grit sandpaper into the tube and rub the inside and outside of the tube where it needs to be glued. The goal is to eliminate rough spots and “sharp edges” caused by sawing, which can trap plastic chips and cause jams. [12] X Research Source
- Press the sandpaper to the shape of the tube face before sanding.
- If you don’t have sandpaper, use a file or tweezers to cut away any visible sharp edges.
Mark the coupling location if you are connecting a curved piece of pipe. If you don’t have much time to align the tube after applying the glue, it is recommended that you fit the two tubes together before applying the glue. Rotate the two bars to the required position and use a marker (non-erasable) draw a line across them.
Apply primer before gluing. Out of the three types of plastic pipes, PVC is the only material that requires a primer, but CPVC also adheres better with a backing. [13] X Research source[14] X Research source Apply PVC or CPVC primer (depending on the type of pipe used is PVC or CPVC) on the outside and inside at the location where the two pipes need to be connected. Let dry for 10 seconds before continuing.
Work quickly and neatly when applying solvent glue. Wearing gloves, use a makeup remover brush or cotton ball to apply an even layer of glue on the outside and inside of the two pipes to be connected. Apply only a thin and even layer to the area to be glued, otherwise the excess glue will be pushed into the water pipe and may cause blockage in the future. [15] X Research Source
Immediately connect the two hoses 1/4 turn from the desired position, then screw and hold. Immediately after applying solvent adhesive, connect the two tubes 1/4 turn from the marked position, then rotate the tube until the two marked positions match. If you don’t mark then simply match the two tubes and turn 1/4 turn. Hold for about 15 seconds to give the glue time to dry. [16] X Research Source
Adjust the length deviation by sawing to create space for the new pipe segment. The joint may shrink slightly as the solvent adhesive dries. If the last piece of pipe is too short, saw it off and lengthen it by gluing a new fitting in. If it’s too long, you can cut off one segment and connect the other two with a new joint.
Advice
- Silicone glue is useless against plastics unless it is used for cosmetic purposes only, it is not a solid bonding solution.
- If you accidentally drop acrylic glue on a plastic surface where it doesn’t need to be glued, you don’t need to wipe it off. The glue will evaporate on its own.
Warning
- Always apply in a well-ventilated place or wear a respirator.
Things you need
- 2 pieces of plastic
- sandpaper
- glue (see Choosing a glue type)
- small brush
- clamps, vises, duct tape or rubber bands.
For Plastic Pipe Paste:
- plastic pipe
- plastic pipe joints
- sandpaper
- PVC or CPVC primer (see instructions for details)
- solvent glue (see instructions for details)
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wikiHow is a “wiki” site, which means that many of the articles here are written by multiple authors. To create this article, 14 people, some of whom are anonymous, have edited and improved the article over time.
There are 10 references cited in this article that you can view at the bottom of the page.
This article has been viewed 11,072 times.
There are many different types of resins and glues, and when you mix them wrong, the bond between them will be weak, or sometimes the glue will damage the object you want to fix. Read on to learn how to choose the right glue for your project, then follow the steps below to get the two things you need to stick together forever. If you need to glue pieces of plastic pipes, you can immediately jump to this section, which contains instructions on choosing the right adhesive for plastic pipes.
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